Two sheets of low carbon steel of 1.5mm thick each are spot welded by passing a current of1000 amps for 5 cycles on 50 Hz main supply.
i) What is the heat generated due to the supply of power if effective resistance has 200micro ohms.
ii) The maximum indentation is 10% of sheet thickness and density of the spot weld nugget 8 gm/cc. if 1380 Joules are require to melt 1 gm of steel, determine heat required for welding operation if d = 6SRT (t) to determine nugget to be equal to metal between the two electrodes.