Method for making longitudinal cracks in simulated test block welding seams

Abstract

The invention discloses a method for making longitudinal cracks in simulated test block welding seams. The method comprises the following steps: prefabricating and welding, machining, cracking by adopting a mechanical method, trimming by adopting a mechanical processing method, teaming and selecting a teaming part welding method. Compared with an existing method for making longitudinal cracks in a simulated test block, the method disclosed by the invention has the advantages that additives are not added, and a metal material of the welding seams is adopted. The operation method is simple and practical, easy to grasp, and wide in scope of application. The made cracks are high in success rate and low in cost. The made cracks have topographic characteristics which are almost the same as those of true cracks, and are even consistent with those of true cracks, so that the characteristics of the true cracks can be reflected. The dimensions, namely height, length and generated positions, of the cracks are easy to control, the precision is high and the dimensions of the generated cracks easily meet requirements within an error range. The method disclosed by the invention is suitable for being applied as a simulated test block crack processing method for non-destructive testing of test pieces.

Description

technical field [0001] The invention relates to a simulated test block in the non-destructive testing technology, in particular to a method for making longitudinal cracks in the weld seam of the simulated test block. Background technique [0002] Pressure equipment is closely related to national economic production and people's daily life. However, pressure-bearing equipment often has the characteristics of high temperature, high pressure and toxic media. Once an accident occurs, the consequences will be extremely serious. In order to avoid possible quality accidents, a large number of non-destructive testing technologies are used in the manufacturing, use, and inspection of pressure equipment. According to statistics, in 2005 there were 274 serious accidents of pressure equipment, of which 48 were caused by the quality of the equipment itself, accounting for 20% of the number of accidents, and 38 were caused by equipment defects that were not found in time, accounting for ...

AI Technical Summary

Problems solved by technology

These three methods have disadvantages, namely: the first method is prone to other defects during welding, welding is difficult, requires a large welding space, and is limited by the thickness of the workpiece; the cracks produced by the second method are not It has the characteristics of cracks, and it can be seen that other metals have been added through radiographic inspection.

The cracks produced by the third method are real cracks, but it is difficult to control the depth, height and length of the cracks, and it is difficult to achieve the crack size that meets the requirements. Even if it is done, it will cost a lot, and the success rate is very low.