CN102717171B - Plug welding repair technology for mammoth converter shell perforation - Google Patents
Plug welding repair technology for mammoth converter shell perforation Download PDFInfo
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- CN102717171B CN102717171B CN201210225756.7A CN201210225756A CN102717171B CN 102717171 B CN102717171 B CN 102717171B CN 201210225756 A CN201210225756 A CN 201210225756A CN 102717171 B CN102717171 B CN 102717171B
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Abstract
The invention discloses a plug welding repair technology for a mammoth converter shell perforation, the technological method is that rust, greasy dirt, slag oxide and other sundries within the 200-millimeter scope at the periphery of a plug welding area are completely cleared up; a welding line back plate is welded at the outer part of a converter shell plug welding opening, and meanwhile, a heating sheet is hung for weld preheating; the inner part of a converter body is subjected to welding, the manual arc welding is firstly used for plug welding 1/3 depth, and then, the CO2 gas shield welding is used for plug welding; and postheat treatment is instantly carried out after completing the seam welding. The repair technology is simple to operate, and easy to carry out; and the production efficiency is high, and the welding quality is reliable.
Description
Technical field
The present invention relates to a kind of low, medium carbon steel, the main equipment local welding renovation technique that Hi-Stren steel is made.
Technical background
Mammoth conveter, in the process of steel-making, in the time that the refractory brick in converter damages, is easy to cause converter shell to burn.If dealt with improperly in REPAIR WELDING converter burning hole, restoring area tends to become the cradle that converter shell destroys.At present, in the restorative procedure of large converter shell burning hole, relatively more conventional is that part is mended welding method by replacing a damaged part.The workload of this welding repair method is often larger, complex process, and in the larger situation of furnace shell thickness, when single-sided welding, welding stress is large, easily cracks.
Summary of the invention
The object of the invention is to provide a kind of large converter shell perforation plug welding and restoring process, and this repair process is simple to operate, easy to implement, and efficiency is high, reliable in quality.
For realizing the object of the invention, large converter shell perforation plug process method for welding and repairing of the present invention is as follows:
1, welding manner: adopt manual electric arc welding+CO
2gas is protected weldering plug welding, and attenuate position is for adopting CO
2gas is protected weldering built-up welding.
2, welding material: manual metal-arc welding adopts J507 ultralow hydrogen type electrode, specification φ 3.2, φ 4.0, power acquisition DC reverse connection.
3, weld preheating: welding is front by clean the eliminating impurities such as the iron rust within the scope of 200mm around plug welding region, greasy dirt, slag oxide; Welding equipment weld seam backing plate outside furnace shell plug welding hole, mounts heating plate simultaneously and carries out weld preheating.
4, welding: furnace body inside welding, first by manual electric arc welding plug welding 1/3 degree of depth, then by CO
2gas is protected weldering plug welding; When welding, interlayer temperature is controlled at 200～240 DEG C of left and right, and welding slag is between layers removed clean, and processing step is identical when every layer of welding; Welding is taked to work continuously in shifts for 24 hours, must not pause, and guarantee that whole weld seam is in keeping warm mode all the time before having welded.
5, postwelding after-baking: should carry out immediately after-baking after weld seam is soldered, cover electric heating sheets at plug weld position, the insulation of outsourcing asbestos, programming rate is by≤50 DEG C/h, in the time of 300 DEG C, be incubated 2 hours, then by the speed slow cooling of≤50 DEG C/h, remove insulation and electric heater unit after being down to normal temperature.
The local damage (penetrability is destroyed in size 200mm) that renovation technique of the present invention produces for steel melting converter shell, its process is simple to operate, easy to implement; And production efficiency is high, reliable welding quality.
Detailed description of the invention
Taking 300 tons of converter shell burning hole REPAIR WELDING as example, large converter shell perforation plug welding and restoring process of the present invention is described below, concrete grammar is as follows:
1) welding method: adopt manual electric arc welding+CO
2gas is protected weldering plug welding, and attenuate position is for adopting CO
2gas is protected weldering built-up welding.
2) welding sequence: furnace body inside welding, first by manual electric arc welding plug welding 1/3 degree of depth, then by CO
2gas is protected weldering plug welding.
3) welding material: manual metal-arc welding adopts J507 ultralow hydrogen type electrode, specification φ 3.2, φ 4.0, power acquisition DC reverse connection.J507 ultralow hydrogen type electrode weldering is dried, and temperature 350-400 DEG C, is incubated 2 hours, and the welding rod having dried is placed in the heat-preservation cylinder of 100 DEG C, ready access upon use.The welding rod making moist is forbidden to use.
4) welding equipment: CO
2gas shielded arc welding adopts FKR-500 welding machine, and manual electric arc welding adopts ZX7-400 welding machine.
