Abstract
Recently, Car makers have required a light weight of vehicles in relation to fuel efficiency. In that respect, dissimilar welding method is very important in the car body assembly process. In this study, resistance spot welding was performed to evaluate the welding quality and mechanical properties for dissimilar materials of the cold rolled DP590 and Al 5052. The welding experiment was carried out changing with the welding current and the other process parameters such as electrode force, weld time, squeezing time and holding time were fixed with the basic welding condition of the ISO18278-2 standard. Especially, the shear tensile strength was evaluated at each condition and the cross-sectional observation for weld zone such as nugget diameter was performed. As a result, the thickness of IMC (Intermetallic Compound) layer at 11.5 kA was thinner than those of 9.5 kA and 10.5 kA conditions. On the other hand, Delta-spot welding experiment was performed using various process tapes at welding current of 11.5 kA. The other conditions were same with that of the conventional spot welding. Sound welds was formed by applying to the optimum welding conditions in the Delta-spot process due to the thermal balance of dissimilar materials.
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