Abstract
We welded commercially pure titanium sheet to aluminum alloy A5052 sheet using a method of resistance spot welding with a cover plate, and investigated the mechanical properties and interfacial microstructure of the joint. The interfacial microstructure was observed using transmission electron microscopy. An approximately 160 nm thick layer of Al solid solution supersaturated with Ti was observed at the welding interface, in which contain the precipitates TiAl3. Mechanical property analysis suggests that the reaction layer has no effect on the tensile shear load of the joint.
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