CN102717174A - Argon tungsten-arc repair welding method based on activated flux - Google Patents
Argon tungsten-arc repair welding method based on activated flux Download PDFInfo
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Abstract
The invention discloses an argon tungsten-arc repair welding method based on activated flux. The argon tungsten-arc repair welding method based on activated flux is suitable for low-alloy high-strength steel, low-alloy ultra-high-strength steel and stainless steel. The argon-arc welding activated flux of a low-carbon steel tungsten electrode is mixed into paste with acetone, and is coated at the part of a workpiece, which is to be repair-welded; argon tungsten-arc welding is adopted to carry out the repair welding treatment at the part of the workpiece, which is to be repair-welded and is coated with the activated flux; and when the workpiece is made by high-strength steel or ultra-high-strength steel, stress removal annealing treatment is carried on the whole repair-welded workpiece. The activated flux which is adopted during the repair welding process of the technology can improve the arc energy density; compared with the traditional repair welding technology, the method has the advantages that the weld heat input amount is reduced by about 50%, the repair welding deformation is reduced by about 40%, and the repair welding efficiency is improved to about 100%; the repair welding technological process with high efficiency, high performance and low deformation can be realized; and the method has the characteristics of simplicity and convenience in operation.
Description
Technical field
The present invention relates to adopt the argon tungsten-arc welding repair welding of activated rosin flux, is a kind of weld seam repair welding technology of high quality and high efficiency.
Background technology
All kinds of weld defects are difficult to avoid fully in the Metal Material Welding process, have the defect repair welding problem for the higher weld seam of quality requirement.Traditional repair method is " repair welding again fills silk after the first defective troubleshooting ", that is: x-ray inspection confirm defective locations → instrument polishing welding seams defectives such as employing emery wheel → polishing back to place to be welded clear up → wlding is filled in defective polishing hole to carry out repair welding → carry out in case of necessity stress-removal annealing in process → x-ray inspection and confirms that defective gets rid of.Owing to need defective in the weld seam be got rid of fully with instruments such as emery wheels; Inevitably must rejected region be enlarged several times even tens of times; And follow-up conventional repair welding operation of carrying out, problem such as exist local heat to cause that seam deformation is big, the repair welding quality is subject to the wlding quality influence, process of patch weld is complicated, repair welding efficient is on the low side and labor strength is big.
The sixties in last century, the institute of welding early start research of former Soviet Union's crust increases the tungsten electrode argon-arc welding seam fusion penetration, reduces the argon tungsten-arc welding activated rosin flux because of material composition influence of fluctuations weld penetration.Phase at the end of the nineties in last century is domestic to begin to carry out correlation test research, develops the argon tungsten-arc welding activated rosin flux of non-ferrous metals such as being applicable to all kinds of steel such as structural carbon steel, low-alloy high-strength steel, unimach, stainless steel and aluminium alloy, titanium alloy in succession.
The argon tungsten-arc welding activated rosin flux of welding penetration " increase " (CN 15559557A), " a kind of activating agent that is used for low-carbon steel argon tungsten-arc welding " (CN1439478A), " a kind of activated rosin flux that is used for the stainless steel argon arc welding " (CN1439479A) etc. patent of invention describes, the formula components and the preparation method of the argon tungsten-arc welding activated rosin flux that is applicable to all kinds of common steel grades increase weld penetrations of increase is provided.Do not do in purposes aspect the weld defect repair welding for activated rosin flux and to expand and to mention.Patent of invention " a kind of method of eliminating aluminum casting repairing welding gas hole defect " (CN101497146A) has been introduced the process that adopts activated rosin flux elimination aluminum casting repairing welding gas hole, and this changes traditional repair welding that process has been continued to use " repair welding again fills silk after the first defective troubleshooting ".The technical process that the described employing activated rosin flux of this patent is eliminated aluminum casting repairing welding gas hole is: rationally offer groove according to the foundry goods genetic defects, guarantee the wall light, no burr, greasy dirt, dirt; Adopt acetone that welding zone is cleaned up before the weldering, and carry out preheating according to