Method of eliminating welding residual stress by low temperature compression deformation treatment

Abstract

A method for eliminating the residual welding stress in the low-temp. compressive strain includes such steps as quickly heating the welded position within a limited region (width of 50-200 mm) to 200-400 deg.C for generating compressive plastic strain under the action of cold neighbouring region, resulting in the original compressive stress in the heated region also to produce the plastic compressive strain and after cooling, the residual stress in the welded joint produces radistribution. Its advantages are high effect and easy operation.

Description

technical field [0001] The invention relates to the technology of eliminating welding residual stress, and in particular provides a method for eliminating welding residual stress through low-temperature compression deformation treatment. Background technique [0002] For many years, post-weld annealing heat treatment, which belongs to the category of creep deformation method, has been a popular method in the engineering field, but it has the following disadvantages: because it achieves the purpose of eliminating residual stress by means of the mechanism of material creep at high temperature, so It is usually carried out at a temperature above 600°, which will inevitably consume more energy and the construction period will be longer. For structural parts made of quenched and tempered steel, stainless steel, composite plates and other materials, there are technical difficulties in annealing stress relief treatment. When the size of the component is large enough, the effect of...

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Problems solved by technology

[0002] For many years, post-weld annealing heat treatment, which belongs to the category of creep deformation method, has been a popular method in the engineering field, but it has the following disadvantages: because it achieves the purpose of eliminating residual stress by means of the mechanism of material creep at high temperature, so It is usually carried out at a temperature above 600°, which will inevitably consume more energy and the construction period will be longer

However, although this method has been proposed for half a century, it has not been widely used in industry.

There may be two reasons: one is that the process needs to be continuously and reasonably implemented on the actual structure (such as a container), and special equipment is required; the other is that it is difficult to guarantee the effect of stress relief for structures with a thickness of more than 20mm, especially the transverse residual stress

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