CN102717171A - 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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- CN102717171A CN102717171A CN2012102257567A CN201210225756A CN102717171A CN 102717171 A CN102717171 A CN 102717171A CN 2012102257567 A CN2012102257567 A CN 2012102257567A CN 201210225756 A CN201210225756 A CN 201210225756A CN 102717171 A CN102717171 A CN 102717171A
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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 when the refractory brick in the converter damages, is easy to cause converter shell to burn in the process of steel-making.If in REPAIR WELDING converter burning hole, deal with improperly, 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 commonly used is that the part is mended welding method by replacing a damaged part.The workload of this welding repair method is often bigger, complex process, and under the bigger situation of furnace shell thickness, welding stress is big during the single face welding, is easy to generate crackle.
Summary of the invention
The object of the invention provides a kind of large converter shell perforation plug welding and connects renovation technique, and this repair process is simple to operate, easy to implement, and efficient is high, reliable in quality.
For realizing the object of the invention, it is following that large converter shell perforation plug welding of the present invention connects repair process:
1, welding manner: adopt manual electric arc welding+CO
2Gas is protected the weldering plug welding, and the attenuate position is for adopting CO
2Gas is protected the weldering built-up welding.
2, welding material: the J507 ultralow hydrogen type electrode is adopted in manual metal-arc welding, and specification φ 3.2, and φ 4.0, and power supply adopts dc reverse connection.
3, weld preheating: before the welding foreign material such as the iron rust in the 200mm scope around the plug welding zone, greasy dirt, slag oxide are removed clean; Dress welding line backing plate mounts heating plate simultaneously and carries out weld preheating in the outside, furnace shell plug welding hole.
4, welding: the furnace body inside welding, at first by manual electric arc welding plug welding 1/3 degree of depth, again by CO
2Gas is protected the weldering plug welding; During welding, interlayer temperature is controlled at about 200～240 ℃, and it is clean that layer and the welding slag between the layer are removed, and every layer of processing step when welding is identical; Welding is taked to work continuously in shifts in 24 hours, and welding must not pause before accomplishing, and guarantees that whole welding line is in keeping warm mode all the time.
5, postwelding after-baking: should carry out after-baking immediately after weld seam has welded; Cover electric heating sheets at the plug weld position; The insulation of outsourcing asbestos, programming rate are by≤50 ℃/hour, and insulation is 2 hours in the time of 300 ℃; Slowly lower the temperature by≤50 ℃/hour speed then, reduce to and remove insulation and electric heater unit behind the normal temperature.
The local damage that renovation technique of the present invention produces to the steelmaking converter furnace shell (penetrability is destroyed in the size 200mm), its process is simple to operate, easy to implement; And production efficiency is high, reliable welding quality.
The specific embodiment
Be example with 300 tons of converter shell burning hole REPAIR WELDING below, explain that large converter shell perforation plug welding of the present invention connects renovation technique, concrete grammar is following:
1) welding method: adopt manual electric arc welding+CO
2Gas is protected the weldering plug welding, and the attenuate position is for adopting CO
2Gas is protected the weldering built-up welding.
2) welding sequence: the furnace body inside welding, at first by manual electric arc welding plug welding 1/3 degree of depth, again by CO
2Gas is protected the weldering plug welding.
3) welding material: the J507 ultralow hydrogen type electrode is adopted in manual metal-arc welding, and specification φ 3.2, and φ 4.0, and power supply adopts dc reverse connection.J507 ultralow hydrogen type electrode weldering is dried, and temperature 350-400 ℃, be incubated 2 hours, the welding rod that baking is got well is placed in 100 ℃ the heat-preservation cylinder, ready access upon use.The welding rod that makes moist is forbidden to use.
4) welding equipment: CO
2Gas shielded arc welding adopts FKR-500 welding machine, and ZX7-400 welding machine is adopted in manual electric arc welding.
5) welding condition
6) weld preheating
Before the welding foreign material such as the iron rust in the 200mm scope around the plug welding zone, greasy dirt, slag oxide are removed clean.The weld seam backing plate of dress weldering δ 8 * 30 mounts heating plate simultaneously and carries out weld preheating in the outside, furnace shell plug welding hole.In 180～200 ℃ of the preheat temperatures, weld seam both sides 50～300mm scope is heating region, mode of heating, the heating of crawler type electric heating sheets.