5) welding condition
6) weld preheating
Welding is front by clean the eliminating impurities such as the iron rust within the scope of 200mm around plug welding region, greasy dirt, slag oxide.The weld seam backing plate of welding equipment δ 8 × 30 outside furnace shell plug welding hole, mounts heating plate simultaneously and carries out weld preheating.180～200 DEG C of preheat temperatures, are heating region within the scope of the 50～300mm of weld seam both sides, mode of heating, the heating of crawler type electric heating sheets.
7) in welding time,, interlayer temperature is controlled at 200～240 DEG C of left and right, and welding slag between layers must be removed totally, and every layer of processing step while welding is identical.Welding is taked to work continuously in shifts for 24 hours, must not pause, and guarantee that whole weld seam is in keeping warm mode all the time before having welded.
Speed of welding is controlled according to the fusion situation of weld seam and mother metal oneself, and after welding, face of weld must not have the defects such as crackle, slag inclusion, pore.
8) postwelding after heat and stress relief annealing processing
After being soldered, weld seam should carry out immediately after-baking; Cover electric heating sheets at plug weld position, the insulation of the thick asbestos of outsourcing 50 ㎜, programming rate, by≤50 DEG C/h, is incubated 2 hours in the time of 300 DEG C, then by the speed slow cooling of≤50 DEG C/h, removes insulation and electric heater unit after being down to normal temperature.(intensification and cooling rate are set according to thickness of slab).
If the engineering time allows suggestion to use PWHT of stress relieving.The heat treatment detailed process that eliminates stress is on the basis of after heat, to be slowly warming up to 600 DEG C, is incubated 2 hours, then presses the speed slow cooling of≤50 DEG C/h.For larger plug welding point holding time to 4～5 of welding stress hour in case detent plug solder joint and overlaying layer stripping and come off.
9) postwelding removing surface: postwelding is removed all temporary supportings of face of weld and peripheral region, crator, spatter thing etc. is clean with electric angle grinder polishing.
10) postwelding inspection: find no the existence of the weld defects such as crackle, overlap, pore, slag inclusion through visual examination, use MT+UT butt welded seam to carry out inside and detect, flaw detection is carried out by JB/T4730-2005 requirement, and MT acceptance requirement is
level is qualified, and UT acceptance requirement is
level is qualified.
Claims (3)
1. a large converter shell perforation plug welding and restoring process, method is as follows:
1), welding manner: adopt manual electric arc welding+CO
2gas is protected weldering plug welding, and attenuate position is for adopting CO
2gas is protected weldering built-up welding;
2), welding material: manual metal-arc welding adopts ultralow hydrogen type electrode, diameter phi 3.2-φ 4.0, power acquisition DC reverse connection;
3), weld preheating: welding is front by clean the eliminating impurities such as the iron rust within the scope of 200mm around plug welding region, greasy dirt, slag oxide; Welding equipment weld seam backing plate outside furnace shell plug welding hole, mounts heating plate simultaneously and carries out weld preheating;
4), welding: furnace body inside welding, first by manual electric arc welding plug welding 1/3 degree of depth, then by CO
2gas is protected weldering plug welding; When welding, interlayer temperature is controlled at 200～240 DEG C of left and right, and welding slag is between layers removed clean, and processing step is identical when every layer of welding; Welding is taked to work continuously in shifts for 24 hours, must not pause, and guarantee that whole weld seam is in keeping warm mode all the time before having welded;
5), postwelding after heat and stress relief annealing: should carry out immediately after-baking after weld seam is soldered, cover electric heating sheets at plug weld position, the insulation of outsourcing asbestos, programming rate is by≤50 DEG C/h, in the time of 300 DEG C, be incubated 2 hours, then by the speed slow cooling of≤50 DEG C/h, remove insulation and electric heater unit after being down to normal temperature.
2. large converter shell perforation plug welding and restoring process according to claim 1, is characterized in that: CO
2gas shielded arc welding adopts FKR-500 welding machine, and manual electric arc welding adopts ZX7-400 welding machine.
