A method of making a crack defect test piece

Abstract

The invention relates to the field of nondestructive inspection, in particular to a crack defect test piece manufacturing method. The method comprises the steps of making a test panel I with a 30-degree groove and a test panel II with a 30-degree groove opposite to each other, and conducting bottom welding with the manual tungsten argon arc welding method by adding welding wires TIG-J50; placing copper welding wires where crack defects are required to appear, and conducting filler welding by adding welding wires TIG-J50; not adding welding wires TIG-J50 when welding is conducted at the position where copper welding wires are placed; conducting sublevel welding and cosmetic welding by adding welding wires TIG-J50; conducting water-cooling on a test piece as soon as welding is completed, and then hammering the test piece. The manual tungsten argon arc welding method is adopted, processes are simple and convenient to implement, the requirement for the technical skill of a welder is not high, and the overall manufacturing cost of the test piece is low; the direction, length and number of cracks can be controlled as needed; more real crack defects can be obtained by determining welding parameters in each step.

Description

technical field [0001] The invention relates to the field of non-destructive flaw detection, in particular to a method for making a crack defect test piece. Background technique [0002] Non-destructive testing technology is an important means to achieve quality control, improve technology, reduce costs, and ensure safe operation of equipment. It has become an indispensable and important part of the manufacturing and use of modern industrial products. [0003] According to the survey, many units have to use test pieces with crack defects when conducting non-destructive testing personnel forensics and ASME forensics. However, the supply of such test pieces in the society is scarce, the price is expensive, and the linear defects of machining are not real, so it is difficult to meet the requirements. The actual demand for testing personnel training, examination, and evidence collection. Correct analysis of welding cracks, on the one hand, can find out the cause of defects, so ...

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Problems solved by technology

[0004] In 2009, the patent application document of "A Method for Making Surface Crack Defect Test Block for Non-destructive Testing" with the Chinese Publication No. CN101576450 disclosed that a certain amount of sulfur element was added to the weld bead to obtain crack defects. The cracks obtained by this method The direction, length, etc. are not easy to control and have uncertainty

In actual production, some test pieces with crack defects are made by adding cast iron welding wire, but the weldment plates selected for the test pieces are 20G, 16MnR and other alloy steels used for pressure vessels. Structural steel weldment plates are not universal

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