7) when welding, interlayer temperature is controlled at about 200～240 ℃, and layer must be removed totally with the welding slag between the layer, and every layer of processing step when welding is identical.Welding is taked to work continuously in shifts in 24 hours, and welding must not pause before accomplishing, and guarantees that whole welding line is in keeping warm mode all the time.
Speed of welding is according to fusion situation oneself control of weld seam and mother metal, and after welding finished, face of weld must not have defectives such as crackle, slag inclusion, pore.
8) postwelding after heat and stress relief annealing are handled
After having welded, weld seam should carry out after-baking immediately; Cover electric heating sheets at the plug weld position, the thick asbestos insulation of outsourcing 50 ㎜, programming rate is by≤50 ℃/hour, and insulation is 2 hours in the time of 300 ℃, slowly lowers the temperature by≤50 ℃/hour speed then, removes insulation and electric heater unit after reducing to normal temperature.(intensification and cooling rate are set according to thickness of slab).
The heat treatment if engineering time permission suggestion use postwelding eliminates stress.The heat treatment detailed process that eliminates stress is on the basis of after heat, slowly to be warming up to 600 ℃, is incubated 2 hours, slowly lowers the temperature by≤50 ℃/hour speed then.For the bigger plug welding point temperature retention time of welding stress extend to 4～5 hours in case detent plug solder joint and overlaying layer stripping with come off.
9) postwelding removing surface: postwelding is with all interim supporting removals of face of weld and peripheral region, and crator, spatter thing etc. are clean with the electric angle grinder polishing.
10) postwelding check: the existence of weld defects such as the process visual examination does not find that crackle is arranged, overlap, pore, slag inclusion; Using the MT+UT butt welded seam to carry out inside detects; Flaw detection is carried out by the JB/T4730-2005 requirement; The MT acceptance requirement is
, and level is qualified, and the UT acceptance requirement be
grade qualified.
Claims (3)
1. a large converter shell perforation plug welding connects renovation technique, and method is following:
1), welding manner: adopt manual electric arc welding+CO
2Gas is protected the weldering plug welding, and the attenuate position is for adopting CO
2Gas is protected the weldering built-up welding;
2), welding material: ultralow hydrogen type electrode is adopted in manual metal-arc welding, diameter phi 3.2-φ 4.0, power supply employing dc reverse connection;
3), weld preheating: before the welding foreign material such as the iron rust in the 200mm scope around the plug welding zone, greasy dirt, slag oxide are removed clean; Dress welding line backing plate mounts heating plate simultaneously and carries out weld preheating in the outside, furnace shell plug welding hole;
4), welding: furnace body inside welds, at first by manual electric arc welding plug welding 1/3 degree of depth, again by CO
2Gas is protected the weldering plug welding; During welding, interlayer temperature is controlled at about 200～240 ℃, and it is clean that layer and the welding slag between the layer are removed, and every layer of processing step when welding is identical; Welding is taked to work continuously in shifts in 24 hours, and welding must not pause before accomplishing, and guarantees that whole welding line is in keeping warm mode all the time;
5), postwelding after heat and stress relief annealing: should carry out after-baking immediately after weld seam has welded; Cover electric heating sheets at the plug weld position; The insulation of outsourcing asbestos, programming rate are by≤50 ℃/hour, and insulation is 2 hours in the time of 300 ℃; Slowly lower the temperature by≤50 ℃/hour speed then, reduce to and remove insulation and electric heater unit behind the normal temperature.
2. large converter shell perforation plug welding according to claim 1 connects renovation technique, it is characterized in that: CO
2Gas shielded arc welding adopts FKR-500 welding machine, and ZX7-400 welding machine is adopted in manual electric arc welding.
