Connection characteristics comparison of rapid quenched Mg and Cu alloy foils by micro-type energy-storage spot welding

The connection characteristics of rapid quenched Cu-40wt%Co and AZ91D Mg alloy foils has been studied using a self-developed micro-type energy-storage welding machine. The ideal connecvtion joints have been obtained. The spot welded joints of both AZ91D Mg and Cu 40wt% Co alloy foils are composed of nugget,heat-affected zone. The joint morphology of Mg alloy foils is characterized by a regular ellipsoidal nugget, while those of Cu alloy foils exhibit the flat nugget. To obtain the high quality spot welded joint,the welding parameters are determined as: welding energy 1.5~2.0 J, welding voltage 80 V, and electrode pressure 10~20 N for AZ91D Mg alloy foils; and 6.0~8.0 J; 80~100 V;and 4~8 N for Cu-Co alloy foils respectively.