CN103551755A - Corrosion crack welding restoration method and material for regenerator - Google Patents
Corrosion crack welding restoration method and material for regenerator Download PDFInfo
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- CN103551755A CN103551755A CN201310529699.6A CN201310529699A CN103551755A CN 103551755 A CN103551755 A CN 103551755A CN 201310529699 A CN201310529699 A CN 201310529699A CN 103551755 A CN103551755 A CN 103551755A
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- welding
- regenerator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
- B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
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- Arc Welding In General (AREA)
Abstract
The invention discloses a corrosion crack welding restoration method and a corrosion crack welding restoration material for a regenerator. Welding materials in the same type as parent materials are adopted for the welding restoration of a pressure container in the prior art, but when the method is used for restoring the regenerator, new cracks are often generated. The invention relates to a stainless steel welding strip, which mainly comprises the following ingredients: 0.15 percent of C, 0.5 to 2.5 percent of Mn, 0.9 percent of Si, 22.0 to 25.0 percent of Cr, 12.0 to 14.0 percent of Ni and 0.75 percent of Mo. The invention also relates to a restoration method, which comprises the steps of crack elimination, nondestructive examination, welding groove trimming and grinding, groove surface flaw detection, welding repairing by the stainless steel welding strip, grinding, cleaning and surface flaw detection on the welding repairing positions, and ultrasonic wave or ray flaw detection. When the method and the material provided by the invention are adopted, the crack in the welding restoration process can be avoided, and the service life after the restoration can also be obviously prolonged.
Description
Technical field
The invention belongs to pressure vessel Welding Repair Technology field, relate to welding repair method and material after a kind of carbon steel (or low-alloy steel) regenerator stress corrosion cracking.
Background technology
Regenerator is for the catalytic cracking unit of petroleum chemical enterprise's oil plant, and its medium has severe corrosive, is easy to cause stress corrosion cracking, especially at weld seam position, has had a strong impact on production and safety.
REPAIR WELDING problem for pressure vessel, adopt the welding material identical with mother metal to carry out REPAIR WELDING always, and the regenerator of being made by carbon steel (or low-alloy steel) while selecting the welding material identical with mother metal to carry out REPAIR WELDING effect unsatisfactory: have in repair process or after repairing in a few hours, at the two ends of repairing position, constantly there is new crackle to produce, the crackle that causes tens millimeters long is after excavation filling mend repeatedly, and last continuous repair length reaches several meters long unexpectedly; After some reparations, use tens days or some months ftractures again.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of regenerator welding repair method and material, solve the reparation problem after regenerator stress corrosion cracking.
Welding material provided by the invention is a kind of stainless steel electrode, and its composition is: C:0.15%, Mn:0.5～2.5%, Si:0.9%, Cr:22.0～25.0%, Ni:12.0～14.0%, Mo:0.75%, S:0.03%, P:0.04%.
Welding repair method provided by the invention, comprises following concrete steps:
(1) with carbon arc air gouging (or abrasive machine), carry out crackle elimination.
(2) with the position that ultrasonic wave (or ray), magnetic (or infiltration) method of detection are eliminated crackle, detect, confirm that inside and blemish elimination are clean.
(3) reconditioning bevel for welding.
(4) groove face is carried out to surface inspection (magnetic or infiltration), until qualified (being surperficial zero defect).
(5) with stainless steel electrode, carry out repair welding, until weldering is full.
(6) repair welding position is polished, cleared up, elimination is splashed.
(7) surface inspection is carried out in repair welding position, guarantee free of surface defects (crackle, pore, slag inclusion, undercut).
(8) to repair welding position and near carry out ultrasonic wave or radiographic inspection, guarantee without surface or inner defect (crackle, pore, slag inclusion).
The technique effect that the present invention produces is: adopt method provided by the invention and material, can avoid the cracking in REPAIR WELDING process, also can obviously extend the service life after reparation.
Accompanying drawing explanation
Figure is bevel for welding schematic diagram.
The specific embodiment
Welding repair method is divided into the front preparatory process of weldering, REPAIR WELDING operation and postwelding inspection process, specific as follows.
Preparatory process before 1 weldering
(1) eliminate defect: with carbon arc air gouging (or abrasive machine), the polishing of defective position is cleaned out, until defect is all eliminated.
(2) reconditioning groove: inclined-plane, the both sides angle of groove is 50 °～60 °, and groove length direction is consistent with direction of check, groove length >=100mm.During crack penetration wall thickness, two sides of groove are not more than 2 ± 1mm in the gap at inner surface place.
(3) defects detection: according to the requirement of JB/T4730, carry out surface inspection (magnetic or painted) by flaw detection personnel specially, confirm that groove district blemish all removes, if do not eliminate, should again remove, until qualified.
2 welding and restoring process
Adopt manual electric arc welding to carry out repair welding.Adopt above-mentioned stainless steel electrode, welding procedure is as following table:
3 postwelding inspection process
(1) repair welding position is polished, cleared up, elimination is splashed.
(2) surface inspection is carried out in repair welding position, guarantee free of surface defects (crackle, pore, slag inclusion, undercut).
(3) to repair welding position and near carry out ultrasonic wave or radiographic inspection, guarantee without surface or inner defect (crackle, pore,
Slag inclusion).
Claims (5)
1. for the welding repair method after regenerator stress corrosion cracking and a material, it is characterized in that material therefor is a kind of stainless steel electrode, restorative procedure used carries out according to the following steps:
(1) with carbon arc air gouging (or abrasive machine), carry out crackle elimination.
