Question
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 place).
Answer :
0.7
Given data,
Welding current, I = 250 A
Voltage, V = 20 V
Welding speed, v = 5 mm per second
Arc heat transfer efficiency, η = 70%
Heat required per unit length,
Hs = VI×η/v = 250 × 20 × 0.7 / (5 × 1000) = 700/1000 = 0.7 kJ/mm
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