CN101549430A - Tungsten electrode argon arc welding technology of zinc base alloy - Google Patents
Tungsten electrode argon arc welding technology of zinc base alloy Download PDFInfo
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- CN101549430A CN101549430A CNA2009100150864A CN200910015086A CN101549430A CN 101549430 A CN101549430 A CN 101549430A CN A2009100150864 A CNA2009100150864 A CN A2009100150864A CN 200910015086 A CN200910015086 A CN 200910015086A CN 101549430 A CN101549430 A CN 101549430A
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Abstract
The invention discloses a tungsten electrode argon arc welding technology of zinc base alloy. The invention solves the problems that the existing zinc base alloy is not easily welded and traditional tungsten electrode argon arc welding can not be used directly for welding the zinc base alloy and has the advantages of simple method, high welding quality and satisfaction of the requirements for the service performance of a weld joint. The technology comprises the following steps of: 1) preparation before welding: clearing before welding and preheating workpieces with thickness of more than 8mm and preheating no workpieces with thickness of less than 8mm; 2) welding method: adopting the tungsten electrode argon arc welding and using a leftward welding method to reduce the overheat of a molten pool; and 3) clearing after welding: completely clearing remnant welding flux and reaction products thereof remained in welding seams and near the welding seams.
Description
Technical field
The present invention relates to the welding procedure of a kind of mould, relate in particular to a kind of argon tungsten arc process of zinc-containing alloy with zinc-containing alloy.
Background technology
Zinc-containing alloy is in casting process, and percent defective is generally 6～12%, and existing blemish also has internal flaw, and blemish mainly is surface hole defect, surface depression; Internal flaw mainly is internal porosity, shrinkage cavity, loose, field trash etc., flaw size generally little (comparing) with cast iron, but need the defect level repaired many; Therefore in use the flaw size of Chan Shenging is generally bigger, and the welding job amount of repairing each defective is big, needs a kind of welding method that can guarantee that welding quality again can small investment, cost is low, productivity ratio is high.
In addition because zinc-containing alloy characteristics such as to have thermal conductivity strong, and linear expansion coefficient is big, and fusing point is low, and elevated temperature strength is low; Add zinc and evaporate easily, therefore bring certain difficulty to welding.
The heat of argon tungsten-arc welding is more concentrated, and the heat affected area is little, and welding deformation and stress are little, and the material ranges that can weld is wide, and suitable especially more active metal and the alloy thereof of chemical property is commonly used to welding of aluminum, magnesium, copper and alloy thereof; The protective value of argon gas is good, adds " negative electrode fragmentation " effect, when welding of aluminum and alloy thereof, can be without solder flux, and remove surface film oxide by electric arc.Argon tungsten-arc welding is compared with metal argon arc welding, and arc power is little, and the heat input is few, welds zinc-containing alloy with it, can reduce the evaporation of zinc.Argon tungsten-arc welding is used extensivelyr aborning in addition, adds less demanding to the zinc-containing alloy wire size, applies easily.
Find that by test when electric current was alternating current, " negative electrode fragmentation " was though surface film oxide can be partly removed in effect, formation fuses weld seam preferably, but the evaporation of zinc is very serious, produces a large amount of smog that contains zinc fume, and health is produced adverse influence.This is the temperature height (gas welding is compared with oxy-acetylene) because of argon tungsten-arc welding, and zinc is easy to evaporation, and the evaporation of zinc has changed the composition in the arc column atmosphere, has reduced the protection effect of argon gas, makes the alloying elements oxidization burning loss, forms a large amount of smog.For addressing this problem, must when welding, add solder flux, the evaporation capacity of zinc is reduced greatly.
Summary of the invention
Purpose of the present invention is exactly to be difficult for welding in order to solve present zinc-containing alloy, the conventional tungsten electrode argon arc welding can't be directly used in the problem of zinc-containing alloy, provide that a kind of to have method simple, welding quality is good, meets the argon tungsten arc process of the zinc-containing alloy of advantages such as welding quality requirement.
