Dissimilar resistance welding of C1020/SUS304 plates using Zr-based metallic glass ribbons as interlayers

We have demonstrated dissimilar resistance welding of CP-Ti/SUS304 plates with and without interposing Zr₅₅Al₁₀Ni₅Cu₃₀ metallic glass ribbons as interlayers. CP-Ti has higher melting point and lower thermal conductivity in comparison to aluminum alloys. To clarify the effect of the melting point and thermal conductivity of the plates, C1020, which has high melting point and high thermal conductivity, was used instead of CP-Ti. The joint strength of the welded specimens without the metallic glass ribbons was lower than that of those with the ribbons, when a higher electrode load was applied. Similar load-displacement curves of the tensile shear tests were obtained with interposing the glassy ribbons when lower electrode load was applied. The number of the welded specimens exhibiting joint strength higher than 1000 N increased when a lower electrode load was applied with interposing the metallic glass ribbons. The reproducibility of load-displacement curves of the tensile shear tests was increased by the glass transition to a supercooled liquid of the metallic glass ribbons upon resistance heating during welding. Because the excess supercooled liquid was extruded from the nugget by the applied electrode load, and the welding condition was unified independent of the applied load, resulting in similar load-displacement curves.