conditions such as foundry goods shape, wall thickness; Welding wire is washed; The pasty state solder flux that prior water is mixed up is coated on groove face equably, or implements welding immediately with picking the proper amount of dry solder flux after the welding wire one end stewing heat; Postwelding cleans up welding zone surface flux residue with hot water immediately; For multilayer welding, clean out flux between every layer earlier, carry out lower floor's welding again.This patent is only mentioned the repair welding technology to the aluminium casting gas hole defect, does not relate to adopting activated rosin flux to carry out the repair welding technology of stainless steel, high-strength steel and unimach weld defect.Because this patent is primarily aimed at the aluminium casting gas hole defect and carries out repair welding; Need to carry out repair welding behind the bevel; This process is not suitable for the material weld defect repair weldings such as stainless steel, high-strength steel and unimach of thin-walled and medium wall thickness because of labour intensity is big, repair welding efficient is low.The water that adopted in this patent simultaneously is in harmonious proportion the method for activated rosin flux, can increase weld porosity defective or crack defect to a certain extent and produce probability, need be in harmonious proportion solvent to activated rosin flux and improve and innovate.And simmer with welding wire one end that to pick the quality and the repair welding quality that pick activated rosin flux in the process that the proper amount of dry solder flux implements to weld immediately after the heat wayward described in this patent, be not suitable for the material weld defect repair weldings such as stainless steel, high-strength steel and unimach of thin-walled and medium wall thickness.Though have commercially available owing to be applicable to the activated rosin flux of stainless steel, high-strength steel and unimach argon arc welding welding; But its prescription and proportioning are still unexposed; This technology welding field is at home popularized application as yet in an all-round way, and therefore public reported and the patent application that activated rosin flux is used for stainless steel, high-strength steel and the repair welding of unimach weld defect do not arranged at present as yet.
Summary of the invention
The labour intensity that exists in the prior art is big, repair welding efficient is low in order to overcome, workpiece deformation is big after the repair welding; Be not suitable for stainless steel, high-strength steel and the ultrahigh-strength steel thin-wall of thin-walled and medium wall thickness and the deficiency of medium wall thickness workpiece weld defect repair welding, the present invention proposes a kind of argon tungsten-arc welding repair method based on activated rosin flux.
Argon tungsten-arc welding repair method based on activated rosin flux of the present invention is applicable to Hi-Stren steel, low-alloy super-strength steel and stainless steel thin-wall and the repair welding of medium wall thickness workpiece weld defect, specifically may further comprise the steps:
Step 1, butt welded seam carries out apparent processing;
Step 2 is treating that repair welding place applies activated rosin flux; The argon tungsten-arc welding activated rosin flux is reconciled into pasty state with acetone, and the volume ratio of said argon tungsten-arc welding activated rosin flux and acetone is 1:3; The pasty state argon tungsten-arc welding activated rosin flux of modulation is coated in repair welding place of treating of workpiece; Coating thickness is advisable to cover the former weld seam parent metal of workpiece look;
Step 3 treats that to workpiece repair welding place carries out repair welding; Adopt argon tungsten-arc welding that repair welding is carried out in repair welding place of treating that has applied activated rosin flux on the workpiece; Not sealing weld silk during repair welding; The technological parameter of repair welding is: welding current 120～230A, weldingvoltage 9～15V, speed of welding 90～160mm/min; For high strength steel and unimach, with conventional oxyacetylene torch after-baking is carried out in repair welding place immediately after the repair welding, postheat temperature is 200～300 ℃, the time of after-baking is 20～30min; When workpiece is high strength steel or unimach, to the whole workpiece stress-removal annealing in process after the repair welding; The stress-removal parameter and annealing is after the repair welding: the annealing holding temperature is that 630～690 ℃, temperature retention time are 70～100min, and workpiece is come out of the stove the back air cooling to room temperature; Obtain workpiece through repair welding;
Step 4, x-ray inspection detects.
When gas hole defect was distributed in the weld seam both sides, the swing arc mode was adopted in described argon tungsten-arc welding based on activated rosin flux, and the swinging arc fabric width should be advisable to cover former weld width, and the swinging arc frequency is 3～5Hz.
