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Corrosion crack welding restoration method and material for regenerator

A technology of welding repair and stress corrosion cracking, which is applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., can solve problems such as stress corrosion of regenerators, and achieve the effect of prolonging service life and avoiding cracking

Inactive Publication Date: 2014-02-05
CHANGZHOU UNIV
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Problems solved by technology

[0004] In view of the above problems, the object of the present invention is to provide a regenerator we

Method used

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  • Corrosion crack welding restoration method and material for regenerator
  • Corrosion crack welding restoration method and material for regenerator

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[0017] Welding repair methods are divided into pre-welding preparation procedures, welding repair procedures and post-welding inspection procedures, as follows.

[0018] 1 Preparation process before welding

[0019] (1) Eliminate defects: Use carbon arc gouging (or grinder) to polish and clean the defective parts until all the defects are eliminated.

[0020] (2) Grinding the groove: the angle between the slopes on both sides of the groove is 50°~60°, the groove length direction is consistent with the crack direction, and the groove length is ≥100mm. When the crack penetrates the wall thickness, the gap between the two sides of the groove on the inner surface is not more than 2±1mm.

[0021] (3) Defect detection: According to the requirements of JB / T4730, special flaw detectors will perform surface flaw detection (magnetic powder or coloring) to confirm that all surface flaws in the groove area are removed. If they are not removed, they should be removed again until they are qualified...

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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 [0001] The invention belongs to the technical field of welding and repairing of pressure vessels, and relates to a welding repair method and material for a carbon steel (or low alloy steel) regenerator after stress corrosion cracking. Background technique [0002] The regenerator is used in the catalytic cracking unit of the petrochemical enterprise's refinery. Its medium is highly corrosive, which can easily lead to stress corrosion cracking, especially in the weld, which seriously affects production and safety. [0003] For the welding repair of pressure vessels, the same welding material as the base metal has been used for welding repair, but the regenerator made of carbon steel (or low alloy steel) has no effect when using the same welding material as the base metal for welding repair. Unsatisfactory: Some new cracks are continuously generated at both ends of the repaired part during the repair process or within a few hours after the repair, so that after...

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Application Information

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IPC IPC(8): B23K35/24B23P6/00
CPCB23P6/04B23K35/308
Inventor 魏安安范玲玲
Owner CHANGZHOU UNIV
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