CN1286609C - Tubular welding wire for gas protective arc welding - Google Patents

Abstract

The present invention provides a tubular welding wire for gas protective arc welding, which has the advantages of high welding performance and low sputtering amount of a solid welding wire and the advantages of stable welding, etc. of a tubular welding wire. The skin of the welding wire, which is made of steel, is filled with solder. The present invention is characterized in that corresponding to the metal wire with total mass, the present invention contains 0.3 to 1.8% of Si (mass percentage, the same below), 0.8 to 4.0% of Mn, 0.15 to 2.0% of one or two kinds of arc stabilizing agent containing the compound of Na2O and TiO2 or the compound of Na2O, SiO2 and TiO2, 0.02 to 0.15% of C, 0.02 to 0.3% of Ti and 0.001 to 0.01% of B; the solder filling ratio is 3 to 10% by mass.

Description

Tubular welding wire for gas protective arc welding

Technical field

The tubular welding wire for gas protective arc welding of the present invention relates to build, the various steel structures of welding such as bridge, shipbuilding being used can fully keep good conditions at the arc when relating between Gao Jinre, high channel the temperature welding, the good tubular welding wire for gas protective arc welding of various weld jobs such as few splashes.

Background technology

In the past, gas shielded arc welding connect with welding wire and can be divided into solid metal silk and flux cored wire.

According to different application targets, exploitation has multiple through adjusting the wire of component with solid gold bits silk in arc welding, and normally used is JIS Z3312 and other normalized product.Arc welding can be divided into two kinds again with flux cored wire, promptly, based on filling be referred to as slag system the slag component welding wire and be referred to as the welding wire of the metal component that metal is based on filling, exploitation has the multiple flux cored wire that adapts to various purposes, and has realized the normalization of JIS Z3313 and other standard.

Yet the solid metal silk is the metal welding wire, for further improving weld job, even want to make it to contain the arc stabilizer of trace, also can't realize.

On the other hand, flux cored wire then by to being filled in the improvement of the filling solder flux in the wire, can improve weld job, and weldability good metal silk majority has been realized practicability.This solder flux pack completeness wiry is basically all 10%～20%.The low pack completeness technical scheme wiry of seldom seeing pack completeness 5% is open, but in this flux component system, exists problems such as welding slag and armored concrete generation be too much, and present present situation is the low pack completeness wire of this a class practicability not as yet.The present situation of flux cored wire is that having of the weld job close with the solid metal silk is that the metal of major constituent is that flux cored wire has problems aspect arc stability and productivity with the metal powder.

As mentioned above, wish to develop a kind of this wire that makes the long thin footpath welding wire short, that gas shielded arc welding that drawn solid metal silk and flux cored wire both sides advantage connects usefulness that has is arranged.

Disclosed in the special public clear 51-1695 communique is that a kind of solder flux pack completeness is low, for example is filled with the flux cored wire of solder flux in welding wire sectional area rate 5～25% scopes.Though the solder flux of this invention has only 5% welding wire section rate, but the filling solder flux is as arc stabilizer, be to be essential component with graphite, form by Ti, Al, Mg etc., its match ratio is 2～10%, and comprise 20～90% deoxidiers, be a kind of wire that does not contain the filling solder flux of substantive metal oxide.Yet, the arc stabilizer that contains graphite because of in this graphite and the wire or the CO reaction that is attached between the oxygen on silk surface be to cause the unsettled principal element of electric arc, make the electric arc chap, weld job is poor, increases the generation that splashes.In addition, in weld metal, the ratio of C amount is excessive, is not easy to adjust the physical property of weld metal.

In the open flat 6-218577 communique of communique of Japan Patent, disclosed flux cored wire is that a kind of solder flux pack completeness is 5～30%, to the qualification that likened to of the content of Mn and S and Mn/S thereof, be filled with the solder flux that comprises the deoxidier that 40～60% iron powders, 40～60% are made up of Mn, Ti iron alloy powder.This is a kind of flux cored wire that belongs to metal system.When the wire of pack completeness 5%, 10% contains the filling solder flux of this metal powder in use, can not obtain fully stable electric arc, can't realize as the good weld job of flux cored wire and good welding effect thereof.

The content of invention

The object of the invention is, the tubular welding wire for gas protective arc welding of the stable advantages such as weld job of a kind of high weldability, low spatter generation and flux cored wire that has the solid metal silk concurrently is provided.

The present inventor comprises by the deoxidier that Si, Mn are formed and contains Na ₂O and TiO ₂Synthetic or contain Na ₂O, SiO ₂And TiO ₂The arc stabilizer of synthetic, the molten drop when promoting welding breaks away from, and makes the molten drop grain refined, increases the number of times of dividing a word with a hyphen at the end of a line, and has solved the problem of arc stabilityization.Welding efficiency at the flux cored wire existence is poor, the depth of weld is shallow and the problems such as generation is many of splashing, and solves by reducing solder flux pack completeness to 3～10%.So just found the extremely effective method of the brand-new arc welding of a kind of conduct, realized the present invention with flux cored wire.

The present invention relates to tubular welding wire for gas protective arc welding; be specifically related to a kind of wire at steel crust filling solder flux; the feature of this welding wire is; (1), comprises Si:0.3～1.8% (gross mass % wiry, following identical), Mn:0.8～4.0%, a kind or 2 kinds of Na that contain as arc stabilizer corresponding to the wire of gross mass ₂O and TiO ₂Synthetic or contain Na ₂O, SiO ₂And TiO ₂Synthetic: 0.15～2.0%, the solder flux pack completeness is 3～10 quality %.

(2) as the tubular welding wire for gas protective arc welding of above-mentioned (1) record, the filling solder flux is except containing Na ₂O and TiO ₂Synthetic or contain Na ₂O, SiO ₂And TiO ₂Synthetic outside, also contain with Na ₂O scaled value meter is at the Na below 0.3% ₂O source and/or with TiO ₂The scaled value meter is at the TiO below 1.5% ₂The source.

(3) as the flux cored wire of above-mentioned (1) record,, also contain C:0.02～0.15%, Ti:0.02～0.3%, B:0.001～0.01% corresponding to gross mass % wiry.

(4), corresponding to gross mass % wiry, also contain more than a kind or 2 kinds below the MO:0.7% as alloying agents, below the Ni:1.75%, below the Cr:1.0% as the flux cored wire of above-mentioned (3) record.

According to different needs, also can make in the filling solder flux and contain iron powder.

Can be made into no seam or jointed described tubular welding wire for gas protective arc welding on the steel crust again.

The above-mentioned gas shielded arc welding connects with flux cored wire and can use under steel crust copper coating or not copper-plated state.

The specific embodiment

The following describes the reason that flux cored wire component of the present invention etc. limits.

About Si:0.3～1.8% aspect, Si has the effect that reduces the oxygen amount in the weld metal as deoxidier.Corresponding to the wire of gross mass, when containing quantity not sufficient 0.3%, deoxidation power is insufficient, can produce bubble on the weld metal.In case exceed 1.8%, will increase molten, lose the effect of alleviating splash phenomena, and make the Si amount that inserts in the weld metal superfluous, thickization of crystalline solid and the toughness that reduces.When adding Si, no matter be a certain side or the both sides in steel crust or the filling solder flux, all can not influence its effect.

About Mn:0.8～4.0% aspect, Mn can promote the deoxidation of added metal, and improves the flowability of deposite metal, improves the shape of welding welding bead.Effectively utilize by the raw material in weld metal, can adjust the engineering properties of weld metal, have the effect that improves hot strength.For obtaining these effects, must add more than 0.8%.If surpass 4.0%, then molten drop increases, and loses the effect of alleviating splash phenomena, and can make the Mn amount in the added metal excessive, causes added metal intensity excessive, ftractures easily.When adding Mn, no matter be a certain side or the both sides in steel crust or the filling solder flux, all can not influence its effect.

Can under the state of ferroalloys such as metal Si, metal M n or Fe-Si, Fe-Si-Mn, Fe-Mn, in the filling solder flux, add Si.Si, Mn scaled value separately is exactly the content in the filling solder flux.

