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Method for judging failures of spot-welded joint under recombination action

A composite effect and welding head technology, applied in welding equipment, resistance welding equipment, manufacturing tools, etc., can solve problems such as reservation, not deep enough, and no clear methods and steps, and achieve the effect of improving simulation accuracy

Inactive Publication Date: 2015-07-22
SHANGHAI UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For automobile collision simulation, the traditional spot welding simulation uses the whole vehicle simulation first, and then checks the force of the solder joints, so it is impossible to judge the failure of the solder joints during the collision process
Although foreign scholars have done a lot of work on the mechanism of solder joint failure, they still have reservations about the specific methods of solder joint failure simulation and solder joint failure criteria, and there are no clear methods and steps yet.
However, domestic researchers are mostly limited to the study of the impact of different types of solder joint units on the impact simulation accuracy of thin-walled parts, and the research on specific simulation methods for solder joint failure is not deep enough, leaving many problems to be solved

Method used

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  • Method for judging failures of spot-welded joint under recombination action
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  • Method for judging failures of spot-welded joint under recombination action

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Embodiment Construction

[0040] The method for judging the failure of the spot welded joint under the composite action of the present invention comprises the following steps:

[0041] Step 1. Prepare the sample, the specific steps are as follows:

[0042] Step 101, welding the double U-shaped spot welding sample, the flanging peeling sample, the torsion sample and the test nugget diameter sample, the welding parameters and the size and standard of the electrode tip used for welding should be consistent with the welding process on the actual production line Similarly, strive to make the solder joints on the sample the same as the solder joints on the actual component, and reduce the error as much as possible.

[0043] Step 2, carry out double U-shaped spot welding sample test, the specific steps are as follows:

[0044] Step 201, the double U-shaped spot welding sample test can be started after the sample is welded, and the double U-shaped spot welding sample is fixed on the fixture of the double U-sh...

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Abstract

The invention provides a method for judging failures of a spot-welded joint under the recombination action. The method includes the following steps that firstly, a sample is prepared; secondly, a double-U-type spot-welded sample test is carried out; thirdly, an edgefold stripping test is carried out; fourthly, a torsion test is carried out; fifthly, a welding spot nugget diameter test is carried out; sixthly, failure criteria parameter processing based on resultant force is carried out; seventhly, failure criteria parameter processing based on stress is carried out. By means of the method for judging failures of the spot-welded joint under the recombination action, the failure conditions of the welding spot can be accurately predicted, and the simulation precision of car collision is improved.

Description

technical field [0001] The invention relates to a failure technology of resistance spot welding, in particular to a method for judging the failure of a spot welding joint under combined action. Background technique [0002] In the manufacture of various parts of automobiles, spot welding has the advantages of light weight, good reliability, stable performance and easy automation. In the load-bearing body of modern cars, it is the most important body assembly process. The quality of these solder joints will directly affect the performance of the car body, such as strength, impact and compression resistance, fatigue performance, etc. With the continuous expansion and deepening of the application field of advanced high-strength steel, its resistance spot welding performance has been widely concerned by people, and the welding point strength of advanced high-strength steel has an important impact on the performance of the whole vehicle. [0003] In recent years, with the rapid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/12B23K11/11
Inventor 王武荣韦习成孙晓屿黄雷刘成杰
Owner SHANGHAI UNIV
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