Question

A resistance spot welding operation is used to join two pieces of sheet steel (1 in wide, 5 in long, 1/8 in thick) having a unit melting energy of 130 Btu/in3 . The weld duration will be set at 0.25 sec with a current of 11,000 amp. Based on the electrode diameter, the weld nugget will have a diameter of 0.30 in. Experience has shown that 40% of the supplied heat melts the nugget and the rest is lost. If the electrical resistance between the surfaces is 130 micro-ohms, what is the thickness of the weld nugget assuming it has a uniform thickness?

Answer 1