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Method for determining residual butt welding stress of aluminum alloy sheets

A technique of residual stress, determination method, applied in the direction of measuring force, measuring device, instrument, etc.

Inactive Publication Date: 2013-01-09
CHINA ZHONGWANG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is mostly suitable for the determination of surface residual stress at a certain position of the welded joint, and there are many technical difficulties in the pasting of strain gauges, calibration curves, finite element analysis, etc.

Method used

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  • Method for determining residual butt welding stress of aluminum alloy sheets
  • Method for determining residual butt welding stress of aluminum alloy sheets

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Embodiment Construction

[0016] The present invention will be described in detail below through a specific embodiment. It should be understood that the preferred embodiments are only for illustrating the present invention, but not for limiting the protection scope of the present invention.

[0017] The steps of the present invention are as follows:

[0018] 1) Before welding the aluminum plate, use a marking tool to mark at least 2 marking lines with a line mark width not greater than 0.05mm in the welding heat-affected zone of the aluminum plate along the direction parallel to the weld, and set the middle distance on the same side of the weld The same two marking lines are a group, use the measuring tool to measure the distance between the two marking lines in each group;

[0019] 2) After the aluminum plate is welded, measure the distance between the two marking lines in each group again;

[0020] 3) Cut at least one cut strip along the vertical direction of the marked line, measure the distance b...

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Abstract

The invention discloses a method for determining residual butt welding stress of aluminum alloy sheets. On a condition of a plane stress field formed at butt welding joints of sheets, the sheets are slitted by a linear cutting method along weld seams longitudinally or transversely, so that welding stress can be released. Precise marked lines are engraved on a measuring surface of a weld part before welding, distances of the marked lines are measured by a microscope before welding, after welding and after slitting respectively, a corresponding strain increment can be solved according to increment of the distances of the marked lines, and finally residual stress is solved according to the strain increment. The method is visual, simple and convenient and applicable to determining residual butt welding stress of aluminum alloy sheets on testing conditions; and measured results are good in repeatability, reproducibility and comparability.

Description

technical field [0001] The invention relates to a method for measuring welding residual stress of metal materials, in particular to a method for measuring residual stress of aluminum alloy sheet butt welding. Background technique [0002] Among the prior art, the closest prior art to the present invention is GB / T24179-2009 Indentation Strain Method for Determination of Residual Stress of Metal Materials. The indentation strain method uses indentation testing machines, strain gauges, strain gauges and other instruments to measure the strain, and then uses Hooke's law to calculate the welding residual stress. This method is mostly suitable for the determination of surface residual stress at a certain position of a welded joint, and there are many technical difficulties in the pasting of strain gauges, calibration curves, and finite element analysis. However, the present invention observes the variation of the distance between the scribe lines of the sample before and after we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/00G01N19/00
Inventor 王周兵秦利陆宏韬宋磊
Owner CHINA ZHONGWANG
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