1)Tensile-shear test: Measures the force required to break the weld, which indicates its strength. 

2)Peel test: Examines the fracture shape and nugget size to assess overall weld quality. 

3)Chisel test: Used when a peel test is not feasible. A chisel is driven between sheets next to the weld to check its integrity. 

4)Bend test: Verifies component performance under stress by bending the welded part.

By conducting these destructive tests on the parts, you can establish the optimal weld parameters for the work pieces.