The present invention adopts and based on the argon tungsten-arc welding of activated rosin flux stainless steel, high-strength steel, ultrahigh-strength steel thin-wall and the common weld defect of medium wall thickness structural member is carried out repair welding, need not to carry out the weld defect troubleshooting before the repair welding and handles, and has reduced the repair welding scope and the degree of depth; The activated rosin flux that adopts can improve arc energy density, and comparing traditional handicraft, can to reduce process of patch weld sweating heat input quantity about 50%, and it is about 40% to reduce workpiece repair welding deflection, improves repair welding efficient about 100%.Can realize the repair welding process of high efficiency, high-performance, low distortion, and have characteristics simple to operation.
Description of drawings
Accompanying drawing 1 is indication process of patch weld sketch map of the present invention;
Accompanying drawing 2 is a flow chart of the present invention.
The specific embodiment
Embodiment 1
Present embodiment is a kind of Hi-Stren steel pressure vessel argon tungsten-arc welding repair method based on activated rosin flux.
In the present embodiment, be the Hi-Stren steel pressure vessel by the workpiece of repair welding, diameter phi 1200mm, wall thickness 3.2mm, material 30CrMnSiA high strength steel, strength of materials rank is 1000MPa.Adopt the argon tungsten-arc welding postwelding, find to have the many places crackle in the girth joint through x-ray inspection.The activated rosin flux that is adopted is the low-carbon steel argon tungsten-arc welding activated rosin flux that Xi'an Aerospacemotor Machine Factory produces, and through argon tungsten-arc welding the gas hole defect in the said Hi-Stren steel pressure tight seam is carried out repair welding and handles, and concrete repair welding step is:
Step 1, butt welded seam carries out apparent processing.Adopt conventional method rejected region in the Hi-Stren steel pressure tight seam to be carried out apparent cleaning with wire wheel.
Step 2 is treating that repair welding place applies activated rosin flux.The low-carbon steel argon tungsten-arc welding activated rosin flux is reconciled into pasty state with acetone, and the volume ratio of said low-carbon steel argon tungsten-arc welding activated rosin flux and acetone is 1:3.The pasty state low-carbon steel argon tungsten-arc welding activated rosin flux of modulation is coated in flat banister brush and treats repair welding place, and coating thickness is advisable to cover former weld seam parent metal look.
Step 3 treats that to workpiece repair welding place carries out repair welding.Adopt argon tungsten-arc welding that repair welding is carried out in repair welding place of treating that has applied activated rosin flux on the workpiece; Not sealing weld silk during repair welding.The technological parameter of repair welding is: welding current 100～140A, weldingvoltage 9～12V, speed of welding 90～120mm/min.In the present embodiment, welding current 140A, weldingvoltage 10V, speed of welding 110mm/min.Postwelding carries out after-baking with conventional oxyacetylene torch to repair welding place immediately, to reduce the cold cracking inclination of workpiece; Postheat temperature is 200 ℃, and the time is 20min.After the workpiece repair welding, it is carried out whole stress-removal annealing in process in the stove.The stress-removal parameter and annealing is after the repair welding: the annealing holding temperature is that 630 ℃, temperature retention time are 70min, and the back air cooling of coming out of the stove is to room temperature.Obtain workpiece through repair welding.
Step 4, x-ray inspection detects.After clearing up the repair welding place surface of annealed processing, carry out x-ray inspection and detect, confirm that the crackle gas hole defect is got rid of fully in the weld seam.Weld seam inherent quality and the requirement of apparent mass accord with Q J1842-95I level weld seam.
Embodiment 2
Present embodiment is a kind of Hi-Stren steel pressure vessel argon tungsten-arc welding repair method based on activated rosin flux.
In the present embodiment, be the Hi-Stren steel pressure vessel by the workpiece of repair welding, diameter phi 1400mm, wall thickness 4.5mm, material 30CrMnSiA high strength steel, strength of materials rank is 1000MPa.Adopt the argon tungsten-arc welding postwelding, the bunchiness gas hole defect of the about φ 1.0mm of diameter that in x-ray inspection discovery girth joint, is scattered here and there in the long scope of about 500mm.The activated rosin flux that is adopted is the low-carbon steel argon tungsten-arc welding activated rosin flux that Xi'an Aerospacemotor Machine Factory produces, and through argon tungsten-arc welding the gas hole defect in the said Hi-Stren steel pressure tight seam is carried out repair welding and handles, and concrete repair welding step is:
Step 1, butt welded seam carries out apparent processing.Adopt conventional method rejected region in the Hi-Stren steel pressure tight seam to be carried out apparent cleaning with wire wheel.
