Sample for welding crack sensitivity test and welding crack sensitivity test method

Abstract

The invention discloses a sample for a welding crack sensitivity test. The sample comprises a rectangular sample body, the sample body is provided with long edges and wide edges and is provided with aplurality of first slots extending from the long edges to the middle portion of the sample, the first slots are vertically arranged relative to the long edges, separation distances between the multiple first slots in pairs are equal, a center line in the width direction of the sample is further provided with a welding groove extending in the length direction of the sample, and the cross-sectionalshape of the welding groove is a'y'type. The invention further discloses a welding crack sensitivity test method which performs the welding crack sensitivity test adopting the sample for the weldingcrack sensitivity test. According to the welding crack sensitivity test method, because the sample with the cross-sectional shape of the welding groove being the'y'type, a welding seam root portion notch points to a heat-affected area, cracks craze and extend to the heat-affected area preferentially, and quantitative testing and evaluating can be performed on the cold cracking sensitivity of the welding heat-affected area of a plate material.

Description

technical field [0001] The invention relates to a sample and a test method, in particular to a sample for a welding crack sensitivity test and a welding crack sensitivity test method. Background technique [0002] Commonly used metal material welding cold crack sensitivity evaluation methods include bolt test, inclined Y-groove welding crack test, Caspian sea test, etc. The plug test is an external restraint test, which is suitable for quantitatively assessing the crack tendency of materials, and can carry out relevant theoretical research in depth. However, due to the need for special equipment, it generally needs to be completed in a laboratory. Both the oblique Y-groove welding crack test and the Caspian Sea test are self-restrained crack resistance tests. Their advantages are that the test is convenient, does not require special equipment, and can be completed at the construction site. Specifically, the oblique Y-groove welding crack test is mainly used to evaluate the ...

AI Technical Summary

Problems solved by technology

Specifically, the oblique Y-groove welding crack test is mainly used to evaluate the cold crack sensitivity of low-alloy structural steel welds and heat-affected zones. It uses welding restraint welds to determine the oblique Y-groove clearance of test welds. However, due to the influence of welding deformation, it is difficult to guarantee the accuracy and consistency of the gap distance of the inclined Y-groove, so it is prone to failure samples and poor reproducibility of test results. Therefore, the welding crack test of inclined Y-groove is generally It is only used as a qualitative detection method for welding cold cracks, and it is difficult to use it for quantitative evaluation and comparison

The Caspian sea test is to complete the processing of the welding groove by machining at the center of the whole plate, which can ensure the accuracy of the groove gap distance and the consistency of the welding groove and groove gap of each sample. However, the Caspian sea test It is generally used to evaluate the crack sensitivity of the weld metal of the material, and cannot evaluate the cold crack sensitivity of the plate welding heat-affected zone

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