For achieving the above object, the present invention adopts following technical scheme:
A kind of argon tungsten arc process of zinc-containing alloy, its step is:
1) welds preceding the preparation and preweld cleaning; Carry out preheating for wall thickness greater than the workpiece of 8mm, wall thickness need not preheating less than the workpiece of 8mm;
2) welding: adopt argon tungsten-arc welding, overheated with leftward welding minimizing molten bath;
3) postwelding cleaning: with postwelding stay weld seam and near remaining solder flux and product thereof clean out.
In the described step 1), for wall thickness greater than the preheat temperature of 8mm workpiece at 100 ℃～140 ℃; The employing oxy-acetylene flame carries out local preheating or additive method carries out whole preheating.
In the described step 1), set-up procedure is before the weldering: groove processing, promptly, at first the defective on the workpiece is cleared up processing for the workpiece of soldering, with emery wheel or other instruments field trash, pore, shrinkage cavity, rarefaction defect are cleared up, then place to be welded is processed into U type groove; Then groove should be processed into V-type for the workpiece that connects.
In the described step 1), preweld cleaning is: at first with mechanical means the surface is cleared up, cleaned with acetone or alcohol, with hot blast workpiece is carried out drying then and handle, the workpiece of handling well should weld at once, in case workpiece is polluted once more.
Described step 2) in, the detailed process of welding is: adopt ac tungsten inert gases welding, welding current is 50～80A, arc voltage 18～22V, speed of welding is 4～12m/h, and argon flow amount is 5～10L/min, and tungsten electrode is a cerium tungsten level, solder flux adopt to mix solder flux, and packing material be the welding rod with the mother metal homogeneity; Adopt leftward welding, the inclination angle of tip and surface of the work should remain on 30 °～80 °, for the ease of operation, the inclination angle of welding rod and surface of the work should be 20 °～60 °, and welding rod will be sent on fusing of margin limit, the place ahead of tip, when welding finishes, for preventing to burn or subside, the arc that should make a circulation to receive, and arc crater filled up; To use backing plate overleaf during butt welding.
Described each composition of mixing solder flux is by WT%: KCl 25～40%, and LiCl 15～25%, KF5～20%, ZnCl
215～30%.
In the described step 3), the postwelding scale removal process is: want butt welded seam and flux residue on every side thereof and product in time to clear up after having welded, available hairbrush washes away in flowing water.
The present invention is through repetition test, thickness can not carry out preheating less than the workpiece of 8mm when determining welding, thickness will carry out part or whole preheating during greater than 8mm, preheat temperature generally is not less than 100 ℃, when after preheating, smearing solder flux like this, moisture in the solder flux can evaporate, and reduces the adverse effect to welding; Should select little heat input for use, reduce the input of heat, prevent the evaporation of zinc.The welding condition of argon tungsten-arc welding sees Table 1.
The welding condition of table 1 argon tungsten-arc welding
| The electric current kind | Tungsten electrode diameter (mm) | Welding current (A) | Welding rod diameter (mm) | Argon flow amount (L/min) | Speed of welding (m/h) |
| Exchange | 1.6～3.2 | 50～80 | 2.4～3.2 | 5～10 | 4～12 |
1, packing material selects for use
According to the characteristic and the weldability analysis of zinc-containing alloy, in conjunction with the production actual conditions, the packing material with the mother metal homogeneity is selected in our decision for use, casts the welding rod that diameter is φ 2.4～3.2mm.Because the sand during sand casting on the welding rod is removed relatively difficulty, the most handy permanent mold casting.The welding rod that casting is good should be placed on shady and cool dry place, uses front surface should smear solder flux, to remove its surface film oxide.By evidence, use the homogeneity packing material, though the zinc content of weld seam is compared with mother metal decline is arranged slightly, the mechanical property of welding point and the corrosion resistance of weld seam can satisfy instructions for use fully, and the homogeneity packing material is convenient to produce, and help applying.
