CN102151959B - High-speed welding production process and device for thin-walled steel tubes - Google Patents
High-speed welding production process and device for thin-walled steel tubes Download PDFInfo
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Abstract
The invention relates to a high-speed welding production process and device for thin-walled steel tubes. A front and a rear independent TIG (Tungsten Inert Gas) welding power sources are arranged on a welding position; a stainless steel belt is reshaped and coiled into a steel tube shape and is continuously conveyed to the welding position; and as the front and the rear independent TIG welding power sources are arranged on the welding position, first TIG arc welding is carried out to completely penetrate through welding seams and welding seams on the inner surface of the steel tube are ensured to be formed, and then, second TIG arc welding is carried out to heat a rear part of a weld pool formed by the first TIG arc welding, and the welding seams on the outer surface of the steel tube are ensured to be flat and continuous. By means of the high-speed welding production process and device in the invention, the high-speed welding production of the thin-walled steel tubes is realized, the steel tubes which have favorable and standard formed welding seam surfaces and have the welding seam mechanical performances meeting requirements can be produced, and thus, the problem of difficulty in realizing high welding speed and high welding quality at the same time is solved.
Description
Technical field
The present invention relates to the steel pipe welding production technology of a kind of welding production technology and device of steel pipe, particularly a kind of double T IG electric arc, by this welding method, can realize the high-speed welding of thin-wall steel tube and the backing welding of thick walled steel tube.
Background technology
Solder technology is the key technology of current steel pipe's production, and it has determined quality and the efficiency of steel pipe's production, and the restriction of various different welding technique speeds of welding becomes the main bugbear that improves output of steel tube.For thin-walled (wall thickness≤3mm) steel pipe, DC TIG welding is one of its main welding production technology.As for industrial stainless steel tube, both required steel pipe seam complete penetration and surfaces externally and internally to be shaped attractive in appearance, require again weld seam to there is higher mechanical property.Therefore, speed of welding becomes the bottleneck that stainless steel tube welding output improves.Under the condition of not considering the tungsten electrode scaling loss, adopt large electric current welding, for wall thickness 1.5mm stainless steel tube welding, to produce, speed of welding is only up to 1.8m/min, the thick stainless steel tube for 1.0mm, its welding speed of production reaches as high as 2.5m/min.If further improve again speed of welding in order to improve stainless steel tube output, can cause the shaping surface defects such as face of weld undercut, pit, humping weld and affect weld properties, thereby causing tube quality not up to standard.Therefore, guaranteeing that appearance of weld and mechanical property reach under the condition of standard-required, improving speed of welding and become the difficult problem that thin-wall steel tube manufacturing enterprise raising output is faced jointly.
Although high-frequency resistance welding (HFRW) can reach very high speed of welding, because the overlap of inside pipe wall is difficult to remove, can not meet the requirement that the butt welded seam inner surface is shaped, limited its application in industrial steel pipe's production that the inside pipe wall appearance of weld is had certain requirements.Welding technique as a kind of high-energy-density, plasma arc welding (PAW) also can realize the welding of fair speed, but, after speed surpasses 2～3m/min, its appearance of weld welds the same forming defectses such as undercut, pit, hump that also there will be with TIG.In addition, high-frequency resistance welding (HFRW) TIG weldering relative to plasma arc welding (PAW), the cost of its welding equipment is much higher.
For ferrous materials such as stainless steels, because the viscosity of liquid metal is large, under high speed TIG welding condition, under the repulsive interaction and motional inertia effect of arc force, molten pool metal is mainly piled up to the rear, molten bath.Because speed of welding is fast, the molten bath cooling velocity is also fast, the liquid metal that is stacked into the rear, the molten bath just solidification forming that also do not have enough time to reflux while filling the molten bath subsided, thereby cause the shaping surface defects such as undercut, pit and humping weld, shaping surface is not up to standard on the one hand for the weld seam that has these defects to exist, and has seriously reduced on the other hand the mechanical property of weld seam yet.The reason formed according to the appearance of weld defect, adopt additional heating source to extend the time that liquid metal exists, in order to can reflux, fills the depression in molten bath, forms flat, the continuous weld seam of surfacing.