3. large converter shell perforation plug welding according to claim 1 connects renovation technique; 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, slowly to be warming up to 600 ℃; Temperature retention time 2 hours is slowly lowered the temperature by≤50 ℃/hour speed then; For the bigger plug welding point of welding stress, temperature retention time extend to 4～5 hours in case detent plug solder joint and overlaying layer stripping with 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)
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| CN102717171A true CN102717171A (en) | 2012-10-10 |
| CN102717171B 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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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103028813A (en) * | 2012-12-19 | 2013-04-10 | 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 |
| CN103464925A (en) * | 2013-09-22 | 2013-12-25 | 国家电网公司 | High-temperature heat-proof steel component welding repair method for power station |
| CN103481008A (en) * | 2013-09-05 | 2014-01-01 | 通裕重工股份有限公司 | Deep-hole repair welding technology |
| 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 |
| CN106670619A (en) * | 2016-12-20 | 2017-05-17 | 柳州振业焊接机电设备制造有限公司 | Car top plate welding method |
| CN107598334A (en) * | 2017-10-25 | 2018-01-19 | 安徽马钢设备检修有限公司 | Double online welding and restoring process of material axial workpiece |
| CN108994419A (en) * | 2018-08-20 | 2018-12-14 | 江苏科技大学 | A kind of pecker composite overlaying manufacturing method |
| CN109249180A (en) * | 2018-09-21 | 2019-01-22 | 大连德宇机械有限公司 | Mixer screw rod renovation technique |
| 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 |
| CN110653450A (en) * | 2019-08-01 | 2020-01-07 | 广东韶钢松山股份有限公司 | Online repairing method for converter body perforation |
| CN112935480A (en) * | 2021-03-25 | 2021-06-11 | 安徽马钢设备检修有限公司 | Repairing device and repairing process for surface abrasion of large wheel fixing table base |
| CN113369732A (en) * | 2021-05-27 | 2021-09-10 | 河钢股份有限公司承德分公司 | Heat treatment welding method for converter shell |
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| JPH07241668A (en) * | 1994-03-04 | 1995-09-19 | Nippon Steel Corp | How to weld stainless steel plug with flux-cored wire |
| JPH11314154A (en) * | 1998-04-30 | 1999-11-16 | Honda Motor Co Ltd | Plug welding method of aluminum work |
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Non-Patent Citations (1)
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| 刘宏敏: "孔塞焊工艺探讨", 《机械工程师》 * |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103028813A (en) * | 2012-12-19 | 2013-04-10 | 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 |
| CN103481008A (en) * | 2013-09-05 | 2014-01-01 | 通裕重工股份有限公司 | Deep-hole repair welding technology |
| CN103481008B (en) * | 2013-09-05 | 2017-01-25 | 通裕重工股份有限公司 | Deep-hole repair welding technology |
| CN103464925A (en) * | 2013-09-22 | 2013-12-25 | 国家电网公司 | High-temperature heat-proof steel component welding repair method for power station |
| 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 |
| CN106670619B (en) * | 2016-12-20 | 2019-02-05 | 柳州振业焊接机电设备制造有限公司 | Roof panel welding method |
| CN106670619A (en) * | 2016-12-20 | 2017-05-17 | 柳州振业焊接机电设备制造有限公司 | Car top plate welding method |
| 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 |
| CN107598334A (en) * | 2017-10-25 | 2018-01-19 | 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 |
| CN108994419A (en) * | 2018-08-20 | 2018-12-14 | 江苏科技大学 | A kind of pecker composite overlaying manufacturing method |
| CN109249180A (en) * | 2018-09-21 | 2019-01-22 | 大连德宇机械有限公司 | Mixer screw rod renovation technique |
| CN110653450A (en) * | 2019-08-01 | 2020-01-07 | 广东韶钢松山股份有限公司 | Online repairing method for converter body perforation |
| 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 |
| CN112935480A (en) * | 2021-03-25 | 2021-06-11 | 安徽马钢设备检修有限公司 | Repairing device and repairing process for surface abrasion of large wheel fixing table base |
| 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 |
| CN113369732A (en) * | 2021-05-27 | 2021-09-10 | 河钢股份有限公司承德分公司 | Heat treatment welding method for converter shell |
| 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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| CN102717171B (en) | 2014-12-10 |
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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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