2, the development of solder flux
Flux for argon tungsten arc welding:
The major components of flux for argon tungsten arc welding is chloride KCl, LiCl, ZnCl
2With fluoride KF, the main effect of solder flux is to remove surface film oxide and protection welding pool.The argon arc welding solder flux also should be able to make arc stability burn, splash less, appearance of weld is attractive in appearance, the evaporation of zinc is few etc. except that should having the striping effect that appropriate melting point, good mobility become reconciled.Find that by test the content of the LiCl of flux for argon tungsten arc welding can be lower than gas flux, can reduce the cost of solder flux like this, but the too low meeting of LiCl content makes the stability decreases of electric arc, influences appearance of weld; ZnCl
2Though a spot of Zn of transition in the weld seam in the past is to replenish the evaporation of zinc, ZnCl
2When content is too high, can produce a large amount of splashing in the welding process, electric arc can not smooth combustion when serious, so ZnCl
2Content can not be too high; The content of KCl and KF is also moderate, when content is too high, the fusing point of solder flux is raise, and viscosity increases, and is easy to generate defectives such as slag inclusion (mixing), pore during welding.Through repetition test, determined the prescription of flux for argon tungsten arc welding at last, see Table 2.
The composition WT% of table 2 flux for argon tungsten arc welding
Result of the test shows; add solder flux during argon tungsten-arc welding; can reduce the evaporation of zinc; explanation to this is that because the fusing point of solder flux is lower than the boiling point of zinc, proportion is littler than zinc-containing alloy; float over weld pool surface after the solder melts; form layer protecting film, when temperature reached the boiling point of zinc, it can stop the evaporation of zinc.Zinc-containing alloy welding procedure main points:
1, prepares before the weldering
Preweld cleaning: during the zinc-containing alloy welding, answer the oxide-film and the greasy dirt of strict cleaning workpiece weld zone before the weldering, clear quality will directly influence quality of weld joint and performance, otherwise be easy to generate defectives such as weld porosity, slag inclusion, incomplete fusion, influence the performance of welding point.Can adopt Chemical cleaning and two kinds of methods of mechanical chipping on producing.
Weld preheating: thin, small workpiece for thick big, reaches required welding temperature generally without preheating near making weld bond, to reduce distortion, pore etc., should carry out preheating before welding.General preheat temperature is 120 ± 10 ℃, can carry out part or whole heating with oxy-acetylene flame, electric furnace etc.
In addition because the elevated temperature strength of zinc-containing alloy is very low, liquid fluidity is good, there is not change color from liquid state to solid-state, bring certain difficulty to operation, very easily make molten pool metal overheated and stay during welding, subside for guaranteeing that through welding is unlikely again, use backing plate to hold deposite metal and near metal in case of necessity, backing plate can be used graphite cake, corrosion resistant plate etc.
2, welding procedure characteristic
For preventing lack of penetration or the incomplete fusion phenomenon, slope type should be U type or asymmetric X type during the zinc-containing alloy welding; For preventing the evaporation of zinc, reduce the input of heat during welding as far as possible and strengthen protection, select little heat input during argon tungsten-arc welding for use and use solder flux; Employing leftward welding minimizing molten bath is overheated etc.
3, postwelding cleaning
Postwelding stay weld seam and near remaining solder flux and and product, need in time clean out, otherwise can produce corrosion workpiece.The method of cleaning can be placed on workpiece in the mobile water and wash away.
The invention has the beneficial effects as follows: fuse good, flawless weld seam, can make the evaporation capacity of zinc few again, production cost is low, and is simple to operate, is easy to apply.
The specific embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1:
A kind of argon tungsten arc process of zinc-containing alloy, its step is:
1) prepare before the weldering:
Carry out preweld cleaning; Carry out preheating for wall thickness greater than the workpiece of 8mm, wall thickness need not preheating less than the workpiece of 8mm; Preheat temperature is at 100 ℃; Adopt oxy-acetylene flame to carry out the interior whole preheating of stove or other the of the prior art whole preheating method of local preheating or employing prior art.Set-up procedure is before the weldering: groove processing: for the workpiece of soldering, at first the defective on the workpiece is cleared up processing, with emery wheel or other instruments field trash, pore, shrinkage cavity, defective such as loose are cleared up, then place to be welded is processed into U type groove; Groove should be processed into V-type for the workpiece that connects;
Preweld cleaning: at first with mechanical means the surface is cleared up, cleaned with acetone or alcohol, with hot blast workpiece is carried out drying then and handle, it is oversize that the workpiece of handling well is not wanted standing time, should weld, in case workpiece is polluted once more at once.
