A short-time amplitude modulation control method for resistance spot welding based on spatter statistical feedback

Abstract

A short-time amplitude modulation control method for resistance spot welding based on spatter statistical feedback. According to the welding current and process signal collected in real time, the current timing diagram and process signal timing diagram are respectively established, and the spatter recognition is carried out on the process signal timing diagram to obtain a single welding The time of spatter occurrence; then statistical analysis is performed on the time of spatter occurrence of a batch of solder joints to obtain the statistical time of spatter occurrence and the measured frequency, and the short-time amplitude modulation process parameters are obtained by comparing with the preset spatter frequency range and characteristic calculation; and then according to Short-time amplitude modulation process parameters are used to iteratively optimize the current timing diagram until the preset spatter frequency range is reached or no spatter occurs, and the welding current is set according to the optimized current timing diagram to achieve optimal welding. The present invention combines the current data and historical data to realize the autonomous control of spot welding spatter, which can effectively reduce the frequency of spot welding spatter under different plate combinations, different welding processes and different manufacturing conditions, while ensuring the quality of solder joints and realizing reliable welding. , Efficient resistance spot welding process.

Description

technical field [0001] The invention relates to a technology in the field of welding, in particular to a short-time amplitude modulation control method for resistance spot welding based on spatter statistical feedback. Background technique [0002] Resistance spot welding technology has always been the most important joining process in car body manufacturing because of its advantages such as high production efficiency. According to statistics, there are usually 4,000 to 6,000 solder joints distributed on a car body-in-white, accounting for 90% of the total welding volume of the vehicle. Spatter is the most common defect in resistance spot welding. On the body-in-white welding production line, spatter occurs frequently, and the spatter rate (occurrence probability) of some stations can be as high as 80%. However, the actual spot welding process is very complicated. With the large-scale application of new materials and new structures in the body manufacturing process, in the ...

AI Technical Summary

Problems solved by technology

However, the actual spot welding process is very complicated. With the mass application of new materials and new structures in car body manufacturing, in the actual car body welding process, there are generally large dimensional deviations of stamping parts, impurities such as oil on the surface of the workpiece, and the location of solder joints. Too close to the edge of the workpiece, poor electrode neutrality, electrode end face wear and other working condition fluctuation factors, resulting in severe spot welding spatter and unqualified solder joint quality

Existing spatter control methods mainly rely on off-line process optimization, and do not perform adaptive adjustment of industrial parameters according to real spatter conditions

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