Abstract
Resistance spot welding is a process with high productivity and high level of automation. This rises a number of tasks related to development of quality evaluation and process monitoring systems operating in real-time mode which would allow to detect non-compliant joints during the process run of shortly after it is finished. The more complex task is to make such system as much universal as possible, consisting of relatively simple equipment and with a possibility of full automation of evaluation process. Research was focused on electrical welding parameters which determine the thermal cycle of the welding process as well as the state of metal in the welding zone and its plasticity. Experiments were performed for work pieces with different pre-welding state of surface. Developed method also allows to monitor the state of working surfaces of electrodes and to detect splashes with a relatively high accuracy.
Highlights
Resistance spot welding (RSW) is widely used in various fields of engineering: automotive, aircraft, electronics etc
Resistance spot welding is a process with high productivity and high level of automation
This rises a number of tasks related to development of quality evaluation and process monitoring systems operating in real-time mode which would allow to detect non-compliant joints during the process run of shortly after it is finished
Summary
Resistance spot welding (RSW) is widely used in various fields of engineering: automotive, aircraft, electronics etc. This method is characterized by a very high degree of mechanization and automation – both contributing to its high productivity. RSW technology does not require welding materials (fluxes, filler wires, protective gases) and is its environment-friendly - an important indicator for any modern production seeking to meet the high requirements of environmental safety. The main indicator of the quality of the welded joint produced by RSW is the strength of the spot, which is directly affected by its geometric parameters: size, shape and location. Geometry of the welded spot depends on the course of the welding process and its deviations.
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