2) welding method:
Adopt argon tungsten-arc welding, overheated with leftward welding minimizing molten bath; The detailed process of welding is: adopt ac tungsten inert gases welding, welding current is 50A, arc voltage 18V, and for speed of welding is 4m/h, argon flow amount is 5L/min, and tungsten electrode is a cerium tungsten level, and solder flux adopts and mixes solder flux, and packing material be the welding rod with the mother metal homogeneity; Adopt leftward welding, the inclination angle of tip and surface of the work should remain on 30 °, for the ease of operation, the inclination angle of welding rod and surface of the work should be 20 °, and welding rod will send on fusing of margin limit, the place ahead of tip, when welding finishes, for preventing to burn or subside, the arc that should make a circulation to receive, and arc crater filled up; To use backing plate overleaf during butt welding.Flux constituent is by WT%: KCl 25%, and LiCl 25%, KF20%, ZnCl
230%.
3) postwelding cleaning:
With postwelding stay weld seam and near remaining solder flux and product thereof clean out, available hairbrush washes away in flowing water.
Embodiment 2:
A kind of argon tungsten arc process of zinc-containing alloy, its step is:
1) prepare before the weldering:
Carry out preweld cleaning; Carry out preheating for wall thickness greater than the workpiece of 8mm, wall thickness need not preheating less than the workpiece of 8mm; Preheat temperature is at 120 ℃; Adopt oxy-acetylene flame to carry out the interior whole preheating of stove or other the of the prior art whole preheating method of local preheating or employing prior art.Set-up procedure is before the weldering: groove processing: for the workpiece of soldering, at first the defective on the workpiece is cleared up processing, with emery wheel or other instruments field trash, pore, shrinkage cavity, defective such as loose are cleared up, then place to be welded is processed into U type groove; Groove should be processed into V-type for the workpiece that connects;
Preweld cleaning: at first with mechanical means the surface is cleared up, cleaned with acetone, alcohol, with hot blast workpiece is carried out drying then and handle, it is oversize that the workpiece of handling well is not wanted standing time, should weld, in case workpiece is polluted once more at once.
2) welding method:
Adopt argon tungsten-arc welding, overheated with leftward welding minimizing molten bath; The detailed process of welding is: adopt ac tungsten inert gases welding, welding current is 70A, arc voltage 20V, and for speed of welding is 8m/h, argon flow amount is 8L/min, and tungsten electrode is a cerium tungsten level, and solder flux adopts and mixes solder flux, and packing material be the welding rod with the mother metal homogeneity; Adopt leftward welding, the inclination angle of tip and surface of the work should remain on 60 °, for the ease of operation, the inclination angle of welding rod and surface of the work should be 40 °, and welding rod will send on fusing of margin limit, the place ahead of tip, when welding finishes, for preventing to burn or subside, the arc that should make a circulation to receive, and arc crater filled up; To use backing plate overleaf during butt welding.Flux constituent is by WT%: KCl 35%, and LiCl 15%, KF20%, ZnCl
230%.
3) postwelding cleaning:
With postwelding stay weld seam and near remaining solder flux and and product clean out, available hairbrush washes away in flowing water.
