Aresistance spot welding operation is performed on two pieces of 0.040 in thick sheet steel with unit melting energy of 150 btu/in3. it takes 9500 a and 0.17 sec to complete a weld nugget of φ0.190 in and 0.060 in thick.
assume the resistance of 100 micro-ohms. a) calculate the average power density in the interface area defined by the weld nuggetb) find the percentage of energy generated that went into formation of the weld nugget (i. e, calculate the ratio eweld / esource)