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During a resistance spot weld, a current of several kiloamperes passes through a stack of sheets clamped between two electrodes. We are interested here in the very first moments of the welding, when the combined effects of electrical and thermal contact resistances at sheet/sheet (S/S) and electrode/sheet (E/S) interfaces are at the origin of intense overheating. In order to estimate the contact temperatures, non-contact infrared thermography measurements coupled with an instrumentation by micro-thermocouples welded on the sheets are performed. The evolution of the emissivity is measured and the temperatures at the interfaces are evaluated.

Contact temperature measurement by infrared thermography during resistance spot welding process