Method for establishing welding spot quality detection standard

Abstract

The invention discloses a method for establishing a welding spot quality detection standard. The method comprises following steps: manufacturing a welding spot sample; detecting the welding spot sample by ultrasonic waves; obtaining the characteristic parameters of the returned ultrasonic signals of the welding spot sample; subjecting the welding spot sample to a metallographic test to obtain thegeometric parameters of the welding spot sample; establishing a welding spot finite element model, whose geometric parameters are different from those of the welding spot sample, by computer software;giving a damping coefficient to the finite element model, calculating the attenuation coefficient, applying an ultrasonic excitation signal, calculating the characteristic parameters of the returnedultrasonic signal by computer software; counting and analyzing the characteristic parameters; and based on the distribution rule of the characteristic parameters, determining a method for judging thewelding spot quality namely a welding spot quality detection standard. The data credibility of established quality detection standard is improved, and solved are the problems that the data can only beobtained through actual detection, the test time is long, and the credibility of established quality detection standard is low due to small data quantity and insufficient test data species.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing of solder joints, and in particular relates to a method for establishing a quality testing standard of solder joints. Background technique [0002] At present, with the rapid development of automobile technology, people pay more and more attention to the quality and craftsmanship of automobiles. The main way for various automobile manufacturers to connect the sheet metal parts of each module of the automobile body is electric welding. Factors such as the diameter of the welding torch, the degree of wear of the welding torch, voltage and current directly affect the quality of the solder joints, thereby affecting the rigidity and fatigue resistance of the automobile body. In order to ensure the quality of solder joints, major automobile OEMs are paying more and more attention to the quality inspection of solder joints, and have invested a lot of financial and material resources. [...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the efficiency is extremely low, and there is no wide applicability to the establishment of solder joint inspection standards.

Although the characteristic parameters of the corresponding solder joints can be obtained relatively easily by using the existing ultrasonic nondestructive testing technology, the experimental data obtained only through the experiment is still subject to great limitations. For example, the experiment itself is time-consuming and laborious, and the amount of data is limited; The types of points are not complete, and the obtained data is discrete

All of these make the establishment of solder joint inspection standards lack of strong data support

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