Method and device for monitoring electrode wear state of resistance spot welding tongs

Abstract

A method and device for monitoring the wear state of electrodes of resistance spot welding tongs, the method comprising the following steps: S1: Detecting the pressing amount of electrodes of welding tongs during each resistance spot welding process, and detecting whether there is a wear state during each resistance spot welding process. Splatter phenomenon; S2: Judging whether the pressing amount of the electrode of the welding tongs is greater than the threshold of the pressing amount; S3: Counting the latest resistance spot welding process of the first set number of times, the pressing amount of the electrode of the welding tongs is greater than the pressure The total number of times the spatter phenomenon occurs when the amount is inserted into the threshold; S4: compare the total number of times the electrode of the welding tongs is pressed in greater than the amount of indentation threshold and the splash phenomenon occurs with the second set number of times, if the If the indentation amount of the electrode of the welding tongs is greater than the indentation amount threshold and the total number of occurrences of the spattering phenomenon is greater than or equal to the second set number of times, a prompt for grinding the electrode of the welding tongs is issued. The method can more accurately monitor the wear state of the electrode without stopping production, thereby improving production efficiency.

Description

technical field [0001] The invention relates to the technical field of vehicle manufacturing, in particular to a method and a monitoring device for monitoring the wear state of electrodes of resistance spot welding tongs. Background technique [0002] In the process of resistance spot welding of body-in-white, after a certain number of welding spots are welded, a certain amount of oxide will be formed on the electrode surface of the electrode cap, which will seriously affect the welding quality, and the electrode surface needs to be re-grinded. Resistance spot welding can be performed again to ensure the quality of resistance spot welding. [0003] In the automatic body production line, under normal circumstances, a welding tong needs to weld different grades of metal materials at different times. For example, it may successively weld sheet metals of various materials such as low alloy steel, high strength steel, and hot-formed steel. This makes it difficult for technicians...

AI Technical Summary

Problems solved by technology

However, since this specified number of times is set based on past experience, this method will cause the following problems. During the grinding cycle of the welding tongs electrode, it is possible that the welding tongs electrode has reached the required number of welding times. In this way, the electrode of the welding tongs will work with a disease, which will affect the quality of the product. It is also possible that when the specified number of times of welding tongs is reached, the electrode of the welding tongs has not yet reached the state of needing to be repaired. Grinding, which will shorten the service life of the electrode of the welding gun and increase the production cost

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