Method for testing residual stress of steel thin welding plate with narrow welding seam characteristic

Abstract

The invention discloses a method for testing residual stress of a steel thin welding plate with a narrow welding seam characteristic. The method is characterized by comprising the steps of measuring distribution characteristics of residual stress of a steel plate after welding by adopting a coercive force method; measuring the size and the direction of the residual stress at the grinding and polishing depth of the narrow welding seam by adopting an X-ray diffraction method; and obtaining the magnitude and direction of the residual stress of the actual grinding and polishing depth layer through an electrolytic polishing layer-by-layer stripping technology. The method is simple in detection process and high in detection efficiency, the distribution, the size and the direction of the residual stress after welding and grinding and polishing can be obtained after detection, and on-site rapid and accurate detection of the residual stress is achieved.

Description

technical field [0001] The invention relates to a method for testing the residual stress of welding materials, in particular to a method for testing the residual stress of thin steel welded plates with narrow weld seam characteristics. Background technique [0002] Steel thin plates are prone to uneven internal stress during welding and use, which leads to deterioration or deterioration of the plate shape. The wall panels and decks of luxury cruise ships are mainly made of 4-6 mm high-strength steel thin plate structures. The aesthetics and comfort of cruise ships require that the high-strength steel sheets used should have extremely high forming accuracy and quality. The amount of welding of thin plates such as wall panels and decks of luxury cruise ships is large, and the welding deformation of thin plate structures and the precision of segmented construction are extremely high. Larger welding deformation seriously affects the beauty of the hull and sailing comfort, and re...

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Problems solved by technology

[0008] As mentioned above, the coercive force method alone cannot measure the direction of residual stress after laser welding and cannot achieve accurate positioning and measurement of the residual stress of a narrow weld with a certain height. Accurate measurement of residual stress after welding of rough and narrow welds. Aiming at the shortcomings of the above-mentioned existing residual stress

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