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Method for measuring welding residual stress

A technology of residual stress and measurement method, which is applied in the field of engineering, can solve the problems of inability to measure at multiple points, high cost, and inability to measure the residual stress of drastic changes in welded components, and achieve the effects of convenient operation, reduction of additional stress, and assurance of integrity

Inactive Publication Date: 2009-09-23
XI AN JIAOTONG UNIV
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Problems solved by technology

The existing residual stress measurement method has the problems of high cost, inability to measure the drastic change of residual stress inside the welded component, and the inability to measure at multiple points. An internal residual stress measurement suitable for engineering applications that can measure multiple points and large gradient changes is needed method

Method used

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  • Method for measuring welding residual stress
  • Method for measuring welding residual stress
  • Method for measuring welding residual stress

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] see image 3 , The residual stress of multi-pass welding of low carbon steel plate with a thickness of 18mm was measured. Before the welding test, the material undergoes stress-relief heat treatment, first adopts manual TIG spot fixing and bottom welding, and then uses robot CO 2 Gas shielded welding is used for remaining weld bead welding, and the size of the weldment is: 100mm×300mm×18mm. Sequence of welding beads image 3 .

[0031] According to the measurement steps of the local layer-by-layer removal of blind holes, the internal residual stress measurement is carried out. The measurement process is as follows:

[0032] 1) First, the blind hole method is used to measure the welding residual stress on the upper and lower surfaces of the component;

[0033] 2) Place one end of the component 1 tightly on the horizontal workbench 2, and use the di...

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Abstract

The invention relates to a method for measuring welding residual stress-a partial layer-by-layer blind hole removing method for measuring the residual stress on the basis of a blind hole method, which proposes to measure the residual stress in a component by using the partial layer-by-layer blind hole removing method. After materials of certain depth on both the front side and the opposite side of a component to be measured are partially removed, the blind hole method is used for measuring the residual stress. The method is a semi-destructive residual stress measuring method, can be used for carrying out multi-point measurement and measuring the residual stress in the component with severe stress change and has convenient operation and high measuring efficiency. Proved by a thick plate carbon steel welding residual stress measuring test, the method has more accurate measuring results.

Description

technical field [0001] The invention belongs to a method for testing residual stress in the engineering field, and in particular relates to a method for measuring welding residual stress. Background technique [0002] Residual stress refers to the stress that still exists inside the material and maintains its own balance after the removal of various external factors that generate stress. These external factors are many, such as phase change, precipitation, temperature change, surface treatment, material processing, shot peening and so on. Residual stress is slightly different from internal stress. Internal stress refers to the stress that exists in the material or component and maintains its own balance after the removal of various external factors that generate stress or under constraint conditions. For example, structural components such as riveted parts and bridge trusses have been constrained for a long time, and the results of these constraints have caused the internal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/00
Inventor 张建勋牛靖刘川巩水利吴冰杨佳
Owner XI AN JIAOTONG UNIV
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