Summary of the invention
The object of the invention is to provide a kind of thin-wall steel tube high-speed welding production technology and device, this technique not only can realize high speed, the efficient welding production of thin-wall steel tube, can also realize the high speed backing welding that the thick walled steel tube multilayer welding is delivered a child in producing, solve the technical barrier that the thin-wall steel tube welding yields poorly.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of thin-wall steel tube high-speed welding production technology, stainless steel band is rolled into to steel pipe shape through shaping and is delivered to continuously welding position, the place, welding position arranges former and later two TIG sources of welding current, first through a TIG arc welding, make weld seam complete penetration and guarantee the appearance of weld of steel pipe internal-surface, heated with the rear portion, molten bath the one TIG electric arc formed by the 2nd TIG electric arc, guaranteed that the outer surface of steel tube smooth welded seam is continuous.
Described speed of welding is 1.0-8.0m/min, thickness of steel pipe scope 0.5-6mm.
A described TIG electric arc is produced by a TIG welding gun, and the 2nd TIG electric arc is produced by the 2nd TIG welding gun.
Between described the 2nd TIG welding gun and a TIG welding gun, distance is 0-60mm.
A described TIG welding gun is seamed into the attitude of 40-90 ° of angle in steel pipe butting grooves plane with the horizontal butt welding of steel pipe, the welding current of the one TIG electric arc is at 30-400A, arc voltage between 10-40V, and the most advanced and sophisticated distance to the butt joint edge upper surface of tungsten electrode is 0.1-5mm.
Described the 2nd TIG welding gun and a TIG welding gun are in same plane, be seamed into 60-90 ° of angle with the horizontal butt welding of steel pipe in steel pipe butting grooves plane, the welding current of the 2nd TIG electric arc is that 30-350A, arc voltage are 10-40V, and the most advanced and sophisticated distance to the butt joint edge upper surface of tungsten electrode is 0.1-5mm.
Described steel pipe is round tube or rectangular tube or oval pipe and other shape tubes.
A kind of thin-wall steel tube high-speed welding process units, comprise steel pipe conveying device, downhand welding welder, former and later two TIG sources of welding current independently that the downhand welding welder is included in that welding position arranges, two TIG sources of welding current produce respectively a TIG electric arc and the 2nd TIG electric arc, the 2nd TIG welding gun and a TIG welding gun are in same plane, and be positioned at its back, between two welding guns, distance is 0-60mm, becomes 0-90 ° of angle.
The mode that before and after adopting, two TIG electric arc row are put, the one TIG electric arc is guaranteed weld seam complete penetration and is guaranteed the appearance of weld of steel pipe internal-surface, provide auxiliary thermal source with the 2nd TIG electric arc thereafter, the molten bath afterbody that the one TIG electric arc is formed is heated, and make it keep liquid state, extend the life period in the liquid molten bath of outer surface of steel tube, make it have the sufficient time to reflux and fill staying of molten bath, thereby can form the continuous weld seam of surfacing.In the technical program, before and after two TIG electric arcs there is the clear and definite division of labor: a TIG electric arc guarantees that weld seam can complete penetration and the appearance of weld of steel pipe internal-surface, the 2nd TIG electric arc guarantees the appearance of weld of steel pipe outside, and can not make the overheated crystal grain that causes of outer surface of steel tube molten pool metal too thick.The 2nd TIG electric arc provides auxiliary thermal source, has extended the life period of liquid molten pool metal, and the liquid metal backflow of piling up for the rear portion, molten bath provides the sufficient time, is the key that stainless steel obtains surfacing continuous weld under the high-speed welding condition.The method adopts the TIG source of welding current of two platform independent, both can the same model same specification, and also can the different model different size; Can be both digital welding power source, can be also that common Inverter TIG Welding connects power supply, the IGCT TIG source of welding current.The mother metal that the method is used can be both stainless steel material, also can carbon steel, the non-ferrous metals such as the ferrous metal such as steel alloy and aluminium alloy, titanium alloy, to weld steel pipe and the nonferrous metal tube produced can be round tube, rectangular tube and other shape tubes.In welding process, according to the wall thickness of producing stainless steel tube, determine the parameters such as the attitude of a TIG welding gun and welding current, arc voltage, and the pool size formed with this regulate the 2nd TIG welding gun attitude and and a TIG welding gun between distance and the technological parameters such as welding current, arc voltage, in order to reach the welding production that best appearance of weld effect is carried out steel pipe.
