New Method of Resistance Spot Welding for Dissimilar 1008 Low Carbon Steel-5052 Aluminum Alloy

摘要

The resistance spot welding (RSW) joining the dissimilar alloys such as aluminum alloy 5052 and low carbon steel alloy 1008. A new technique is developed due to the difficulties in such weldments. Therefore, a circular hole 3 mm diameter in the center of the aluminum alloy was drilled to overcome the high thermal expansion of aluminum. The electrode force 1500-2400 N, welding current 11.25-14.25 KA, and the welding time 25-40 cycle were used. The desired weld nugget has been obtained and the difficulties have been eliminated. The maximum tensile shear load of these dissimilar joints was 3210 N. Weld nugget diameter of 9.75 mm is formed. The intermetallic compound layer (IMC) is noticed with thickness 1-5 μm. The tongue-like shape and needle-shaped of IMC layer adjacent to the 1008 low carbon steel and aluminum sides have been investigated, respectively.