Electrode displacement monitoring device and method for resistance spot welding and resistance spot welding device

Abstract

The invention discloses an electrode displacement monitoring device. The electrode displacement monitoring device comprises a tooling arm, two displacement sensing devices and a controller, wherein the tooling arm with a protruding end extending to an electrode side is fixed on a welding equipment body; the two displacement sensing devices are disposed at intervals on upper and lower part of the protruding end of the tooling arm so as to respectively obtain height displacement amount of an upper electrode retaining portion and a lower electrode retaining portion; and the controller is used for receiving the height displacement amount of the two displacement sensing devices, determining and outputting change amount of electrode displacement. The electrode displacement monitoring device has the advantages that measurement error caused by dynamic changes of electrode force can be overcome in real time, cumulative measurement error is small, and no expensive sensing device is needed. Based on the electrode displace monitoring device, the invention further provides a resistance spot welding device using the monitoring device and an electrode displacement monitoring method.

Description

technical field [0001] The invention relates to a welding parameter monitoring method in the field of welding technology, in particular to a monitoring device, method and resistance spot welding equipment for electrode displacement in resistance spot welding. Background technique [0002] As we all know, in the resistance spot welding process, the electrode displacement refers to the displacement change of the upper and lower electrodes caused by the thermal expansion displacement during the formation of the nugget, and its value is defined as the value reflected in the resistance spot welding monitoring parameters. One of the ideal parameters for nugget quality. Obviously, obtaining accurate electrode displacement variation directly affects the evaluation of solder joint nugget quality. [0003] The traditional thermal expansion displacement monitoring method is to only detect the movement displacement of the upper electrode, that is, the movement displacement of the cylin...

AI Technical Summary

Problems solved by technology

Limited by its own structure, this method has the problem of error accumulation and amplification, so that the measurement accuracy of the displacement sensor must be increased from 1 micron to 0.1 micron, thus greatly increasing the cost of the sensing and measuring device

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