Welding repair method for local damage of G42CrMo4N cold rolling shaft sleeve

Abstract

The invention discloses a welding repair method for local damage of a G42CrMo4N cold rolling shaft sleeve and belongs to electric welding and particularly relates to non-joint welding for steel alloy. The welding repair method comprises the following steps of: 1, cleaning the surface of the shaft sleeve; 2, processing a welding face; 3, manufacturing a build-up welding liner; 4, installing the build-up welding liner; 5, welding; 6, relieving stress annealing after welding; 7, performing postwelding checkout; and 8, performing original size recovery finish machining. Compared with the prior art, the welding repair method has the advantages that the conception is novel, and implementation is easy. By adopting a reasonable welding process, selecting a suitable welding material and installing the tubular liner in the shaft sleeve, deformation caused by build-up welding of the shaft sleeve is overcome, and the repair accuracy is ensured. The method is simple in operation and can be easily implemented; the old is repaired and the waste is utilized; the service life of the shaft sleeve is prolonged; the consumption of spare parts is reduced; the cost of the spare parts is saved; and the production cost is reduced. The welding repair method is in favor of the smooth progress of steel rolling production. The welding repair method can be widely suitable for welding repair of the local damage of equipment and the spare parts made of a G42CrMo4N material.

Description

technical field [0001] This invention pertains to electric welding, and more particularly to welding for non-joining purposes of steel alloys. technical background [0002] The cold-rolled bushes used by this unit are imported parts, and the material is G42CrMo4N. During the rolling production process, blocky cracks often occur, which affects the safety of equipment use. In order to maintain the normal rolling production, the current method is to replace the shaft sleeve. The disadvantage is that the consumption of spare parts is large, the amount of spare parts is large, and it takes up a lot of money; the second is to repair, but due to the material, there is no mature method to follow. In the end, it had to be scrapped. In this way, the cold rolling mill must invest a large amount of money to prepare enough shaft sleeve spare parts, otherwise it will seriously affect the smooth progress of production. Contents of the invention [0003] In order to overcome the defects...

AI Technical Summary

Problems solved by technology

[0002] The cold-rolled bushings used by this unit are imported parts, and the material is G42CrMo4N. During the rolling production process, block cracks often occur, which affects the safety of equipment use.

In order to maintain the normal rolling production, the current method is to replace the shaft sleeve. The disadvantage is that the consumption of spare parts is large, the amount of spare parts is large, and it takes up a lot of money; the second is to repair, but due to the material, there is no mature method to follow. eventually had to be scrapped

In this way, the cold rolling mill must invest a lot of money and prepare enough shaft sleeve spare parts, otherwise it will seriously affect the smooth production

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