Corresponding to gross mass % wiry, no matter the addition of Si and Mn but when adding Si and Mn, is a certain side or the both sides in crust or the filling solder flux as mentioned above, all can not influence its effect, it is very big that deoxidation power during welding and the raw material effective rate of utilization in the weld metal can difference yet.But, if in crust, added more Si or Mn, the crust resistance ratio is increased, the wire feed rate during welding is faster than the occasion of adding in the filling solder flux.When in the steel crust, containing Si and Mn, preferably make following restriction.

That is, Si is to be advisable below 1.2%.Its reason is to surpass 1.2% if the Si that adds in crust measures relative crust weight, because of increasing or add, hardness hardens easily man-hour, and poor in processability, difficulty is shaped.And add and break easily man-hour stretching line, reduce the material effective rate of utilization.Therefore, for guaranteeing productivity, the Si amount in the crust is preferably in below 1.2%.

Mn is to be advisable below 2.5%.Its reason is to surpass 2.5% if the Mn that adds in crust measures relative crust weight, and then hardness increases or adds and hardens easily man-hour, poor in processability, and the difficulty that is shaped, and add and break reduction material effective rate of utilization man-hour easily stretching line.Therefore, for guaranteeing productivity, the Mn amount in the crust is preferably in below 2.5%.

The content that Si and Mn add up to is to be advisable below 3%.Its reason is if the relative crust weight with Mn total amount of Si of adding in crust surpasses 3.0%, and then hardness increases or adds and hardens easily man-hour, poor in processability, and the difficulty that is shaped, and when stretching line, break easily, obviously reduce the material effective rate of utilization.Therefore, for guaranteeing productivity, Si in the crust and Mn total amount are preferably in below 3.0%.

The following describes the addition and the effect thereof of stabilizing agent.

About containing Na more than a kind or 2 kinds ₂O and TiO ₂Synthetic, contain Na ₂O, SiO ₂And TiO ₂Synthetic: 0.15%～2.0% aspect, when less than 0.15%, the same with the welding of solid metal silk, molten drop increases, and makes the skew of size increase the conditions at the arc instability, the generation that splashes increases, and can not improve the above-mentioned weld job of solid metal silk.Otherwise if surpass 2.0%, then arc length can exceed Len req, and the result increases the generation that splashes, and the armored concrete generation is increased.Be controlled at 0.15～2.0% o'clock, the conditions at the arc in the welding are very good, and molten drop is little, and the generation that splashes is few.

As containing Na ₂O and TiO ₂Synthetic or also contain SiO ₂The three-component system synthetic, even with Na ₂O and TiO ₂The ratio synthetic of making various variations also can obtain same effect, they all are included in the technical conceive of the present invention.Contain Na ₂O and TiO ₂The synthetic typical example be sodium titanate (mNa ₂OnTiO ₂), for example, this synthetic can be by mixing NaOH and rutile after high-temperature process obtains in required ratio.Preferably according to Na ₂O is 10～50%, TiO ₂Be that the interior ratio of 50～90% scopes is made synthetic.Containing SiO ₂The time, SiO ₂To be advisable below 30%.For example, can list with 13Na ₂O-80TiO ₂, 20Na ₂O-73TiO ₂, 42Na ₂O-53TiO ₂, Na ₂O-TiO ₂, Na ₂O-3TiO ₂, Na ₂O-6TiO ₂Or 13Na ₂O-25SiO ₂-58TiO ₂Be synthetic of key component etc., but be not limited thereto Na ₂O and TiO ₂Ratio can do any adjustment.In addition, 13Na ₂O-25SiO ₂-58TiO ₂(metatitanic acid sodium metasilicate) etc. contains SiO ₂The slag fluidity of synthetic bigger than sodium titanate, can cover the welding bead surface equably, it is good to make welding bead form property.

The following describes in arc stabilizer with Na ₂O scaled value meter adds the Na below 0.3% ₂The reason in O source.This Na ₂O is a kind of Na of containing ₂O and TiO ₂Synthetic or contain Na ₂O, SiO ₂And TiO ₂Synthetic beyond additive, the change of arc length in can reducing to weld has the molten drop of the increasing number of times of dividing a word with a hyphen at the end of a line, and, promotes the effect of molten grain refined that is.Yet, if surpass 0.3%, can reduce the molten drop number of times of dividing a word with a hyphen at the end of a line, have the tendency that arc length is increased, the result makes to splash to send out amount and increase.As Na ₂Sodium carbonate, soda-lime glass etc. can be adopted in the O source.

The following describes TiO ₂Addition is in the reason below 1.5%.This TiO ₂Be a kind of Na of containing ₂O and TiO ₂Synthetic or contain Na ₂O, SiO ₂And TiO ₂Synthetic beyond additive, as arc stabilizer, produce area by the electric arc that enlarges at the molten drop front end, it is stable that molten drop is divided a word with a hyphen at the end of a line, and has the downward electromagnetism of promotion and pinch the effect that contracts.If surpass 1.5%, it is excessive then can to make downward electromagnetism pinch the effect that contracts, and makes the molten drop instability of dividing a word with a hyphen at the end of a line, and can make the material effective rate of utilization surplus to the recovery Ti of weld metal amount again, influences the performance of weld metal.As TiO ₂Rutile, high titanium slag, ilmenite etc. can be adopted in the source.

The purpose of adding iron powder in the filling solder flux is to improve speed of welding and/or adjusts pack completeness etc.Best addition is the wire corresponding to gross mass, makes iron content below 5%.This iron component is as the iron component of the raw-material ferroalloy of the Si of deoxidier and Mn and the aggregate value of iron powder.Because what be added on that Si in the filling solder flux and Mn source use is metal Si, metal M n or Si-Mn alloy, therefore, also can use because of add the iron component forfeiture that Si and Mn cause in the filling solder flux.

More than be to constitute solvent of the present invention, the same with common tubular welding wire for gas protective arc welding, the purpose that contains deoxidiers such as Al, Mg, Zr is, prevents to produce bubble and/or be used to adjust engineering properties because of the weld metal deoxidation is not enough.Yet if the content surplus, the slag fissility that the welding slag sintering is caused is bad, welding bead bad order or weld metal intensity are excessive, reduces resistance to cracking.In addition, deoxidier is except playing a role as the alloying constituent with material effective rate of utilization in weld metal, also can form slag after the oxidation, composition and growing amount thereof to the fusing slag also exert an influence, influence purpose of the present invention and effect sometimes, therefore, preferably suitably limit kind and content.

The present invention is its purpose in the engineering properties with the adjustment weld metal, can be in the scope that does not influence the basic technical conceive of the present invention, in as filling solder flux of metal wire for welding that is suitable for welded steel or steel crust, add C, Ti and B, perhaps add the alloy compositions of Mo, Ni, Cr more than a kind or 2 kinds as required, slag removers such as Bi, S etc.If consider that from production efficiency these alloy compositions preferably are added in the filling solder flux.

That is,,, also very big with tough sexual intercourse because of C adjusts one of most important element of weld metal intensity for strengthening to melt admittedly if add C:0.02～0.15%.Therefore, if the addition less than 0.02% of C when then temperature is welded between Gao Jinre, high channel, can not be guaranteed required intensity.Addition surpasses at 0.15% o'clock, and the tissue of weld metal forms formation of martensite, and intensity is excessive, and toughness is also poor, and the generation that splashes is increased, and weld job is poor.

If add Ti:0.02～0.3%,, be the requisite element that is used to improve weld metal intensity and toughness because of Ti has the effect of organizing miniaturization that makes weld metal.Therefore, during welding between Gao Jinre of the present invention, high channel under the temperature, if Ti addition less than 0.02%, then tissue can not miniaturization, can not guarantee required toughness.Surpass at 0.3% o'clock at addition, because of the intensity that has improved weld metal reduces toughness, intensity is also excessive.

If add B:0.01～0.01%, because of B is a kind of and Ti adds requisite element with the high tenacity that obtains weld metal simultaneously, therefore, add Ti and B simultaneously, if B addition less than 0.001% (10ppm) then can not form micro organization, can not improve toughness.When addition surpasses 0.01% (100ppm), weld metal hardness is risen cause intensity excessive, cause the toughness deterioration.

If add the Mo below 0.7%, Mo is that a kind of weld metal that makes is organized miniaturization, advanced the important element that can guarantee intensity when welding under the temperature between heat and high channel at height.But superfluous interpolation can cause that the intensity of weld metal is excessive, makes the toughness deterioration, therefore, will on be defined as 0.7%.

