Q. A gas tungsten arc welding operation is performed using a current of 250 A and an arc voltage of 20 V at a welding speed of 5 mm/s. Assuming that the arc efficiency is 70%, the net heat input per unit length of the weld will be __________kJ/mm (round off to one decimal place).
Ans: 0.7
Sol:
Welding current, I = 250 A, Voltage, V = 20 V, Welding speed, v = 5 mm/sec
Arc heat transfer efficiency η = 70%
∴ Heat required per unit length
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