Embodiment 3:
A kind of argon tungsten arc process of zinc-containing alloy, its step is:
1) prepare before the weldering:
Carry out preweld cleaning; Carry out preheating for wall thickness greater than the workpiece of 8mm, wall thickness need not preheating less than the workpiece of 8mm; Preheat temperature is at 140 ℃; Adopt oxy-acetylene flame to carry out the interior whole preheating of stove or other the of the prior art whole preheating method of local preheating or employing prior art; Set-up procedure is before the weldering: groove processing: for the workpiece of soldering, at first the defective on the workpiece is cleared up processing, with emery wheel or other instruments field trash, pore, shrinkage cavity, defective such as loose are cleared up, then place to be welded is processed into U type groove; Groove should be processed into V-type for the workpiece that connects;
Preweld cleaning: at first with mechanical means the surface is cleared up, cleaned with acetone or alcohol, with hot blast workpiece is carried out drying then and handle, it is oversize that the workpiece of handling well is not wanted standing time, should weld, in case workpiece is polluted once more at once.
2) welding method:
Adopt argon tungsten-arc welding, overheated with leftward welding minimizing molten bath; The detailed process of welding is: adopt ac tungsten inert gases welding, welding current is 80A, arc voltage 22V, and for speed of welding is 12m/h, argon flow amount is 10L/min, and tungsten electrode is a cerium tungsten level, and solder flux adopts and mixes solder flux, and packing material be the welding rod with the mother metal homogeneity; Adopt leftward welding, the inclination angle of tip and surface of the work should remain on 80 °, for the ease of operation, the inclination angle of welding rod and surface of the work should be 60 °, and welding rod will send on fusing of margin limit, the place ahead of tip, when welding finishes, for preventing to burn or subside, the arc that should make a circulation to receive, and arc crater filled up; To use backing plate overleaf during butt welding.Flux constituent is by WT%: KCl 40%, and LiCl 25%, KF5%, ZnCl
230%.
3) postwelding cleaning:
With postwelding stay weld seam and near remaining solder flux and product thereof clean out, available hairbrush washes away in flowing water.
Embodiment 4:
A kind of argon tungsten arc process of zinc-containing alloy, its step is:
1) prepare before the weldering:
Carry out preweld cleaning; Carry out preheating for wall thickness greater than the workpiece of 8mm, wall thickness need not preheating less than the workpiece of 8mm; Preheat temperature is at 110 ℃; Adopt oxy-acetylene flame to carry out the interior whole preheating of stove or other the of the prior art whole preheating method of local preheating or employing prior art.Set-up procedure is before the weldering: groove processing: for the workpiece of soldering, at first the defective on the workpiece is cleared up processing, with emery wheel or other instruments field trash, pore, shrinkage cavity, defective such as loose are cleared up, then place to be welded is processed into U type groove; Groove should be processed into V-type for the workpiece that connects;
Preweld cleaning: at first with mechanical means the surface is cleared up, cleaned with acetone or alcohol, with hot blast workpiece is carried out drying then and handle, it is oversize that the workpiece of handling well is not wanted standing time, should weld, in case workpiece is polluted once more at once.
2) welding method:
Adopt argon tungsten-arc welding, overheated with leftward welding minimizing molten bath; The detailed process of welding is: adopt ac tungsten inert gases welding, welding current is 60A, arc voltage 19V, and for speed of welding is 6m/h, argon flow amount is 6L/min, and tungsten electrode is a cerium tungsten level, and solder flux adopts and mixes solder flux, and packing material be the welding rod with the mother metal homogeneity; Adopt leftward welding, the inclination angle of tip and surface of the work should remain on 40 °, for the ease of operation, the inclination angle of welding rod and surface of the work should be 30 °, and welding rod will send on fusing of margin limit, the place ahead of tip, when welding finishes, for preventing to burn or subside, the arc that should make a circulation to receive, and arc crater filled up; To use backing plate overleaf during butt welding.Flux constituent is by WT%: KCl 40%, and LiCl 25%, and KF 20%, ZnCl
215%.
3) postwelding cleaning:
With postwelding stay weld seam and near remaining solder flux and and product clean out, available hairbrush washes away in flowing water.