If the Ni of interpolation below 1.75%, Ni have by the solid molten effect that makes weld metal intensity improve, also can improve rotproofness and toughness of strengthening.Interpolation above 1.75% can make intensity excessive, becomes the reason of high temperature cracking.

If add the Cr below 1.0%, the same with Mo, because of Cr is a kind of important element that can guarantee intensity between Gao Jinre, high channel during the welding under the temperature, the effect with hear resistance, rotproofness and the weatherability that can improve weld metal.Surpass 1.0% interpolation and can cause weld metal intensity too high, reduce toughness, therefore, will on be defined as 1.0%.

According to the different engineering properties of weld metal, in order to improve physics value, these Mo, Ni, Cr alloy compositions can independent or compound interpolations.In the scope that processability allows, consider the effective rate of utilization of material, if in the component of steel crust, contain these alloy compositions, can obtain same purpose and effect.

Fig. 3 (a) and Fig. 3 (b) expression tubulose welding of the present invention section shape.Fig. 3 (a) be with filling solder flux 2 vibra-packs in the tubular steel crust 1 of steel, contract then through making monofilament, stretch the specified diameter that line is processed into 0.8～2.0mm again.In addition, in band steel forming process, be configured as U font, filling solder flux, O font successively; then; weld, contract, be processed into welding wire through the hyperextension line then, can be manufactured on jointless tubular welding wire for gas protective arc welding on the steel crust thus through making monofilament.Because of on this steel crust, not having seam, thus can moisture absorption from the moisture of atmosphere, can obtain good weld metal performance.

The welding wire of filling solder flux 2 is in band steel forming process in the steel crust 1 with seam 3 shown in Fig. 3 (b), is configured as U font, filling solder flux, O font successively, then, contracts through making monofilament, stretches line processing then.Because the pack completeness of this welding wire is lower, therefore enlarged the contact area of crust seam, strengthen the barrier effect of filling solder flux and atmosphere, few moisture absorption from the moisture of atmosphere.The seam shape of steel crust is not limited to diagram, and also R-joining can further improve the barrier effect with outer gas.

By copper facing on steel crust surface, can improve the rust-preventing characteristic on crust surface, can improve welding wire property sent to and energising property again.In addition, then can be in wire surface at suitable coated antirust agent of wire surface and lubricant, to guarantee rust-preventing characteristic and the wire property sent to without the welding wire of electroplating.

The pack completeness of the filling solder flux of flux cored wire of the present invention is decided to be 3～10%.If pack completeness less than 3% then is difficult to carry out solder flux filling and shaping, productivity is poor.Pack completeness surpasses at 10% o'clock, will increase the slag generation and the generation that splashes, and can not improve performance wiry, makes stretching linear difference and cause broken string when making welding wire, and productivity is poor.Be further to improve productivity, eutectic scorification and operation, pack completeness preferably 3.5～7.0%.

Current density when welding for improving, to obtain high welding rate, the diameter of flux cored wire of the present invention is 0.8～2.0mm preferably.Make the low pack completeness of solder flux carefully behind welding wire, can enlarge the welding current scope, for example when using the welding wire of 1.2mm diameter, can reach 120～550A, can increase substantially operating efficiency.

Sealing gas when using the arc welding of flux cored wire of the present invention has used CO ₂, can obtain sufficient weld job, but consider from weld job environment aspect, also can use the Ar-CO that the armored concrete generation is reduced ₂Mist.

The following describes the Production Example of tubular welding wire for gas protective arc welding of the present invention.

The manufacture method of flux cored wire of the present invention be adopt a kind of on the steel crust jointless wire, the pipe line of steel is configured on the vibrating device with coiled type, after the filling solder flux carried out vibra-pack, through contracting, stretch the finished product that line is processed into the specified diameter with 0.8～2.0mm again through making monofilament.Another kind of manufacture method be with band steel in forming process, be configured as U font, filling solder flux, O font successively, tube shape is made in welding then, passes through and contracts through making monofilament, stretches line again and is processed into welding wire.

For the welding wire that on the steel crust, has seam, its manufacture method be with the band steel in forming process, form U font, filling solder flux, O font successively, through contracting through making monofilament, then, stretch line and be processed into welding wire then.Stretching in the line procedures process of these manufacture methods, to carry out annealing operation usually.

For understanding fully the performance of flux cored wire of the present invention, prepare in advance with deoxidier Si:0.5%, Mn:1.5% be matrix, as the Na of arc stabilizer ₂O and TiO ₂Synthetic (the 13Na that constitutes ₂O-80TiO ₂) content is respectively 5 kinds of filling solder flux within the scope of the present invention of 0.15%, 0.5%, 1.0%, 1.3%, 1.8%, and the content of above-mentioned synthetic is set at 0%, 0.05% the filling solder flux that does not reach scope of the invention lower limit and surpasses 4 kinds of filling solder flux of 2.2%, 3.0% of the scope of the invention upper limit.Requirement according to solder flux pack completeness 5%, above-mentioned solder flux is filled in the pipe (chemical constituent C:0.05%, Si:0.01%, Mn:0.30%, P:0.01%, S:0.01%) that the crust wire W shown in the table 1 is P1, stretching line, to be machined to external diameter be 1.2mm, as the test flux cored wire.At welding current: 300A, arc voltage: 33V, speed of welding: 30cm/min, electrode extension: 20mm, sealing gas: weld with this welding wire under the welding condition of carbon dioxide, flow: 25L/min, observe the generation that the molten drop in the welding is divided a word with a hyphen at the end of a line number of times and splashed.

Divide a word with a hyphen at the end of a line aspect the number of times observing molten drop, photographed in the welding position, its result is carried out slow regeneration, molten drop is taken place to carry out number of times mensuration until disengaging as 1 cycle at the welding wire front end while weld with high-speed motion picture camera automatically.The photography conditions of welding position is a photography width of cloth number: 1000 width of cloth/seconds, shutter speed: 1/3000 second, its result is reseted at a slow speed, molten drop produced until breaking away from as 1 cycle at the welding wire front end carry out number of times and timing, obtain standard deviation, Fig. 1 represents this investigation result.

As shown in Figure 1, the filling solder flux in use contains the scope of the invention (contains Na ₂O and TiO ₂Synthetic: during 0.15～2.0%) flux cored wire, the molten drop number of times of dividing a word with a hyphen at the end of a line is more than 40 times/second, divides a word with a hyphen at the end of a line the cycle from molten drop, and its standard deviation is below 7, and the result is good.But, will contain above-mentioned Na in use ₂O and TiO ₂Synthetic when being set at the welding wire that is lower than scope of the invention lower limit, its result is bad, the molten drop number of times of dividing a word with a hyphen at the end of a line reduces, the divide a word with a hyphen at the end of a line standard deviation in cycle of molten drop is big.In addition, be set at welding wire above the scope of the invention upper limit and be too the molten drop number of times of dividing a word with a hyphen at the end of a line and reduce, the divide a word with a hyphen at the end of a line standard deviation in cycle of molten drop is big.

When generation is splashed in observation, carry out welding automatically in 1 minute continuously, its mean value is calculated in the collection of splashing that produces during 1 root bead silk is carried out welding for 3 times.

Fig. 2 represents to observe the result of generation of splashing.As shown in Figure 2, when the content of synthetic was in the scope of the invention (0.15～2.0%), the generation that splashes was less, and below 1g/min, the result is good.But, when use is set at the comparative example welding wire that is lower than scope of the invention lower limit, contain above-mentioned Na ₂O and TiO ₂The synthetic effect bad, the generation that splashes increases.In addition, when use is set at comparative example welding wire above the scope of the invention upper limit, can excessively promote the ionization in the electric arc environment, increase the length of electric arc, so make the molten drop instability of dividing a word with a hyphen at the end of a line, the result is the increase generation that splashes.

As can be seen from the above results, if contain Na ₂O and TiO ₂Or Na ₂O, SiO ₂And TiO ₂Synthetic in a kind or 2 kinds be in (0.15～2.0%) in the scope of the invention, then molten drop is few, can stablize and divide a word with a hyphen at the end of a line, the generation that splashes is few.But when making the comparative example welding wire of test with the solder flux that does not meet scope of the invention lower limit and higher limit, molten drop is big, divides a word with a hyphen at the end of a line under unsure state, and splashing amount increases.