The beneficial effect of this invention
High speed, the efficient welding production of thin-walled (wall thickness≤3mm) steel pipe can be realized by this welding technique, the high speed backing welding that the thick walled steel tube multilayer welding is delivered a child in producing can also be realized.This welding technique does not need the special design welder, only need be on original steel-pipe welding production line, be close to original TIG welding gun back and install one the equal adjustable TIG welding gun of posture position, by regulating distance and Proper Match two TIG arc voltage and the welding currents between two TIG welding guns, just can realize that the high-speed and high-efficiency welding of steel plate is produced.In addition, this welding technique not only can be realized the high-speed welding production of thin-wall steel tube, can also realize the high-speed welding production of the nonferrous metal tubes such as high speed backing welding in thick walled steel tube multi-pass welding welding production process and aluminium alloy, titanium alloy, magnesium alloy.Use this welding technique, during stainless steel tube after 1.2mm is produced, under the speed of welding of 5m/min, can production department's appearance of weld good, up to standard, the steel pipe that weld properties meets the demands, double T IG welding gun high-speed welding face of weld pattern is shown in accompanying drawing 3.
The accompanying drawing explanation
Fig. 1 is welder structure chart of the present invention;
Fig. 2 realizes by this welding method the schematic diagram that the thick stainless pipe welding of 1.2mm is produced;
Fig. 3 is double T IG welding gun high-speed welding appearance of weld pattern (speed of welding: 5.6m/min, wall thickness: 1.5mm);
In figure: 1, a TIG welding gun, 2, a TIG torch neck, 3, a TIG welding gun tungsten electrode, the 4, the one TIG electric arc, 5, the welding steel pipe (or nonferrous metal tube), 6, the 2nd TIG welding gun, 7, the 2nd TIG torch neck, the 8, the 2nd TIG welding gun tungsten electrode, the 9, the 2nd TIG electric arc, 10, weld seam, 11, welding direction.
The specific embodiment
A kind of thin-wall steel tube high-speed welding process units, comprise steel pipe conveying device, downhand welding welder, former and later two TIG sources of welding current independently that the downhand welding welder is included in that welding position arranges, two TIG sources of welding current produce respectively a TIG electric arc 4 and the 2nd TIG electric arc 9, between the 2nd TIG welding gun 6 and a TIG welding gun 1, distance is 0-60mm, the 2nd TIG welding gun 6 is at a TIG welding gun 1 in same plane, and two welding guns become 0-90 ° of angle.
Embodiment 1
Below with the thick stainless steel tube welding of 1.2mm, produce welding procedure and result are carried out to analytic explanation.
Two TIG sources of welding current used, one is the digital inversion direct current source of welding current, for a TIG electric arc provides the energy; Another is the common inversion direct current source of welding current, for the 2nd TIG electric arc provides the energy.The one TIG arc welding electric current is 192A, and arc voltage is 16.2V, and protection gas is Ar gas, and flow is 6L/min; The 2nd TIG arc welding electric current is 124A, and arc voltage is 15.8A, the protection gas Ar gas that is the 5L/min flow, and the distance between two welding gun tungsten electrodes is 7mm, speed of welding is 5.1m/min; The angle of two welding guns is 30 °, and the stainless steel tube wall thickness is 1.2mm.Two TIG welding guns maintain static, and welding position is from the joint downhand welding of steel pipe outside.Stainless steel band is through being rolled into the circular steel tubulose after shaping, continuously carry welding position, the one TIG arc welding is first arranged, make the complete penetration of weld seam and guarantee that the back side has good shaping, the molten bath afterbody formed at a TIG electric arc the 2nd TIG electric arc liquid towards molten bath of igniting continues to heat, make it continue to keep liquid, thereby can there is time enough to reflux, extravagant, fill the depression that molten bath forms, obtain smooth continuous weld seam, the steel pipe welded carries out the full circle processing until weld seam after cooling a period of time, then size intercepts production tube in accordance with regulations.6 meters long steel pipes, its productive temp can reach 1 minute and 11 seconds/.