3. large converter shell perforation plug welding and restoring process according to claim 1, it is characterized in that: heat treatment eliminates stress on postwelding after-baking basis, the heat treatment that eliminates stress is on the basis of after heat, to be slowly warming up to 600 DEG C, temperature retention time 2 hours, then presses the speed slow cooling of≤50 DEG C/h; For the larger plug welding point of welding stress, holding time to 4～5 hour are in case detent plug solder joint and overlaying layer stripping and come off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210225756.7A CN102717171B (en) | 2012-07-03 | 2012-07-03 | Plug welding repair technology for mammoth converter shell perforation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210225756.7A CN102717171B (en) | 2012-07-03 | 2012-07-03 | Plug welding repair technology for mammoth converter shell perforation |
Publications (2)
| Publication Number | Publication Date |
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| CN102717171A CN102717171A (en) | 2012-10-10 |
| CN102717171B true CN102717171B (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210225756.7A Expired - Fee Related CN102717171B (en) | 2012-07-03 | 2012-07-03 | Plug welding repair technology for mammoth converter shell perforation |
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| CN103028813B (en) * | 2012-12-19 | 2015-05-13 | 马鞍山马钢设备安装工程有限公司 | Welding repair method for local damage of G42CrMo4N cold rolling shaft sleeve |
| CN103481008B (en) * | 2013-09-05 | 2017-01-25 | 通裕重工股份有限公司 | Deep-hole repair welding technology |
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| CN105817745A (en) * | 2016-04-13 | 2016-08-03 | 马鞍山十七冶工程科技有限责任公司 | Welding method for field installation circumferential weld of converter shell |
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| CN107598334B (en) * | 2017-10-25 | 2019-07-05 | 安徽马钢设备检修有限公司 | Double online welding and restoring process of material axial workpiece |
| CN109894721A (en) * | 2017-12-07 | 2019-06-18 | 江门市新会区同达化工机械制造有限公司 | A kind of pressure vessel process method for welding and repairing |
| CN108994419B (en) * | 2018-08-20 | 2020-12-25 | 江苏科技大学 | Composite surfacing manufacturing method for perforation needle |
| CN109249180A (en) * | 2018-09-21 | 2019-01-22 | 大连德宇机械有限公司 | Mixer screw rod renovation technique |
| CN110653450B (en) * | 2019-08-01 | 2021-06-25 | 广东韶钢松山股份有限公司 | Online repairing method for converter body perforation |
| CN112935480B (en) * | 2021-03-25 | 2022-06-03 | 安徽马钢设备检修有限公司 | Repairing process for surface abrasion of large wheel fixing table base |
| CN113369732B (en) * | 2021-05-27 | 2024-02-09 | 河钢股份有限公司承德分公司 | Heat treatment welding method for converter shell |
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| JPH05104246A (en) * | 1991-10-08 | 1993-04-27 | Nkk Corp | Plug welding method |
| JPH07241668A (en) * | 1994-03-04 | 1995-09-19 | Nippon Steel Corp | Method for plug welding of stainless steel by flux-cored wire |
| JPH11314154A (en) * | 1998-04-30 | 1999-11-16 | Honda Motor Co Ltd | Plug welding method of aluminum work |
| JP2005238262A (en) * | 2004-02-25 | 2005-09-08 | Fuji Heavy Ind Ltd | Plug welding method for steel sheet |
| CN101259567A (en) * | 2008-04-25 | 2008-09-10 | 哈尔滨工业大学 | Method for using ultrasonic vibration to process plug welding porous structure aluminium base composite material |
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2012
- 2012-07-03 CN CN201210225756.7A patent/CN102717171B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05104246A (en) * | 1991-10-08 | 1993-04-27 | Nkk Corp | Plug welding method |
| JPH07241668A (en) * | 1994-03-04 | 1995-09-19 | Nippon Steel Corp | Method for plug welding of stainless steel by flux-cored wire |
| JPH11314154A (en) * | 1998-04-30 | 1999-11-16 | Honda Motor Co Ltd | Plug welding method of aluminum work |
| JP2005238262A (en) * | 2004-02-25 | 2005-09-08 | Fuji Heavy Ind Ltd | Plug welding method for steel sheet |
| CN101259567A (en) * | 2008-04-25 | 2008-09-10 | 哈尔滨工业大学 | Method for using ultrasonic vibration to process plug welding porous structure aluminium base composite material |
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| 刘宏敏.孔塞焊工艺探讨.《机械工程师》.2007,(第06期),145,146. * |
| 孔塞焊工艺探讨;刘宏敏;《机械工程师》;20070610(第06期);145,146 * |
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Address after: 243000 Taibai Avenue 1889, Ma'anshan Economic and Technological Development Zone, Ma'anshan City, Anhui Province Co-patentee after: MAGANG (Group) HOLDING Co.,Ltd. Patentee after: ANHUI MASTEEL ENGINEERING & TECHNOLOGY GROUP Co.,Ltd. Address before: 243000 First Floor, No. 259 South Road, Huxi Avenue, Ma'anshan Economic and Technological Development Zone, Anhui Province Co-patentee before: MAGANG (Group) HOLDING Co.,Ltd. Patentee before: Maanshan Magang Equipment Installation Engineering Co.,Ltd. |
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Effective date of registration: 20190709 Address after: 243000 Taibai Avenue 1889, Ma'anshan Economic and Technological Development Zone, Ma'anshan City, Anhui Province Patentee after: ANHUI MASTEEL ENGINEERING & TECHNOLOGY GROUP Co.,Ltd. Address before: 243000 Taibai Avenue 1889, Ma'anshan Economic and Technological Development Zone, Ma'anshan City, Anhui Province Co-patentee before: MAGANG (Group) HOLDING Co.,Ltd. Patentee before: ANHUI MASTEEL ENGINEERING & TECHNOLOGY GROUP Co.,Ltd. |
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Granted publication date: 20141210 |