(2) with the position that ultrasonic wave (or ray), magnetic (or infiltration) method of detection are eliminated crackle, detect, confirm that inside and blemish elimination are clean.
(3) reconditioning bevel for welding.
(4) groove face is carried out to surface inspection (magnetic or infiltration), until qualified (being surperficial zero defect).
(5) with stainless steel electrode, carry out repair welding, until weldering is full.
(6) repair welding position is polished, cleared up, elimination is splashed.
(7) surface inspection is carried out in repair welding position, guarantee free of surface defects (crackle, pore, slag inclusion, undercut).
(8) to repair welding position and near carry out ultrasonic wave or radiographic inspection, guarantee without surface or inner defect (crackle, pore, slag inclusion).
2. regenerator according to claim 1, is characterized in that: regenerator is for the catalytic cracking unit of petroleum chemical enterprise's oil plant, and it also comprises the carbon steel equipments such as three revolving of being connected with regenerator, settler.
3. bevel for welding according to claim 1, it is characterized in that: inclined-plane, the both sides angle of groove is 50 °～60 °, and groove length direction is consistent with crack length direction, groove length >=100mm, during crack penetration wall thickness, two sides of groove are 2 ± 1mm in the gap at inner surface place.
4. welding material according to claim 1 (stainless steel electrode), is characterized in that: the chemical composition of welding rod material is: C:0.15%, Mn:0.5～2.5%, Si:0.9%, Cr:22.0～25.0%, Ni:12.0～14.0%, Mo:0.75%, S:0.03%, P:0.04%.
5. welding repair method according to claim 1, is characterized in that: this kind of welding repair method is without carrying out post weld heat treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310529699.6A CN103551755A (en) | 2013-10-31 | 2013-10-31 | Corrosion crack welding restoration method and material for regenerator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310529699.6A CN103551755A (en) | 2013-10-31 | 2013-10-31 | Corrosion crack welding restoration method and material for regenerator |
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| CN103551755A true CN103551755A (en) | 2014-02-05 |
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| CN201310529699.6A Pending CN103551755A (en) | 2013-10-31 | 2013-10-31 | Corrosion crack welding restoration method and material for regenerator |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977354A (en) * | 2015-06-30 | 2015-10-14 | 共享铸钢有限公司 | Cast steel member repair-welding and repairing high-temperature detection method |
| CN105738468A (en) * | 2014-12-10 | 2016-07-06 | 西安航空动力控制科技有限公司 | Nondestructive test method of gear component subjected to laser repair welding |
| CN108555525A (en) * | 2018-04-17 | 2018-09-21 | 南京金创有色金属科技发展有限公司 | A kind of welding and restoring process for absorption desulfurization regeneration device |
| CN111168207A (en) * | 2020-01-14 | 2020-05-19 | 台州市特种设备检验检测研究院 | Repair welding seam method for stress corrosion cracks of ammonia refrigeration container |
| CN112453824A (en) * | 2020-11-18 | 2021-03-09 | 杨媛媛 | Titanium alloy compressor blade welding repair method |
| CN113373293A (en) * | 2021-06-11 | 2021-09-10 | 青岛海越机电科技有限公司 | Repairing and welding heat treatment method for corrosion area of inner wall of hydrogenation reactor of large-scale chemical equipment |
| CN114346586A (en) * | 2021-12-10 | 2022-04-15 | 南京钢铁股份有限公司 | Argon arc welding repair method for defects of stainless steel composite plate |
| CN114799722A (en) * | 2022-04-14 | 2022-07-29 | 江苏海川石化工程技术有限公司 | Rapid repair method for local stress corrosion defect of pressure vessel |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738468A (en) * | 2014-12-10 | 2016-07-06 | 西安航空动力控制科技有限公司 | Nondestructive test method of gear component subjected to laser repair welding |
| CN104977354A (en) * | 2015-06-30 | 2015-10-14 | 共享铸钢有限公司 | Cast steel member repair-welding and repairing high-temperature detection method |
| CN108555525A (en) * | 2018-04-17 | 2018-09-21 | 南京金创有色金属科技发展有限公司 | A kind of welding and restoring process for absorption desulfurization regeneration device |
| CN108555525B (en) * | 2018-04-17 | 2020-07-28 | 南京金创有色金属科技发展有限公司 | Welding repair process for adsorption desulfurization regenerator |
| CN111168207A (en) * | 2020-01-14 | 2020-05-19 | 台州市特种设备检验检测研究院 | Repair welding seam method for stress corrosion cracks of ammonia refrigeration container |
| CN111168207B (en) * | 2020-01-14 | 2021-11-16 | 台州市特种设备检验检测研究院 | Repair welding seam method for stress corrosion cracks of ammonia refrigeration container |
| CN112453824A (en) * | 2020-11-18 | 2021-03-09 | 杨媛媛 | Titanium alloy compressor blade welding repair method |
| CN113373293A (en) * | 2021-06-11 | 2021-09-10 | 青岛海越机电科技有限公司 | Repairing and welding heat treatment method for corrosion area of inner wall of hydrogenation reactor of large-scale chemical equipment |
| CN114346586A (en) * | 2021-12-10 | 2022-04-15 | 南京钢铁股份有限公司 | Argon arc welding repair method for defects of stainless steel composite plate |
| CN114799722A (en) * | 2022-04-14 | 2022-07-29 | 江苏海川石化工程技术有限公司 | Rapid repair method for local stress corrosion defect of pressure vessel |
| CN114799722B (en) * | 2022-04-14 | 2023-07-21 | 江苏海川石化工程技术有限公司 | Quick repairing method for local stress corrosion defect of pressure vessel |
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Application publication date: 20140205 |