To adopting the steel pipe that this welding procedure is produced to do the experiment of expanding, result shows all not to find that through macroscopic view monitoring and surface colour flaw detection steel pipe ftractures, and meets the company standard of expansion rate 10% fully under expansion rate reaches 15.2% condition.
The welding procedure step that the round steel pipe of take is produced steel pipe as example explanation double T IG welding gun:
1, steel-pipe welding is manufactured and is adopted frock clamp by the vertical shaping of steel band, and cross section is circular, and the both sides level docking of steel band, so that adopt the mode welding fabrication of downhand welding.
2, welding procedure adopts that row before and after two TIG welding guns are put, the mode of filler wire not, the one TIG electric arc is guaranteed weld seam complete penetration and is guaranteed the appearance of weld of steel pipe internal-surface, the rear portion, molten bath the one TIG electric arc formed with the 2nd TIG electric arc is thereafter heated, and guarantees that the outer surface of steel tube smooth welded seam is continuous.
3, the method is used the TIG source of welding current of two platform independent, and two power supplys both can the same model same specification, also can the different model different size; Can be both digital welding power source, can be also that common Inverter TIG Welding connects power supply, the IGCT TIG source of welding current.
4, two TIG Arc Welding Process parameter coordinations are controlled: the stainless steel wall thickness is 1.5mm, speed of welding is 6.1m/min, the attitude that the horizontal butt weld of the one TIG welding gun and steel pipe is 85 °, according to the wall thickness of producing steel pipe, the welding current of determining a TIG electric arc is at 270A, arc voltage between 16.5V, and the most advanced and sophisticated distance to the butt joint edge upper surface of tungsten electrode is 0.3mm.The attitude that the pool size formed according to a TIG electric arc and appearance of weld are regulated the 2nd TIG welding gun for and the horizontal butt welding of steel pipe to be seamed into welding current that 70 °, the 2nd TIG welding gun and distance between a TIG welding gun are 8mm, the 2nd TIG electric arc be 156A, the arc voltage technological parameter such as be 17.1V, tungsten electrode most advanced and sophisticated to the butt joint edge upper surface apart from being 0.5mm.
5, steel pipe seam carries out the full circle processing after being cooled to below 400 ℃, and then packing is put in storage after the assay was approved.
The mother metal that the method is used can be both stainless steel material, also can carbon steel, the non-ferrous metals such as the ferrous metal such as steel alloy and aluminium alloy, to weld steel pipe and the nonferrous metal tube produced can be round tube, rectangular tube and other shape tubes.
Below with the thick stainless steel tube welding of 2.0mm, produce welding procedure and result are carried out to analytic explanation.
Two TIG sources of welding current used, one is the digital inversion direct current source of welding current, for a TIG electric arc provides the energy; Another is the common inversion direct current source of welding current, for the 2nd TIG electric arc provides the energy.The one TIG arc welding electric current is 285A, and arc voltage is 16.8V, and protection gas is Ar gas, and flow is 6L/min; The 2nd TIG arc welding electric current is 172A, and arc voltage is 16A, the protection gas Ar gas that is the 6L/min flow, and the distance between two welding gun tungsten electrodes is 9.0mm, speed of welding is 4.8m/min; The angle of two welding guns is 35 °, and the stainless steel tube wall thickness is 2.0mm.Two TIG welding guns maintain static, and welding position is from the joint downhand welding of steel pipe outside.Stainless steel band is through being rolled into the circular steel tubulose after shaping, continuously carry welding position, the one TIG arc welding is first arranged, make the complete penetration of weld seam and guarantee that the back side has good shaping, the molten bath afterbody formed at a TIG electric arc the 2nd TIG electric arc liquid towards molten bath of igniting continues to heat, make it continue to keep liquid, thereby can there is time enough to reflux, extravagant, fill the depression that molten bath forms, obtain smooth continuous weld seam, the steel pipe welded carries out the full circle processing until weld seam after cooling a period of time, then size intercepts production tube in accordance with regulations.6 meters long steel pipes, its productive temp can reach 1 minute and 15 seconds/.
