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Abstract
Resistance spot welding process (RSW) is one of remarkable manufacturing processes in automotive industry. There are several process parameters; quantum of weld current, weld time, and electrode force which affect the weld nugget formation and its strength. Therefore, it is necessary to optimize the process parameters of RSW. In this paper spot welded joints of similar sheets thickness have been welded. The tensile specimens have been made according to AWS standard. The optimal parameters for welding machine are evaluated by using Design Expert Program. The tensile shear tests presented three failure modes, interfacial, partial interfacial and pullout failure. These modes related to diversity metallic composition of each steel type and the variance of the sheet thickness.
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