(embodiment 1)

Below embodiment and comparative example are done the generality explanation.

Table 1 is depicted as the component of the flexible metallic hose and the band steel thereof of the present invention and comparative example employing thereof.Jointless welding wire has adopted crust in the table 1 to be labeled as the flexible metallic hose of P1 on the steel crust, jointed welding wire uses on the steel crust is the steel band that crust in the table 1 is labeled as H, behind the solder flux that filling is made up of table 2, through rolling and drawing-die stretch line, softening and dehydrogenation is handled and is carried out intermediate annealing, except welding wire 8,9,22 and 23, implement electroplating processes, be formed in that jointless wire diameter is the flux cored wire of 1.27mm on the steel crust.

Table 1

The crust mark	The crust form	C	Si	Mn	P	S
							P1	Pipe	0.05	0.01	0.30	0.010	0.010
P2	Pipe	0.035	1.18	0.20	0.020	0.015
							P3	Pipe	0.01	0.02	2.41	0.015	0.008
H1	The band steel	0.04	0.01	0.25	0.010	0.010
							H2	The band steel	0.033	0.50	1.00	0.022	0.007
H3	The band steel	0.02	0.72	2.15	0.010	0.014

Table 2

Invention is distinguished	The wire mark	The wire form	Electroless plating is arranged	Pack completeness (%)	Filling flux component (gross mass % wiry)
														Si	Mn	By Na 2O and TiO 2The synthetic of forming		Na 2O	TiO 2	Iron		Other
					Raw material	Content	Iron powder	The iron component of alloy
									Example of the present invention	W1	No seam	Have	3			0.4	1.0			13Na 2O-80TiO 2	1.00		-	-	-	0.34	Surplus branch
W2	No seam	Have	3	0.3	0.8	13Na 2O-80TiO 2	0.17	-						-	1.4			-	Surplus branch
										W3	No seam	Have	7.5			0.8	1.9			13Na 2O-80TiO 2	1.5	-	-	2.4	0.69	Surplus branch
W4	No seam	Have	4.5	0.5	1.5	13Na 2O-80TiO 2	1.0	0.22						-	-			1.04	Surplus branch
										W5	No seam	Have	5			0.5	1.5			13Na 2O-80TiO 2	1.0	-	0.75	-	1.04	Surplus branch
W6	No seam	Have	6	0.7	1.8	13Na 2O-80TiO 2	1.3	0.18						0.99	-			0.59	Surplus branch
										W7	No seam	Have	7			1.0	2.0			13Na 2O-80TiO 2	1.0	0.23	1.10	0.4	0.90	Surplus branch
W8	Seam is arranged	Do not have	6	0.7	1.8	13Na 2O-80TiO 2	1.0	0.23						1.30	-			0.59	Surplus branch
										W9	No seam	Do not have	6			0.7	1.8			13Na 2O-80TiO 2	1.0	0.25	1.30	-	0.59	Surplus branch
W10	No seam	Have	5	0.7	1.8	20Na 2O-73TiO 2	1.0	-						-	0.7			0.59	Surplus branch
										W11	No seam	Have	5			0.7	1.8			42Na 2O-53TiO 2	1.0	-	0.20	0.5	0.59	Surplus branch
W12	No seam	Have	5	0.7	1.8	13Na 2O-58TiO 2-25SiO 2	1.0	-						-	0.7			0.59	Surplus branch
										W13	No seam	Have	6			0.7	1.8			13Na 2O-58TiO 2-25SiO 2	0.7	0.17	0.32	1.4	0.59	Surplus branch
W14	No seam	Have	7	0.8	2.5	13Na 2O-80TiO 2	0.6	0.13						1.10	-			1.70	Surplus branch
										Comparative example	W15	No seam	Have			4	0.3			0.9	-	-	-	0.08	2.0	0.48	Surplus branch
W16	No seam	Have	2	0.2	1.0	13Na 2O-80TiO 2	0.1	0.03	-					-	0.52			Surplus branch
											W17	No seam	Have			11	0.8		1.9	13Na 2O-80TiO 2	1.5	0.35	1.80	2.5	0.71	Surplus branch
W18	No seam	Have	7	1.9	1.7	13Na 2O-80TiO 2	0.9	-	0.20					0.4	1.44			Surplus branch
											W19	No seam	Have			6	0.7		1.8	13Na 2O-80TiO 2	2.2	0.23	0.05	-	0.59	Surplus branch
W20	No seam	Have	6	0.5	0.6	13Na 2O-80TiO 2	1.0	0.23	0.20					2.5	0.48			Surplus branch
											W21	No seam	Have			7	0.8		1.9	13Na 2O-80TiO 2	0.9	0.48	1.30	-	0.48	Surplus branch
W22	No seam	Have	7.2	0.5	4.0	13Na 2O-80TiO 2	0.6	0.22	-					-	0.99			Surplus branch
											W23	No seam	Have			6	0.7		1.8	13Na 2O-58TiO 2-25SiO 2	2.2	0.33	0.03	-	0.59	Surplus branch
W24	Seam is arranged	Do not have	6	0.7	1.8	13Na 2O-58TiO 2-25SiO 2	2.2	0.23	0.20					-	0.59			Surplus branch
											W25	No seam	Do not have			6	0.6		1.3	-	-	0.30	2.00	1.0	0.52	Surplus branch
W26	Solid	Have	-	0.6	1.3	-	-	-	-					-	-			Surplus branch
											W27	Solid	Have			-	0.7		1.6	-	-	-	(0.22 containing Mo and Ti)	-	-	-
W28	No seam	Have	15	1.0	2.0	13Na 2O-80TiO 2	1.5	0.07	6.00					2.0	0.90			Surplus branch

Remarks: (1) Si and Mn comprise Fe-Si:48, Fe-Si:21-Mn:62, Fe-Mn:75, the calculated value of (only at W4,5,12,13,14,15,22 in use) alloy

(2) other component: surplus branch comprises the solid shape part of waterglass, the foreign material in microcomponent (C.P.S) raw material etc.

(3) W1 in the waterglass, 2,3,5,10,11,12,13,15,18 is silicate, other adopts sodium metasilicate.

W1～W14 shown in the table 2 is embodiment.W15 is later on a comparative example.

The present invention's example shown in the table 2 and the welding condition of comparative example are welding currents: 300A, arc voltage: 33V, speed of welding: 30cm/min, electrode extension: 20mm, flow of carbon dioxide gas amount: 25L/min.Observation splash generation, molten drop divide a word with a hyphen at the end of a line number of times, molten drop the divide a word with a hyphen at the end of a line standard deviation and the slag state in cycle.For the generation that splashes, carry out welding in 1 minute, collect the splashing amount that takes place in this welding, 1 root bead silk is carried out 3 times, calculate collecting amount mean value.

For molten drop the divide a word with a hyphen at the end of a line standard deviation in cycle of number of times and molten drop of dividing a word with a hyphen at the end of a line, with high-speed motion picture camera the arc phenomenon in the welding to be photographed, the molten drop of instrumentation between 1 second divide a word with a hyphen at the end of a line number of times, the straight warp of molten drop and electric arc width carry out 3 times 1 root bead silk, calculate its mean value.For the slag state, the method that adopts visual and little hammer to knock is investigated slag generation and the fissility thereof that generates on the welding bead surface after the welding.Make tension test sheet (Z2201 A1 number) and impact test sheet (No. 4, Z2242) according to JIS Z3111, measure the mechanical performance of weld metal.

Table 3 is the result of soldering test.