Embodiment 5:
A kind of argon tungsten arc process of zinc-containing alloy, its step is:
1) prepare before the weldering:
Carry out preweld cleaning; Carry out preheating for wall thickness greater than the workpiece of 8mm, wall thickness need not preheating less than the workpiece of 8mm; Preheat temperature is at 130 ℃; Adopt oxy-acetylene flame to carry out the interior whole preheating of stove or other the of the prior art whole preheating method of local preheating or employing prior art.Set-up procedure is before the weldering: groove processing: for the workpiece of soldering, at first the defective on the workpiece is cleared up processing, with emery wheel or other instruments field trash, pore, shrinkage cavity, defective such as loose are cleared up, then place to be welded is processed into U type groove; Groove should be processed into V-type for the workpiece that connects;
Preweld cleaning: at first with mechanical means the surface is cleared up, cleaned with acetone or alcohol, with hot blast workpiece is carried out drying then and handle, it is oversize that the workpiece of handling well is not wanted standing time, should weld, in case workpiece is polluted once more at once.
2) welding method:
Adopt argon tungsten-arc welding, overheated with leftward welding minimizing molten bath; The detailed process of welding is: adopt ac tungsten inert gases welding, welding current is 65A, arc voltage 21V, and for speed of welding is 9m/h, argon flow amount is 9L/min, and tungsten electrode is a cerium tungsten level, and solder flux adopts and mixes solder flux, and packing material be the welding rod with the mother metal homogeneity; Adopt leftward welding, the inclination angle of tip and surface of the work should remain on 50 °, for the ease of operation, the inclination angle of welding rod and surface of the work should be 50 °, and welding rod will send on fusing of margin limit, the place ahead of tip, when welding finishes, for preventing to burn or subside, the arc that should make a circulation to receive, and arc crater filled up; To use backing plate overleaf during butt welding.Flux constituent is by WT%: KCl 30%, and LiCl 20%, KF20%, ZnCl
230%.
3) postwelding cleaning:
With postwelding stay weld seam and near remaining solder flux and product thereof clean out, available hairbrush washes away in flowing water.
Embodiment 6:
A kind of argon tungsten arc process of zinc-containing alloy, its step is:
1) prepare before the weldering:
Carry out preweld cleaning; Carry out preheating for wall thickness greater than the workpiece of 8mm, wall thickness need not preheating less than the workpiece of 8mm; Preheat temperature is at 125 ℃; Adopt oxy-acetylene flame to carry out the interior whole preheating of stove or other the of the prior art whole preheating method of local preheating or employing prior art.Set-up procedure is before the weldering: groove processing: for the workpiece of soldering, at first the defective on the workpiece is cleared up processing, with emery wheel or other instruments field trash, pore, shrinkage cavity, defective such as loose are cleared up, then place to be welded is processed into U type groove; Groove should be processed into V-type for the workpiece that connects;
Preweld cleaning: at first with mechanical means the surface is cleared up, cleaned with acetone or alcohol, with hot blast workpiece is carried out drying then and handle, it is oversize that the workpiece of handling well is not wanted standing time, should weld, in case workpiece is polluted once more at once.
2) welding method:
Adopt argon tungsten-arc welding, overheated with leftward welding minimizing molten bath; The detailed process of welding is: adopt ac tungsten inert gases welding, welding current is 75A, arc voltage 21V, and for speed of welding is 10m/h, argon flow amount is 10L/min, and tungsten electrode is a cerium tungsten level, and solder flux adopts and mixes solder flux, and packing material be the welding rod with the mother metal homogeneity; Adopt leftward welding, the inclination angle of tip and surface of the work should remain on 70 °, for the ease of operation, the inclination angle of welding rod and surface of the work should be 40 °, and welding rod will send on fusing of margin limit, the place ahead of tip, when welding finishes, for preventing to burn or subside, the arc that should make a circulation to receive, and arc crater filled up; To use backing plate overleaf during butt welding.Flux constituent is by WT%: KCl 35%, and LiCl 20%, KF20%, ZnCl
225%.
3) postwelding cleaning:
With postwelding stay weld seam and near remaining solder flux and and product clean out, available hairbrush washes away in flowing water.
