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

A technology of residual stress and compression deformation, applied in the direction of metal processing, etc., can solve the problems such as difficult to guarantee the effect of stress relief, long construction period, multi-energy, etc., and achieve the effect of eliminating welding residual stress, low cost, and small energy

Inactive Publication Date: 2003-12-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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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 wil

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

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[0016] The invention is aimed at welding structural parts of various thicknesses and made of various materials, using general heating technology to create a certain temperature difference in the limited width area (50-200mm) of the welded joint, so that the residual compressive stress area of ​​the welded joint Compressive plastic deformation is produced, so as to achieve the purpose of reducing welding residual stress. Specifically, the welding zone is quickly heated to a certain temperature (200-400°C, depending on the yield strength of the material) to cause it to expand. The thermal expansion generated in the heating zone of the welded joint is restricted by the metal in the adjacent colder area. Compression plastic deformation ε C (see figure 1 ), this deformation is superimposed with the original welding residual stress (given by the residual strain εR in the figure). As a result, the original compressive stress in the heating zone produces a plastic compression deformation...

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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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Application Information

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IPC IPC(8): B23P25/00
Inventor 陈怀宁林泉洪黄春玲陈亮山吕建民陈静
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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