Welding repairing method for rolls

Abstract

The invention relates to a welding repairing method for rolls. The welding repairing method is characterized by comprising the following steps of (1) performing flaw detection on depths and lengths of fractures of cracked and damaged portions, and performing polishing and back chipping on the cracked and damaged portions of surfaces of rolls; (2) performing pre-heating treatment on the rolls; (3) performing repairing welding by using a surfacing process; (4) performing heat treatment after welding; (5) machining according to the requirement of a drawing; and (6) performing nondestructive testing and hardness measurement. According to the welding repairing method, the damaged rolls are repaired by a series of industrial means and processes. According to tracking statistics, the service lives of the repaired rolls are the same with those of new rolls, the surface hardness of the repaired rolls reaches HRC 56-60, so that the cost of a use unit on the rolls can be greatly reduced, and the purpose of reducing cost and increasing efficiency is achieved.

Description

technical field [0001] The invention relates to a roll welding repair method. Background technique [0002] During the use of cold-bending or welded pipe rolls, due to large changes in local strength, the rolls will be damaged, such as wear, collapse, cracks on the roll surface, roll breakage, and uneven hardness of the rolls, which will cause the rolls to be scrapped. Because the cold-bending or welded pipe rolls are made of GCr15 material, the price is relatively high, and no repair method has been found to make the damaged rolls achieve their original performance. Therefore, how to repair the rolls and prolong the service life of the rolls has become the key to reducing production costs. Contents of the invention [0003] Aiming at the problems existing in the prior art, the object of the present invention is to provide a technical proposal of a roll welding repair method. [0004] The described method for welding and repairing a roll is characterized in that the roll ...

AI Technical Summary

Problems solved by technology

[0002] During the use of cold-bending or welded pipe rolls, due to large changes in local strength, the rolls will be damaged, such as wear, collapse, cracks on the surface of the roll, breakage of the roll, uneven hardness of the roll, etc., resulting in the scrapping of the roll

Because cold-bending or welded pipe rolls are made of GCr15 material, the price is relatively high, and there is no repair method that can make the damaged roll achieve the original performance. Therefore, how to repair the roll and prolong the service life of the roll has become the key to reducing production costs.