Resistance Spot Welding of SUS304/CP-Ti Plates Using Inserted Stacking Metal Foils with Zr₅₀Cu₄₀Al₁₀ Supercooling Alloy Composition

Abstract

Dissimilar metallic joining was performed by resistance spot welding of SUS304/CP-Ti plates, where stacking of Zr, Cu and Al foils with Zr₅₀Cu₄₀Al₁₀ supercooling alloy composition were placed between the plates as inserted materials. The microstructure in nuggets depends on the stacking sequence of the inserted foils. The size of cavity formed in the nuggets was smallest, no cracks were found in the nuggets and the welding boundary between the nugget and the SUS304 plate was undulated finely for the welded specimen exhibiting the highest tensile shear strength. No metallic glassy phase was found in the nuggets, but the composition of crystalline phase formed in the nuggets was close to high glass-forming alloy, i.e. high supercooling alloy, Zr₅₀Cu₄₀Al₁₀.