Embodiment 7:
Embodiment 1:
A kind of argon tungsten arc process of zinc-containing alloy, its step is:
1) prepare before the weldering:
Carry out preweld cleaning; Carry out preheating for wall thickness greater than the workpiece of 8mm, wall thickness need not preheating less than the workpiece of 8mm; Preheat temperature is at 135 ℃; Adopt oxy-acetylene flame to carry out the interior whole preheating of stove or other the of the prior art whole preheating method of local preheating or employing prior art.Set-up procedure is before the weldering: groove processing: for the workpiece of soldering, at first the defective on the workpiece is cleared up processing, with emery wheel or other instruments field trash, pore, shrinkage cavity, defective such as loose are cleared up, then place to be welded is processed into U type groove; Groove should be processed into V-type for the workpiece that connects;
Preweld cleaning: at first with mechanical means the surface is cleared up, cleaned with acetone or alcohol, with hot blast workpiece is carried out drying then and handle, it is oversize that the workpiece of handling well is not wanted standing time, should weld, in case workpiece is polluted once more at once.
2) welding method:
Adopt argon tungsten-arc welding, overheated with leftward welding minimizing molten bath; The detailed process of welding is: adopt ac tungsten inert gases welding, welding current is 55A, arc voltage 22V, and for speed of welding is 11m/h, argon flow amount is 11L/min, and tungsten electrode is a cerium tungsten level, and solder flux adopts and mixes solder flux, and packing material be the welding rod with the mother metal homogeneity; Adopt leftward welding, the inclination angle of tip and surface of the work should remain on 75 °, for the ease of operation, the inclination angle of welding rod and surface of the work should be 50 °, and welding rod will send on fusing of margin limit, the place ahead of tip, when welding finishes, for preventing to burn or subside, the arc that should make a circulation to receive, and arc crater filled up; To use backing plate overleaf during butt welding.Flux constituent is by WT%: KCl 34%, and LiCl 23%, KF15%, ZnCl
228%.
3) postwelding cleaning:
With postwelding stay weld seam and near remaining solder flux and and product clean out, available hairbrush washes away in flowing water.
Claims (7)
1. the argon tungsten arc process of a zinc-containing alloy is characterized in that, its step is:
1) welds preceding the preparation and preweld cleaning; Carry out preheating for wall thickness greater than the workpiece of 8mm, wall thickness need not preheating less than the workpiece of 8mm;
2) welding: adopt argon tungsten-arc welding, overheated with leftward welding minimizing molten bath;
3) postwelding cleaning: with postwelding stay weld seam and near remaining solder flux and product thereof clean out.
2. the argon tungsten arc process of zinc-containing alloy as claimed in claim 1, it is characterized in that, in the described step 1), for wall thickness greater than the preheat temperature of 8mm workpiece at 100 ℃～140 ℃, and adopt oxy-acetylene flame to carry out local preheating or additive method carries out whole preheating.
3. the argon tungsten arc process of zinc-containing alloy as claimed in claim 1, it is characterized in that, in the described step 1), set-up procedure is before the weldering: groove processing, promptly for the workpiece of soldering, at first the defective on the workpiece is cleared up processing, field trash, pore, shrinkage cavity, rarefaction defect are cleared up, then place to be welded is processed into U type groove with emery wheel or other instruments; Then groove should be processed into V-type for the workpiece that connects.
4. the argon tungsten arc process of zinc-containing alloy as claimed in claim 1, it is characterized in that, in the described step 1), preweld cleaning is: at first with mechanical means the surface is cleared up, clean with acetone or alcohol again, with hot blast workpiece is carried out drying then and handle, the workpiece of handling well should weld at once, in case workpiece is polluted once more.
