Abstract
Resistance spot welding of commercial pure titanium and aluminium alloy 6061-T6 is carried out. The microstructure and tensile shear properties of the weld joints are studied. There is a critical range of welding current at which the reaction between liquid aluminium and solid titanium changes to a reaction between liquid aluminium and liquid titanium. The microstructure in the aluminium side is a type of transition structure, which is considered to be the same microstructure that connects the columnar dendrite and equiaxed dendrite in similar aluminium alloy resistance spot welding. The welding current has the largest influence upon the tensile shear properties of the Al/Ti weld joint, while the welding time has a small effect and the electrode force has virtually no effect.
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