Table 3

Invention is distinguished	The wire mark	Conditions at the arc		Generation (g/min) splashes	State		Overall merit
								The molten drop number of times (number of times/second) of dividing a word with a hyphen at the end of a line	The divide a word with a hyphen at the end of a line standard deviation in cycle of molten drop	Generation (annotating 1)	Fissility (annotating 2)
		Example of the present invention	W1		47	5.0						0.55	Seldom	Bad slightly	Well
W2	41			6.0			0.95	Seldom	Bad slightly	Well
			W3		42	4.9					0.80	Few	Well	Well
W4	45			6.2			0.78	Few	Well	Well
			W5		44	5.5					0.75	Few	Well	Well
W6	45			4.7			0.61	Few	Well	Well
			W7		41	6.8					0.52	Few	Well	Well
W8	44			6.6			0.58	Many slightly	Well	Well
			W9		43	6.6					0.54	Many slightly	Well	Well
W10	45			4.6			0.61	Few	Well	Well
			W11		46	4.8					0.57	Few	Well	Well
W12	46			4.5			0.80	Few	Well	Well
			W13		47	6.5					0.75	Few	Well	Well
W14	44			4.3			0.51	Few	Well	Well
			Comparative example		W15	26					12.2	1.80	Few	Bad	Bad
W16	27	10.5		1.53			Few	Bad slightly	Bad
					W17	37				11.4	1.31	Many	Bad slightly	Bad
W18	45	6.2		0.66			Few	Bad slightly	Bad
					W19	33				10.1	1.40	Few	Bad slightly	Bad
W20	40	8.8		0.99			Few	Bad slightly	Bad
					W21	33				14.5	1.85	Few	Bad slightly	Bad
W22	40	7.1		0.65			Many slightly	Bad	Bad
					W23	33				12.2	1.39	Few	Bad slightly	Bad
W24	35	12.0		1.40			Few	Bad slightly	Bad
					W25	25				7.9	1.44	Many	Well	Bad
W26	18	16.0		2.30			-	-	Bad slightly
					W27	22				14.7	1.90	Few ※	Bad slightly	Bad slightly
W28	24	7.7		1.34			Many	Well	Bad slightly

Annotate 1: the slag generation is few more good more, and "-" expression does not almost have the metal covering of slag, and " ※ " is illustrated in the metal covering of no slag on the whole welding bead.

Annotate 2: the slag fissility: well represent to beat easily with conelet and peel off, bad slightly expression is not beaten and can be peeled off with bradawl, bad expression sintering state.

Welding wire of the present invention shown in W1～W14 is divided a word with a hyphen at the end of a line all well aspect the standard deviation in cycle at divide a word with a hyphen at the end of a line number of times and molten drop of molten drop, can carry out stable welding, and the result is that the generation that splashes is few.Though more more slightly than solid metal silk at the slag that the welding bead surface generates, generation is few, on the welding bead surface, generate the uniform thin layer of globality, and, aspect its fissility,, obtained good result if beat gently and can peel off easily with hammer.

Otherwise the W15～W28 of comparative example and the present invention's example have relatively then produced problem, and effect is bad, sees for details as follows.

W15 is not because of comprising Na ₂O and TiO ₂Synthetic, so arc stability is not good, operation is also relatively poor, the molten drop number of times of dividing a word with a hyphen at the end of a line is reduced to 26 times/second, the generation that splashes does not reduce.

The pack completeness less than 2% of W16 can not the needed solder flux of filling, and Si is because of being lower than lower limit of the present invention, so can not obtain the deoxidation effect in the weld metal, the welding bead part on weld metal has produced bubble.As arc stabilizer, because of Na ₂O and TiO ₂Synthetic be lower than lower limit of the present invention, so reduced the effect of arc stabilizer, the molten drop number of times of dividing a word with a hyphen at the end of a line reduces, the divide a word with a hyphen at the end of a line standard deviation value in cycle of molten drop is big, conditions at the arc instability, result are that the generation that splashes also increases.

The pack completeness of W17 is increased to 11%, as arc stabilizer, though added Na ₂O and TiO ₂Synthetic, but the effect of arc stabilizer is excessive, arc length surpasses required length, the standard deviation value in cycle is big so the molten drop instability of dividing a word with a hyphen at the end of a line, molten drop are divided a word with a hyphen at the end of a line, the conditions at the arc instability, the result is that the generation that splashes is also many, does not run off traditional wire scope.In addition, TiO ₂Increase, the slag amount is too much, and operation is poor.

Though W18 as arc stabilizer, used in the scope of the invention by Na ₂O and TiO ₂The synthetic that constitutes has obtained stable electric arc, but the Si amount is high, and the Si of weld metal increases, poor mechanical properties.

Among the W19 as arc stabilizer used contain Na ₂O and TiO ₂Synthetic exceeded the scope of the invention, pretend to the effect of arc stabilizer excessive, arc length surpasses Len req, can not stablize and carry out molten drop and divide a word with a hyphen at the end of a line, the divide a word with a hyphen at the end of a line standard deviation value in cycle of molten drop is big, and conditions at the arc instability, result are that the generation that splashes also increases.

The Mn content of W20 is few, and weld metal deoxidation deficiency has bubble slightly, the mechanicalness undercapacity.

W21 is because of Na ₂O surpasses the scope of the invention, pretends to the effect of arc stabilizer excessive, and arc length surpasses Len req, can not stablize to carry out molten drop and divide a word with a hyphen at the end of a line, and conditions at the arc instability, result are that the generation that splashes also increases.

W22 has surpassed the scope of the invention because of Mn, comprises Na so no longer include ₂O and TiO ₂The effect of synthetic, molten drop increases, the generation that splashes increases, the Mn amount of weld metal increases, aspect engineering properties, hot strength is big, impact flexibility is little.

Though having added, W23 comprises Na ₂O, TiO ₂And SiO ₂Synthetic, but the effect of arc stabilizer is excessive, arc length surpasses Len req, the molten drop instability of dividing a word with a hyphen at the end of a line, and the divide a word with a hyphen at the end of a line standard deviation value in cycle of molten drop is big, the conditions at the arc instability, the generation that splashes also increases.

The welding wire shape of W24 has seam, not through plating, but the same with W23, by Na ₂O, TiO ₂And SiO ₂The synthetic addition of forming is many, and the effect of arc stabilizer is excessive, and arc length surpasses Len req, and the instability so molten drop is divided a word with a hyphen at the end of a line, conditions at the arc instability, result are that the generation that splashes also increases.

W25 is owing to the Na that does not contain as arc stabilizer ₂O, TiO ₂And SiO ₂, therefore, the molten drop number of times of dividing a word with a hyphen at the end of a line is few, and electric arc is unstable all the time, and the generation that splashes increases.

W26 is the solid metal silk of a kind of JIS YGW12, and W27 is the solid metal silk of a kind of JIS YGW11 and since do not contain as arc stabilizer by Na ₂O and TiO ₂The synthetic of forming, therefore, the molten drop number of times of dividing a word with a hyphen at the end of a line is few, and conditions at the arc are unstable more, can not reduce the generation that splashes.

W28 is pipe six welding wires of traditional pack completeness, though contain by Na ₂O and TiO ₂The synthetic of forming, but TiO ₂Amount is many, and the slag generation is many, and the molten drop number of times of dividing a word with a hyphen at the end of a line is few, and conditions at the arc are unstable more, can not reduce the generation that splashes.

(embodiment 2)

With embodiment the welding wire that the component of mild steel band, the steel band of crust changes is described below.Adopt pipe and the steel band shown in the table 1, with pipe shown in the table 4 and steel band combination, the filling solder flux has adopted manufacture method, welding method and the assay method identical with the welding wire shown in the aforementioned table 2.

Table 5 expression welding result.