Step 2 is treating that repair welding place applies activated rosin flux.The low-carbon steel argon tungsten-arc welding activated rosin flux is reconciled into pasty state with acetone, and the volume ratio of said low-carbon steel argon tungsten-arc welding activated rosin flux and acetone is 1:3.The pasty state low-carbon steel argon tungsten-arc welding activated rosin flux of modulation is coated in flat banister brush and treats repair welding place, and coating thickness is advisable to cover former weld seam parent metal look.
Step 3 treats that to workpiece repair welding place carries out repair welding.Adopt argon tungsten-arc welding that repair welding is carried out in repair welding place of treating that has applied activated rosin flux on the workpiece; Not sealing weld silk during repair welding.Because weld porosity is distributed in weld seam both sides and former weld seam broad, need adopt electric arc swing mode when adopting the argon tungsten-arc welding repair welding, be beneficial to the pore that is dispersed in the weld seam both sides is eliminated fully.The technological parameter of repair welding is: welding current 120～160A, and weldingvoltage 9～12V, speed of welding 90～120mm/min, electric arc amplitude of oscillation width must be greater than former weld width, frequency 3～5Hz.In the present embodiment, welding current 120A, weldingvoltage 9V, speed of welding 90mm/min, amplitude of oscillation width swinging arc fabric width is 6.0mm, frequency 3Hz.Postwelding carries out after-baking with conventional oxyacetylene torch to repair welding place immediately, to reduce the cold cracking inclination of workpiece; Postheat temperature is 250 ℃, and the time is 25min.After the workpiece repair welding, it is carried out whole stress-removal annealing in process in the stove.The stress-removal parameter and annealing is after the repair welding: the annealing holding temperature is that 650 ℃, temperature retention time are 90min, and the back air cooling of coming out of the stove is to room temperature.Obtain the workpiece after the repair welding of annealed processing.Obtain workpiece through repair welding.
Step 4, x-ray inspection detects.After clearing up the repair welding place surface of annealed processing, carry out x-ray inspection and detect, confirm that gas hole defect is got rid of fully in the weld seam.Weld seam inherent quality and the requirement of apparent mass accord with Q J1842-95I level weld seam.
Embodiment 3
Present embodiment is a kind of low-alloy super-strength steel pressure vessel argon tungsten-arc welding repair method based on activated rosin flux.
In the present embodiment, be the low-alloy super-strength steel pressure vessel by the workpiece of repair welding, diameter phi 2000mm, wall thickness 6.5mm, material is the 31Si2MnCrMoVE unimach, strength of materials rank is 1700MPa.Adopt the automatic tungsten anode argon arc welding postwelding, it is lack of penetration to find that through x-ray inspection many places appear in the girth joint root.Because the product structure restriction can't directly be carried out back chipping and repair welding from back of weld, taked just to handle from weld seam in the face of above-mentioned root of weld incomplete penetration defect carries out repair welding based on the GTAW of activated rosin flux.The activated rosin flux that is adopted is the low-carbon steel argon tungsten-arc welding activated rosin flux that Xi'an Aerospacemotor Machine Factory produces, and through argon tungsten-arc welding to the concrete repair welding step of said low-alloy super-strength steel pressure tight seam defective is:
Step 1, butt welded seam carries out apparent processing.Adopt conventional method rejected region in the low-alloy super-strength steel pressure tight seam to be carried out apparent cleaning with wire wheel.
Step 2 is treating that repair welding place applies activated rosin flux.In the present embodiment, the low-carbon steel argon tungsten-arc welding activated rosin flux is reconciled into pasty state with acetone, the volume ratio of said low-carbon steel argon tungsten-arc welding activated rosin flux and acetone is 1: 3.The pasty state low-carbon steel argon tungsten-arc welding activated rosin flux of modulation is coated in flat banister brush and treats repair welding place, and coating thickness is advisable to cover former weld seam parent metal look.