5. the argon tungsten arc process of zinc-containing alloy as claimed in claim 1, it is characterized in that, described step 2) in, the detailed process of welding is: adopt ac tungsten inert gases welding, welding current is 50～80A, arc voltage 18～22V, speed of welding is 4～12m/h, and argon flow amount is 5～10L/min, and tungsten electrode is a cerium tungsten level, solder flux adopt to mix solder flux, and packing material be the welding rod with the mother metal homogeneity; Adopt leftward welding, the inclination angle of tip and surface of the work should remain on 30 °～80 °, for the ease of operation, the inclination angle of welding rod and surface of the work should be 20 °～60 °, and welding rod will be sent on fusing of margin limit, the place ahead of tip, when welding finishes, for preventing to burn or subside, the arc that should make a circulation to receive, and arc crater filled up; To use backing plate overleaf during butt welding.
6. the argon tungsten arc process of zinc-containing alloy as claimed in claim 4 is characterized in that, described each composition of mixing solder flux is by WT%: KCl 25～40%, and LiCl 15～25%, KF5～20%, ZnCl
215～30%.
7. the argon tungsten arc process of zinc-containing alloy as claimed in claim 1, it is characterized in that, in the described step 3), the postwelding scale removal process is: want butt welded seam and flux residue on every side thereof and product in time to clear up after having welded, available hairbrush washes away in flowing water.
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| CNA2009100150864A CN101549430A (en) | 2009-05-08 | 2009-05-08 | Tungsten electrode argon arc welding technology of zinc base alloy |
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| CNA2009100150864A CN101549430A (en) | 2009-05-08 | 2009-05-08 | Tungsten electrode argon arc welding technology of zinc base alloy |
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| CN (1) | CN101549430A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357718A (en) * | 2011-10-14 | 2012-02-22 | 河北首钢燕郊机械有限责任公司 | Stainless steel sheet welding method capable of preventing weld cracks |
| CN104551355A (en) * | 2015-01-08 | 2015-04-29 | 山东大学 | Soldering flux filled type pulse welding method for magnesium alloy pipe fitting |
| CN105345222A (en) * | 2015-11-24 | 2016-02-24 | 唐山轨道客车有限责任公司 | Single-face-welding and double-face-forming welding method |
| CN108127216A (en) * | 2017-12-18 | 2018-06-08 | 唐山师范学院 | A kind of low-alloy bainite steel manual argon arc welding connects technique |
| CN109676221A (en) * | 2019-01-23 | 2019-04-26 | 广州中船文冲船坞有限公司 | A kind of welding method of main engine jacket package zine plate |
| CN110508972A (en) * | 2019-08-02 | 2019-11-29 | 武汉理工大学 | A kind of zinc-aluminium parent metal scaling powder and preparation method thereof |
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2009
- 2009-05-08 CN CNA2009100150864A patent/CN101549430A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357718A (en) * | 2011-10-14 | 2012-02-22 | 河北首钢燕郊机械有限责任公司 | Stainless steel sheet welding method capable of preventing weld cracks |
| CN102357718B (en) * | 2011-10-14 | 2013-06-05 | 河北首钢燕郊机械有限责任公司 | Stainless steel sheet welding method capable of preventing weld cracks |
| CN104551355A (en) * | 2015-01-08 | 2015-04-29 | 山东大学 | Soldering flux filled type pulse welding method for magnesium alloy pipe fitting |
| CN105345222A (en) * | 2015-11-24 | 2016-02-24 | 唐山轨道客车有限责任公司 | Single-face-welding and double-face-forming welding method |
| CN105345222B (en) * | 2015-11-24 | 2017-08-25 | 中车唐山机车车辆有限公司 | The welding method of single face welding and double face shaping |
| CN108127216A (en) * | 2017-12-18 | 2018-06-08 | 唐山师范学院 | A kind of low-alloy bainite steel manual argon arc welding connects technique |
| CN109676221A (en) * | 2019-01-23 | 2019-04-26 | 广州中船文冲船坞有限公司 | A kind of welding method of main engine jacket package zine plate |
| CN110508972A (en) * | 2019-08-02 | 2019-11-29 | 武汉理工大学 | A kind of zinc-aluminium parent metal scaling powder and preparation method thereof |
| CN110508972B (en) * | 2019-08-02 | 2021-12-21 | 武汉理工大学 | Flux for zinc-aluminum-based solder and preparation method thereof |
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Open date: 20091007 |