Table 4

Invention is distinguished	The wire mark	The crust mark	The wire form	Electroless plating is arranged	Pack completeness (%)	Filling flux component (all-metal yarn quality %)
															Si	Mn	By Na 2O and TiO 2The synthetic of forming		Na 2O	TiO 2	Iron		Other
						Raw material	Content	Iron powder	The iron component of alloy
										The present invention	WP1	P2	No seam	Have			3	-			1.0	13Na 2O-80TiO 2		1.00	-	-	0.60	0.25	Surplus branch
WP2	P3	No seam	Have	4	1.4	0.3	42Na 2O-53TiO 2	0.60	0.17						0.75	1.25			0.28	Surplus branch
											WP3	P3	No seam	Do not have			4	1.0			-	13Na 2O-80TiO 2	1.30	-	0.80	-	0.52	Surplus branch
WH1	H2	No seam	Do not have	4	-	-	13Na 2O-80TiO 2	1.00	0.25						1.30	1.10			-	Surplus branch
											WH2	H3	No seam	Have			4	0.3			0.5	13Na 2O-80TiO 2	1.00	-	0.70	1.00	0.28	Surplus branch
WH3	H3	No seam	Have	4	0.3	0.5	42Na 2O-53TiO 2	1.00	-						0.70	1.00			0.28	Surplus branch
											WH4	H3	No seam	Have			5.5	0.3			0.5	42Na 2O-53TiO 2	1.00	0.17	1.40	1.30	0.35	Surplus branch
Comparative example	WP4	P2	No seam	Have	4.5	1.0	1.5	13Na 2O-80TiO 2	0.90						-	-			-	0.90									Surplus branch
										WH5	H3	No seam	Have	6			-	2.3			13Na 2O-80TiO 2	1.00	0.35	1.30	-	0.58	Surplus branch

Table 5

Invention is distinguished	The wire mark	Conditions at the arc		Generation (g/min) splashes	State		Overall merit
								The molten drop number of times (number of times/second) of dividing a word with a hyphen at the end of a line	The divide a word with a hyphen at the end of a line standard deviation in cycle of molten drop	Generation (annotating 1)	Fissility (annotating 2)
		The present invention	WP1		42	6.3						0.65	Seldom	Bad slightly	Well
WP2	41			5.5			0.78	Few	Well	Well
			WP3		45	6.0					0.66	Few	Well	Well
WH1	46			6.7			0.61	Many slightly	Well	Well
			WH2		43	5.8					0.68	Few	Well	Well
WH3	45			5.3			0.75	Few	Well	Well
			WH4		42	6.5					0.81	Many slightly	Well	Well
Comparative example	WP4			32			10.5	1.85	Few	Bad					Bad
		WH5	30		11.2	2.02					Many slightly	Bad slightly	Bad

Annotate 1: the slag generation is few more good more, and "-" expression does not almost have the metal covering of slag, and " ※ " is illustrated in the metal covering of no slag on the whole welding bead.

Annotate 2: the slag fissility: well represent to beat easily with conelet and peel off, bad slightly expression is not beaten and can be peeled off with bradawl, bad expression sintering state.

Welding wire of the present invention shown in WP1～WP3 and the WH1～WH4 is divided a word with a hyphen at the end of a line all well aspect the standard deviation in cycle at divide a word with a hyphen at the end of a line number of times and molten drop of molten drop, can carry out stable welding, and the result is that the generation that splashes is few.

More more slightly at the slag that the welding bead surface generates than solid metal silk, but generation is few, can generate very thin one deck on whole welding bead surface equably, and, aspect fissility,, can peel off easily as long as beat gently with awl, can obtain good result.

Otherwise the WP4 of comparative example and WH5 are then bad, compare with example of the present invention, exist problem, see for details as follows.

WP4 surpasses the scope of the invention because the Si amount in the welding wire is 2.13% corresponding to gross mass wiry, and therefore, molten drop is big, and the divide a word with a hyphen at the end of a line standard deviation value in cycle of molten drop is big, and conditions at the arc instability, result are that the generation that splashes also increases.In addition, the Si amount in the added metal is superfluous, poor mechanical properties.

WH5 surpasses the scope of the invention because the Mn amount in the welding wire is 4.32% corresponding to gross mass wiry, and therefore, molten drop is big, and the molten drop number of times of dividing a word with a hyphen at the end of a line is few, and the divide a word with a hyphen at the end of a line standard deviation value in cycle of molten drop is big, and conditions at the arc instability, result are that the generation that splashes also increases.

(embodiment 3)

The jointless welding wire that the present invention and comparative example are used has used the P1 shown in the table 6,2,3 with the component of flexible metallic hose, and jointed welding wire has used the H shown in the table 6 with the band steel ₁, H ₂, H ₃Behind the solder flux that filling is made up of table 7, stretch line, softening and intermediate annealing that dehydrogenation is handled through rolling and drawing-die, except wire W7, W8, W14～W16 and W26～W29, all implement electroplating processes, be formed in the flux cored wire of no seam on the steel crust or jointed wire diameter 1.2mm.

Table 6

Mark	Chemical constituent quality %
						C	Si	Mn	P	S
	P1	0.05	0.01	0.30	0.020						0.015
P2						0.04	1.18	0.20	0.030	0.020
	P3	0.01	0.02	2.41	0.010						0.030
H1						0.04	0.01	0.25	0.015	0.020
	H2	0.04	0.50	1.00	0.200						0.015
H3						0.02	0.72	2.15	0.025	0.020

Table 7

Invention is distinguished	The wire mark	Steel crust mark	Have or not seam	Electroless plating is arranged	Pack completeness (%)	Complex chemical compound, metal oxide, gross mass % wiry				Metal component gross mass %ceq. wiry
																								Comprise Na 2O and TiO 2Synthetic		Na 2The O scaled value	TiO 2Scaled value	C	Si	Mn	Cu	Ti	B(ppm)	Mo	Ni	Cr	N(ppm)	Ceq.	Iron		Other
						Raw material	Content	Iron powder	The iron component of alloyed iron
										Example of the present invention	W1	P1	Do not have	Have	7.0	13Na 2O-80TiO 2	0.60	-	0.10	0.05	0.76	1.85	0.20	0.18	35																		44	0.67	2.4	0.82	Surplus branch
W2	P1	Do not have	Have	6.5	13Na 2O-80TiO 2	0.70	-	-	0.05																	0.59	1.86	0.20	0.23	35				50	0.70	1.5	0.72	Surplus branch
											W3	P1	Do not have	Have	6.0	13Na 2O-80TiO 2	0.40	0.10	-	0.05	0.79	1.88	0.20	0.30	55														0.20			56	0.91	1.2	0.82	Surplus branch
W4	P1	Do not have	Have	6.0	13Na 2O-80TiO 2	0.50	-	0.06	0.05																	0.67	1.68	0.20	0.25	45	0.18			39	0.77	0.4	1.05	Surplus branch
											W5	P1	Do not have	Have	5.5	13Na 2O-80TiO 2	0.60	-	0.07	0.06	0.77	2.05	0.20	0.17	40																	42	0.71	0.2	0.80	Surplus branch
W6	P1	Do not have	Have	4.5	13Na 2O-80TiO 2	0.80	-	-	0.06																	0.73	1.25	0.20	0.25	35	0.20			35	0.68	0.3	0.51	Surplus branch
											W7	H1	Have	Do not have	6.0	13Na 2O-80TiO 2	0.30	-	0.50	0.04	0.88	1.58		0.24	55														0.10	0.60		56	0.83	0.7	0.86	Surplus branch
W8	P1	Do not have	Do not have	6.0	13Na 2O-80TiO 2	0.70	-	0.50	0.05																	0.77	1.55		0.26	45	0.10		0.30	51	0.80	0.7	0.72	Surplus branch
											W9	P1	Do not have	Have	10.0	13Na 2O- 26SiO 2-80TiO 2	0.70	0.10	0.60	0.05	1.33	2.28	0.20	0.22	34														0.10			48	0.80	2.6	1.22	Surplus branch
W10	P1	Do not have	Have	3.5	13Na 2O-80TiO 2	0.15	0.25	-	0.11																	0.32	0.85	0.20	0.03	20	0.20			45	0.44	0.6	0.55	Surplus branch
											W11	P1	Do not have	Have	7.5	13Na 2O-80TiO 2	0.20	-	1.00	0.07	0.52	1.55	0.20	0.12	45															1.35		40	0.69	0.9	1.22	Surplus branch
W12	P2	Do not have	Have	4.0	43Na 2O-52TiO 2	0.15	-	-	0.04																	1.05	1.23	0.20	0.24	65			0.05	45	0.82	0.5	0.62	Surplus branch
											W13	P3	Do not have	Have	5.5	43Na 2O-52TiO 2	0.15	-	0.18	0.02	0.41	2.44	0.20	0.08	45																0.40	55	0.70	1.0	0.55	Surplus branch
W14	H1	Have	Do not have	6.0	43Na 2O-52TiO 2	0.30	0.30	0.40	0.04																	0.64	1.36		0.27	35			0.80	44	0.75	0.6	0.75	Surplus branch
											W15	H2	Have	Do not have	3.5	43Na 2O-52TiO 2	0.15	-	-	0.04	0.59	0.94		0.10	85														0.15			29	0.74	0.4	0.34	Surplus branch
W16	H3	Have	Do not have	8.5	13Na 2O-80TiO 2	1.80	-	-	0.02																	0.88	2.42		0.05	10	0.05			29	0.46	1.8	1.00	Surplus branch
											Comparative example	W17	P1	Do not have	Have	4.5	13Na 2O-80TiO 2	0.10	-	-	0.04	1.34	1.93	0.20	0.34														60				35	0.94	0.3	0.30	Surplus branch
W18	P3	Do not have	Have	7.0	13Na 2O-80TiO 2	0.90	0.50	0.50	0.01	0.77																2.41	0.20	0.08	20	0.20			28	0.55	0.8	0.67	Surplus branch
												W19	P1	Do not have	Have	8.0	13Na 2O-80TiO 2	2.05	-	-	0.05	0.25	3.05	0.20	0.18													65	0.20			48	0.94	0.5	1.63	Surplus branch
W20	P1	Do not have	Have	7.0	-	-	0.39	-	0.05	1.96																1.04	0.20	0.22	55		1.10		33	0.83		0.93	Surplus branch
												W21	P1	Do not have	Have	6.5	-	-	-	1.68	0.05	1.45	0.76	0.20	0.16													65			0.66	45	0.82	0.5	0.78	Surplus branch
W22	P1	Do not have	Have	2.5	13Na 2O-80TiO 2	1.15	-	0.20	0.05	0.41																0.92	0.20	0.01	25				51	0.38	0.3	0.20	Surplus branch
												W23	P1	Do not have	Have	12.0	13Na 2O-80TiO 2	0.50	-	0.50	0.04	0.88	4.05	0.20	0.18													25	0.25	0.30		52	0.89	3.2	0.58	Surplus branch
W24	P1	Do not have	Have	4.0	13Na 2O-80TiO 2	0.06	0.30	-	0.16	0.47																0.98	0.20	0.15	15		0.10		42	0.55	0.5	0.74	Surplus branch
												W25	P2	Do not have	Have	7.5	13Na 2O-80TiO 2	0.80	0.03	0.03	0.04	1.19	2.36	0.20	0.16													5				62	0.60	1.3	0.66	Surplus branch
W26	H1	Have	Do not have	5.5	43Na 2O-52TiO 2	0.60	-	-	0.04	0.99																1.65		0.06	110	0.20		0.15	35	0.96	0.6	1.03	Surplus branch
												W27	H2	Have	Do not have	9.5	13Na 2O-80TiO 2	1.50	-	0.05	0.04	0.85	1.82		0.18													35	0.75			51	0.77	1.4	0.98	Surplus branch
W28	H3	Have	Do not have	7.5	-	-	-	0.25	0.05	0.85																1.95		0.15	65		1.79		45	0.87	1.7	0.67	Surplus branch
												W29	H1	Have	Do not have	7.0	13Na 2O-80TiO 2	0.06	0.05	0.06	0.05	0.58	1.78		0.09													65			1.08	53	0.85	2.1	0.90	Surplus branch
W30	Solid		Have	-	-	-	-	-	0.06	0.70																1.48	0.20	0.20	50	0.20			32	0.74			Surplus branch