Step 3 treats that to workpiece repair welding place carries out repair welding.Adopt GTAW that repair welding is carried out in repair welding place of treating that workpiece has applied activated rosin flux; Not sealing weld silk during repair welding.The repair welding parameter is: welding current 190A～210A, and weldingvoltage 12～15V, speed of welding is 110～130mm/min.In the present embodiment, welding current is 210A, weldingvoltage 15V, and speed of welding is 120mm/min.Postwelding carries out after-baking with conventional oxyacetylene torch to repair welding place immediately, to reduce the cold cracking inclination of workpiece; Postheat temperature is 300 ℃, and the time is 30min.After the workpiece repair welding, it is carried out whole stress-removal annealing in process in the stove.The stress-removal parameter and annealing is after the repair welding: the annealing holding temperature is that 690 ℃, temperature retention time are 100min, and workpiece is come out of the stove the back air cooling to room temperature.Obtain workpiece through repair welding.
Step 4, x-ray inspection detects.After clearing up the repair welding place surface of annealed processing, it is carried out x-ray inspection detect, confirm the lack of penetration eliminating fully of the root of weld.Weld seam inherent quality and the requirement of apparent mass accord with Q J175-930 level weld seam.
Embodiment 4
Present embodiment is a kind of stainless steel pressure container argon tungsten-arc welding repair method based on activated rosin flux.
Certain stainless steel pressure container, diameter phi 2800mm, wall thickness 8mm, material 0Cr18Ni9 adopts the automatic tungsten anode argon arc welding postwelding, the continuity longitudinal crack in distribution many places, girth joint centre.The activated rosin flux that adopts is the stainless steel argon arc welding activated rosin flux that Xi'an Aerospacemotor Machine Factory produces, and through argon tungsten-arc welding to the concrete repair welding step of said stainless steel pressure container bead crack defective is:
Step 1, butt welded seam carries out apparent processing.Adopt conventional method rejected region in the low-alloy super-strength steel pressure tight seam to be carried out apparent cleaning with wire wheel.
Step 2 is treating that repair welding place applies activated rosin flux.In the present embodiment, stainless steel argon arc welding activated rosin flux is reconciled into pasty state with alcohol, the volume ratio of said stainless steel steel argon arc welding activated rosin flux and acetone is 1:3.The pasty state stainless steel argon arc welding activated rosin flux of modulation is coated in flat hairbrush and treats repair welding place, and coating thickness is advisable to cover former weld seam parent metal look.
Step 3 is carried out repair welding to repair welding place of treating of workpiece.Adopt GTAW that repair welding is carried out in repair welding place of treating that applies activated rosin flux; Not sealing weld silk during repair welding.The repair welding parameter is: welding current 200～230A, and weldingvoltage 12～15V, speed of welding is 150～180mm/min.In the present embodiment, welding current 230A, weldingvoltage 12V, speed of welding is 160mm/min.Obtain workpiece through repair welding.
Step 4, x-ray inspection detects.Behind the cleaning workpiece repair welding place surface, carry out x-ray inspection and detect, confirm that crack defect is got rid of fully in the weld seam.
Claims (2)
1. the argon tungsten-arc welding repair method based on activated rosin flux is characterized in that, described argon tungsten-arc welding repair method based on activated rosin flux is applicable to Hi-Stren steel, low-alloy super-strength steel and stainless steel, specifically may further comprise the steps:
Step 1, butt welded seam treat that repair welding place carries out apparent processing;
Step 2 is treating that repair welding place applies activated rosin flux; The argon tungsten-arc welding activated rosin flux is reconciled into pasty state with acetone, and the volume ratio of said argon tungsten-arc welding activated rosin flux and acetone is 1:3; The pasty state argon tungsten-arc welding activated rosin flux of modulating is coated in workpiece treats repair welding place; Coating thickness is advisable to cover the former weld seam parent metal of workpiece look;
Step 3 treats that to workpiece repair welding place carries out repair welding; Adopt argon tungsten-arc welding, repair welding is carried out in repair welding place of treating that has applied activated rosin flux on the workpiece; Not sealing weld silk during repair welding; The technological parameter of repair welding is: welding current 120～230A, weldingvoltage 9～15V, speed of welding 90～160mm/min; For high strength steel and unimach, with conventional oxyacetylene torch after-baking is carried out in repair welding place immediately after the repair welding, postheat temperature is 200～300 ℃, the time of after-baking is 20～30min; When workpiece is high strength steel or unimach, to the whole workpiece stress-removal annealing in process after the repair welding; The stress-removal parameter and annealing is after the repair welding: the annealing holding temperature is that 630～690 ℃, temperature retention time are 70～100min, and workpiece is come out of the stove the back air cooling to room temperature; Obtain workpiece through repair welding;
Step 4, x-ray inspection detects.
