Improved oblique-Y-shaped groove welding crack sensitivity test sample and manufacturing method thereof

Abstract

The invention discloses an improved oblique-Y-shaped groove welding crack sensitivity test sample and a manufacturing method thereof. The sample comprises a test welding line located in the middle of the sample and does not include a restraint welding line, wherein a groove applied to the test welding line is oblique-Y-shaped; the root gap of the groove is 2mm+ / -0.1mm. Through the sample, the restraint welding line is eliminated; the groove applied to the test welding line and the root gap are directly processed in the middle of the sample by using a mechanical method; the accuracy of the root gap can be greatly improved; residual stress and angular deformation are not generated; the reliability of test result of welding crack sensitivity of the material is improved; meanwhile, the consumption of manpower and financial resources can be reduced.

Description

technical field [0001] The invention belongs to the technical field of metal material welding, and in particular relates to an improved inclined Y-shaped groove welding crack sensitivity test specimen and a manufacturing method thereof. Background technique [0002] Steel materials are widely used in petroleum, chemical, nuclear power, marine engineering and other industrial fields, and a large amount of steel is applied by welding. Whether a material can be welded, and how it performs after welding, that is, weldability, is an important direction for materials research. Among the weldability test methods of steel materials, the most widely used is the small iron research test, that is, the oblique Y-shaped groove welding crack test method, which was once formulated as the national standard GB 4675.1-84 "Weldability Test Oblique Y-shaped slope Welding Crack Test Method", which was abolished in 2005, and the relevant content was incorporated into the new national standard GB...

AI Technical Summary

Problems solved by technology

my country is currently the number one country in the world's steel production and application. This method is used to conduct a large number of material weldability tests every year. figure 1 It is the shape and size of the test piece stipulated in the standard of this test method. An obvious shortcoming of this method is that it is difficult to effectively guarantee the root gap (2mm±0.2mm) during the test piece manufacturing process, and the root gap reflects the degree of restraint, which is a part of the test process. An important parameter that has a significant impact on crack susceptibility

Generally, the method of adding 2mm iron sheet at the root and the method of reserving an excessive gap are used to make the test pieces. Even so, many test pieces are abolished because they do not meet the dimensional accuracy requirements. For this reason, the invention patent with the application number 201510244559.3 and the application number 201510012348.7 The invention patent provides a test piece production method to ensure the root gap. The production process adopts the method of first reducing material (processing two sub-test pieces) and then adding material (welding restraint weld), but the essence is still using the method of welding restraint weld Make the test piece so that welding residual stress and angular deformation will occur when welding the restrained weld, and this residual stress and angular deformation will change with many factors such as the welding method, parameters and welder's operation mode of the restrained weld, which is a formal Uncertain external forces caused by test welds affect accurate evaluation of material weld crack susceptibility

In addition, the welding of restrained seams requires more complex procedures such as assembly, welding, interlayer cooling, and deformation control, which requires highly skilled welders to complete, which will also cause a lot of manpower and financial resources.

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