Annotate the aggregate value that 1:C, Si and Mn represent steel crust and filling solder flux metal component, Cu represents the value of plating amount.

2: "-" of each component or empty forms are shown in not have in the filling solder flux and mix.

3: surplus branch is represented adhesive SiO ₂Wait other indispensable component.

Wire W1～W16 shown in the table 7 is embodiments of the invention, and wire W17～W30 is a comparative example.

Use the steel plate (B1, B2) of component shown in the table 8, with welding current 400A, arc voltage 40V, speed of welding 24cm/min, advance heat 40KJ, interchannel temperature below 350 ℃ as welding condition, on the groove shape shown in the table 9 (K1, K2), weld, implemented the weld metal performance test.In addition, generation, molten drop divide a word with a hyphen at the end of a line standard deviation, the slag state of number of times, the mensuration of the depth of weld of number of times, molten drop of dividing a word with a hyphen at the end of a line that splash is to use the test film of the thickness of slab 20mm of the steel plate B1 shown in the table 8, width 60mm, length 400mm, welds under above-mentioned welding condition.

The generation that splashes is to connect welding 1 minute, and 1 one metal wire is carried out the collection operation of splashing that takes place for 3 times in its welding, calculates the mean value of this collecting amount (g/min).The generation that splashes is advisable below 1.0g/min with collecting amount.

Divide a word with a hyphen at the end of a line aspect the standard deviation in cycle at divide a word with a hyphen at the end of a line number of times, molten drop of the molten drop of arc welding, with high-speed motion picture camera the arc phenomenon in the welding is photographed, the number of times of dividing a word with a hyphen at the end of a line of the molten drop during the instrumentation per second carries out 3 times 1 one metal wire, calculates its mean value.Molten drop is divided a word with a hyphen at the end of a line number of times to be advisable more than 40 times/second.

At the slag state aspect, observe the slag growing amount that the welding back generates with visual means on the welding welding bead, beat with bradawl and adjust fissility.

The depth of weld is to have carried out the welding of down hill welding road, should weld the welding bead vertical direction cuts off, this section is observed the fusion penetration state after grinding, corroding, instrumentation, is estimated 3 results' of instrumentation mean value to the distance of welding between the foot from the steel plate upper surface as fusion penetration.The degree of depth of welding is to be advisable more than the 6mm.

The engineering properties of weld metal is to make tension test sheet (JIS Z2201 A1 number) and impact test sheet (No. 4, JIS Z2242) is tested.490～the 590N/mm of hot strength when adopting steel plate B1 ², 520～620N/mm during steel plate B2 ²Be advisable, impact value is advisable more than with 47J in the time of 0 ℃.

Table 10 is the evaluation result of The experiment results and weld job thereof.

Table 8

Mark	Chemical constituent quality %					The JIS specification
							C	Si	Mn	P	S
	B1	0.17	0.44	1.32	0.014							0.004	SM490B
B2						0.19	0.49	1.52	0.022	0.005	SM520B

Table 9

Mark	Thickness of slab (mm)	The weld bond shape	The weld bond angle (°)	Route interval (mm)
					K1	19	V-arrangement	22.5	12
K2	25	L shaped	35	12