2. a kind of according to claim 1 argon tungsten-arc welding repair method based on activated rosin flux is characterized in that, when weld porosity was distributed in the weld seam both sides, electric arc swing mode was adopted in described argon tungsten-arc welding repair welding, and amplitude of oscillation width must be greater than former weld width.
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Cited By (9)
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| CN104028984A (en) * | 2014-06-10 | 2014-09-10 | 山东滨州渤海活塞股份有限公司 | Method for manufacturing piston with re-molten reinforced combustion chamber throat |
| CN104668817A (en) * | 2015-01-28 | 2015-06-03 | 辽宁工程技术大学 | Coal ash activated argon arc welding flux and application thereof |
| CN105252109A (en) * | 2015-10-30 | 2016-01-20 | 长治清华机械厂 | Weld crack repair welding method for 30 CrMnSiA welding structural part finished product |
| CN105397245A (en) * | 2015-12-01 | 2016-03-16 | 黑龙江工程学院 | Active hollow-cathode vacuum electric arc welding device and method |
| CN108890089A (en) * | 2018-08-06 | 2018-11-27 | 国网浙江省电力有限公司电力科学研究院 | A kind of electric power aluminum equipment wire clamp welding method |
| CN109530875A (en) * | 2018-12-26 | 2019-03-29 | 无锡市优工精密阀门有限公司 | The method of super-duplex stainless steel casting technique hole welding |
| CN110328492A (en) * | 2019-05-23 | 2019-10-15 | 中国人民解放军第五七一九工厂 | A kind of aero-turbine rear housing supporting plate long crack A-TIG weldering restorative procedure |
| CN112059531A (en) * | 2020-07-24 | 2020-12-11 | 西安航天发动机有限公司 | Method for repairing defects of precision investment casting for liquid rocket engine |
| CN115351391A (en) * | 2022-08-15 | 2022-11-18 | 金鲁鼎焊接(山东)有限公司 | Active argon arc automatic root welding method for stainless steel pipe butt joint |
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| CN104028984A (en) * | 2014-06-10 | 2014-09-10 | 山东滨州渤海活塞股份有限公司 | Method for manufacturing piston with re-molten reinforced combustion chamber throat |
| CN104668817A (en) * | 2015-01-28 | 2015-06-03 | 辽宁工程技术大学 | Coal ash activated argon arc welding flux and application thereof |
| CN104668817B (en) * | 2015-01-28 | 2017-01-11 | 辽宁工程技术大学 | Coal ash activated argon arc welding flux and application thereof |
| CN105252109A (en) * | 2015-10-30 | 2016-01-20 | 长治清华机械厂 | Weld crack repair welding method for 30 CrMnSiA welding structural part finished product |
| CN105397245A (en) * | 2015-12-01 | 2016-03-16 | 黑龙江工程学院 | Active hollow-cathode vacuum electric arc welding device and method |
| CN108890089A (en) * | 2018-08-06 | 2018-11-27 | 国网浙江省电力有限公司电力科学研究院 | A kind of electric power aluminum equipment wire clamp welding method |
| CN109530875A (en) * | 2018-12-26 | 2019-03-29 | 无锡市优工精密阀门有限公司 | The method of super-duplex stainless steel casting technique hole welding |
| CN110328492A (en) * | 2019-05-23 | 2019-10-15 | 中国人民解放军第五七一九工厂 | A kind of aero-turbine rear housing supporting plate long crack A-TIG weldering restorative procedure |
| CN112059531A (en) * | 2020-07-24 | 2020-12-11 | 西安航天发动机有限公司 | Method for repairing defects of precision investment casting for liquid rocket engine |
| CN112059531B (en) * | 2020-07-24 | 2022-04-08 | 西安航天发动机有限公司 | Method for repairing defects of precision investment casting for liquid rocket engine |
| CN115351391A (en) * | 2022-08-15 | 2022-11-18 | 金鲁鼎焊接(山东)有限公司 | Active argon arc automatic root welding method for stainless steel pipe butt joint |
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Application publication date: 20121010 |