Question

Two sheets of different materials but same thickness can be spot welded by

Answer 1

Electrodes for Spot Welding Different Thickness Sheets of Same Material

(ii) For sheets of different materials but the same thickness, resistance will depend directly on resistivity. Thus, more heat will be gener­ated in a material with higher resistivity (or lower conductivity).

Therefore, use an electrode with larger diameter on high resistivity (or lower conductivity) material. Alternatively use electrode with high resistivity tip on the lower resistivity.