Table 10

Invention is distinguished	The wire mark	Weld bond	Steel plate mark	The character of machinery					Have or not cracking (having or not)	Fusion penetration	Weld job					Overall merit
																	0.2% endurance (N/mm 2)	Hot strength (N/mm 2)	Percentage elongation (%)	Absorb energy		Generation splashes	Conditions at the arc		The slag state
				(2VE、J)		(molten drop is divided a word with a hyphen at the end of a line number of times/second)	Standard deviation	Growing amount			Fissility
												-20℃	0℃	(mm)	(g/min)
				Example of the present invention	W1					K1										B1	443	524	28.4	76	98	Do not have	7.4	0.78	44	8.4	Few	Well	Well
W2	K1	B1	454			544	29.2	87	112		Do not have	7.5	0.88	41	7.3	Few	Well	Well
					W3					K1									B1	501	582	28.5	42	78	Do not have	7.5	0.76	40	7.4	Few	Well	Well
W4	K1	B1	458			550	27.3	57	91		Do not have	7.6	0.84	44	8.2	Few	Well	Well
					W5					K1									B1	435	536	26.8	66	95	Do not have	7.6	0.86	43	7.6	Few	Well	Well
W6	K1	B1	455			541	28.2	42	61		Do not have	7.8	0.76	45	8.5	Few	Well	Well
					W7					K1									B1	478	570	29	69	101	Do not have	7.5	0.75	41	7.5	Few	Well	Well
W8	K1	B1	455			562	28	54	87		Do not have	7.6	0.81	44	7.8	Few	Well	Well
					W9					K1									B1	473	557	28.9	45	68	Do not have	7.3	0.69	46	7.6	Few	Well	Well
W10	K1	B1	436			512	26.8	39	55		Do not have	8.0	0.72	41	7.2	Considerably less	Well	Well
					W11					K1									B1	442	529	29.4	86	105	Do not have	7.6	0.81	43	7.5	Few	Well	Well
W12	K1	B1	493			570	28.6	57	93		Do not have	7.9	0.76	41	8.6	Considerably less	Well	Well
					W13					K1									B2	480	551	28.1	72	108	Do not have	7.7	0.91	42	8.4	Few	Well	Well
W14	K1	B2	459			567	29.5	63	101		Do not have	7.6	0.90	41	8.1	Few	Well	Well
					W15					K2									B2	504	595	28.2	84	104	Do not have	8.1	0.66	47	7.1	Considerably less	Well	Well
W16	K2	B2	436			533	28.7	57	75		Do not have	7.4	0.85	42	7.9	Few	Well	Well
					Comparative example					W17									K1	B1	515	612	26.1	29	44	Do not have	7.6	1.45	36	10.4	Few	Well	Bad
W18	K1	B1	421	485		29.2	96	115	Do not have		7.5	1.36	43	8.9	Few	Well	Bad
										W19								K1	B1	445	526	12.8	41	62	Do not have	7.4	1.25	42	8.1	Few	Well	Bad
W20	K1	B1	474	583		27.5	23	40	Do not have		7.5	1.23	45	9.2	Few	Well	Bad
										W21								K1	B1	418	486	29.3	46	55	Do not have	7.5	1.26	42	9.9	Few	Well	Bad
W22	K1	B1	488	585		26.7	27	41	Do not have		8.1	1.18	40	9.7	Considerably less	Well	Bad
										W23								K1	B1	495	607	26.9	58	74	The weld bond cracking	6.1	1.45	45	7.7	Many	Difference	Bad
W24	K1	B1	508	609		26.7	31	44	Do not have		7.7	1.19	40	9.1	Few	Well	Bad
										W25								K1	B1	438	533	29.4	20	41	Do not have	7.4	0.68	45	7.2	Few	Well	Bad
W26	K1	B1	511	606		25.8	34	43	Do not have		7.5	0.68	43	7.2	Few	Well	Bad
										W27								K1	B1	491	607	25.6	18	39	Do not have	7.1	0.66	44	8.6	Few	Well	Bad
W28	K2	B2	522	631		24.3	82	108	The weld bond cracking		7.6	0.55	47	7.2	Few	Well	Bad
										W29								K2	B2	538	643	24.9	22	40	Do not have	7.4	0.67	44	8.6	Few	Well	Bad
W30	K1	B1	471	552		29.6	54	88	Do not have		8.3	1.43	25	12.3	Considerably less	Well	Bad

Welding wire of the present invention shown in wire W1～W16 is divided a word with a hyphen at the end of a line all well aspect the standard deviation in cycle at divide a word with a hyphen at the end of a line number of times and molten drop of molten drop, can carry out stable welding, and the result is that the generation that splashes is few.And the slag that generates on the welding bead surface is more more slightly than solid metal silk, but growing amount own is few, can generate very thin one deck on whole welding bead surface equably.Aspect fissility, as long as beat gently, can strip off easily with awl, can obtain good result.Aspect fusion penetration, also dark than traditional flux cored wire, can obtain and the silky degree of depth of solid metal, there is not weld defect, the result is very good.And hot strength and toughness also can obtain good result, can fully meet the demands.

Otherwise the wire W17～W30 of comparative example compares with example of the present invention, exists problem, sees for details as follows.

Wire W17 is because of the Na that contains as arc stabilizer ₂O and TiO ₂Synthetic less, therefore, splashing amount is many, the molten drop of the welding number of times of dividing a word with a hyphen at the end of a line is also few, the divide a word with a hyphen at the end of a line standard deviation value in cycle of molten drop is also big, conditions at the arc are also unstable.Again because of Ti is many, so hot strength is big, poor toughness.

Wire W18 is because of the Na as arc stabilizer ₂The Na in O source ₂The O scaled value is bigger, so arc length increases, splashing amount is many, again because of C is few, so hot strength is little.

Wire W19 is because of the Na that contains as arc stabilizer ₂O and TiO ₂Synthetic more, so arc length increases, splashing amount is many, again because of Si is few, so produce bubble on weld metal, the extensibility during tension test is poor.

Wire W20 is because of Na ₂The Na in O source ₂The O scaled value is bigger, so arc length increases, splashing amount is many, again because of Si is many, so poor toughness.

Wire W21 is because of TiO ₂The TiO in source ₂Scaled value is bigger, so the arc length elongation, splashing amount is many, and again because of Mn is few, so the flowability of weld metal is poor, welding bead bad order, hot strength are also poor.

Wire W22 is little because of the solder flux pack completeness, so the welding wire productivity is bad, the solder flux pack completeness is inhomogeneous, the electric arc instability, and the generation that splashes is many, again because of Ti is few, so poor toughness.

Wire W23 is big because of the solder flux pack completeness, so the slag growing amount and the generation that splashes are many, the slag fissility is poor, and the depth of weld is also shallow, again because of Mn is many, so hot strength is big, and high temperature occurs at welded junction part and ftractures.

Wire W24 is many because of C, so the splashing amount generation is many, hot strength is big, poor toughness.

Wire W25 is few because of B, so poor toughness.

Wire W26 is many because of B, and W27 is many because of Mo, and W29 is many because of Cr, thus all be that hot strength is big, poor toughness.

Wire W28 is many because of Ni, so hot strength is big, and, the high temperature cracking appears at welded junction part.

Wire W30 is a kind of solid metal silk, compares with example of the present invention, and the conditions at the arc instability, the generation that splashes is many, and divide a word with a hyphen at the end of a line number of times and the standard deviation value in cycle of dividing a word with a hyphen at the end of a line of molten drop is all big.

In sum; the feature of tubular welding wire for gas protective arc welding of the present invention is; electric arc is extremely stable; molten drop is divided a word with a hyphen at the end of a line often, and grain refined is divided a word with a hyphen at the end of a line, and it is few to splash; on the basis of the advantage that traditional solid metal silk and flux cored wire are had, increase again; weld job and welding weld bead shape thereof are good, add easily and adjust alloy compositions, can make contributions to the high efficiency of the weld job of high-qualityization of welding position, high welding efficiency and different thickness of slab, material.

Simple declaration to accompanying drawing

Fig. 1 represents to contain Na in the filling solder flux ₂O and TiO ₂Synthetic to molten drop number of times and the molten drop influence that the standard deviation in cycle produces of dividing a word with a hyphen at the end of a line of dividing a word with a hyphen at the end of a line.

Fig. 2 represents to contain Na in the filling solder flux ₂O and TiO ₂Synthetic influence that the generation that splashes is produced.

Fig. 3 is the section of tubular welding wire for gas protective arc welding of the present invention, (a) is that profile schema diagram, (b) of no seam welding wire is the profile schema diagram that the seam welding wire is arranged.

Explanation to symbol among the figure

1 expression steel crust, 2 expression solder flux, 3 expression seams.

Claims (4)

1. tubular welding wire for gas protective arc welding; described flux cored wire be a kind of in the steel crust welding wire of filling solder flux; it is characterized in that,, comprise Si:0.3～1.8%, Mn:0.8～4.0%, a kind or 2 kinds of Na that contain as arc stabilizer corresponding to the wire of gross mass ₂O and TiO ₂Synthetic or contain Na ₂O, SiO ₂And TiO ₂Synthetic: 0.15～2.0%, the solder flux pack completeness is 3～10 quality %, above percentage accounts for the percentage of wire gross mass for each composition, wherein, the described Na that contains ₂O and TiO ₂Synthetic be sodium titanate and/or the described Na that contains ₂O, SiO ₂And TiO ₂Synthetic is the metatitanic acid sodium metasilicate.

2. tubular welding wire for gas protective arc welding as claimed in claim 1, its feature are that also the filling solder flux is except containing Na ₂O and TiO ₂Synthetic or contain Na ₂O, SiO ₂And TiO ₂Synthetic outside, also contain with Na ₂O scaled value meter is at the Na below 0.3% ₂O source and/or with TiO ₂The scaled value meter is at the TiO below 1.5% ₂The source.

3. flux cored wire as claimed in claim 1, its feature also are, corresponding to gross mass % wiry, also contain C:0.02～0.15%, Ti:0.02～0.3%, B:0.001～0.01%.

4. flux cored wire as claimed in claim 3, its feature also be, corresponding to gross mass % wiry, also contains more than a kind or 2 kinds below the Mo:0.7% as alloying agents, below the Ni:1.75%, below the Cr:1.0%.

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