Claims (3)
1. a thin-wall steel tube high-speed welding production technology, it is characterized in that, stainless steel band is rolled into to steel pipe shape through shaping and is delivered to continuously welding position, the place, welding position arranges former and later two TIG sources of welding current, first through a TIG arc welding, make weld seam complete penetration and guarantee the appearance of weld of steel pipe internal-surface, with the rear portion, molten bath the one TIG electric arc formed by the 2nd TIG electric arc, heated, guarantee that the outer surface of steel tube smooth welded seam is continuous, speed of welding is 1.0-8.0m/min, thickness of steel pipe scope 0.5-6mm, a described TIG electric arc is produced by a TIG welding gun, the 2nd TIG electric arc is produced by the 2nd TIG welding gun, between described the 2nd TIG welding gun and a TIG welding gun, distance is 0-60mm, a described TIG welding gun is seamed into the attitude of 40-90 ° of angle in steel pipe butting grooves plane with the horizontal butt welding of steel pipe, the welding current of the one TIG electric arc is at 30-400A, arc voltage between 10-40V, and the most advanced and sophisticated distance to the butt joint edge upper surface of tungsten electrode is 0.1-5mm, described the 2nd TIG welding gun is seamed into 60-90 ° of angle with the horizontal butt welding of steel pipe in steel pipe butting grooves plane, and the welding current of the 2nd TIG electric arc is that 30-350A, arc voltage are 10-40V, and the most advanced and sophisticated distance to the butt joint edge upper surface of tungsten electrode is 0.1-5mm.
2. thin-wall steel tube high-speed welding production technology according to claim 1, is characterized in that, described steel pipe is round tube or rectangular tube or oval pipe.
3. be applied in the device in technique claimed in claim 1, comprise steel pipe conveying device, downhand welding welder, it is characterized in that, former and later two TIG sources of welding current independently that described downhand welding welder is included in that welding position arranges, two TIG sources of welding current produce respectively a TIG electric arc and the 2nd TIG electric arc; The 2nd TIG welding gun and a TIG welding gun are in same plane, and between two welding guns, distance is 0-60mm, becomes 0-90 ° of angle.
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| CN106312262A (en) * | 2016-10-20 | 2017-01-11 | 西安华杰管道有限公司 | TIG welding technique for butt welding of thin-walled stainless steel tubes |
| CN107127586A (en) * | 2017-06-06 | 2017-09-05 | 宁波百德满不锈钢有限公司 | A kind of stainless steel tube production method for being used to produce air-conditioning hush pipe |
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| CN110238485A (en) * | 2019-05-14 | 2019-09-17 | 江苏圣珀新材料科技有限公司 | A kind of welding method of tubular material inside weld |
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| JPS592584B2 (en) * | 1976-07-14 | 1984-01-19 | 株式会社日立製作所 | Front lap fillet weld |
| JPS5611185A (en) * | 1979-07-09 | 1981-02-04 | Nippon Kokan Kk <Nkk> | Tig welding method of 9% nickel steel |
| JP2844836B2 (en) * | 1990-04-27 | 1999-01-13 | いすゞ自動車株式会社 | Method and apparatus for modifying surface of metal parts |
| CN1418753A (en) * | 2002-12-17 | 2003-05-21 | 陈彦宾 | Welding method coordinately controlled by laser-electric arc compound pulsation |
| CN101817112A (en) * | 2010-05-17 | 2010-09-01 | 哈尔滨工业大学 | Single power supply single-surface serial double-TIG (Tungsten Inert Gas) arc welding method |
| CN101954543B (en) * | 2010-08-04 | 2013-01-09 | 机械科学研究院哈尔滨焊接研究所 | Non-splash, low-deformation, high-quality and high-efficiency welding method for T-shaped joint of aluminum alloy sheet |
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