Abstract
Resistance spot welding has established itself across a wide range of industries as a cost-effective method for joining steel sheets. In modern vehicle manufacturing in particular, steel sheets of varying strengths, quality and surface treatment need to be joined. One of the problems of resistance spot welding in the automotive industry is the lifetime of welding electrode tips. The new innovative method of resistance spot welding DeltaSpot should solve this problem by using the special process tape between welding electrodes and joining materials. The paper describes the principle of DeltaSpot welding method and evaluates the properties of DeltaSpot joints made by combination of galvanized steel sheets DX51D+Z (a0 = 0.9 mm) and RA-K 40/70+Z100MBO (a0 = 0.77 mm). The basic mechanical properties of welded joints were evaluated. Some samples were prepared for metallographic analysis where the influence of the welding parameters on the structure of welded joint was observed. The properties of DeltaSpot joint were compared to the properties of standard resistance spot joints.
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