A gas t ungst en ar c wel di ng oper at i on i s performed

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A gas t ungst en ar c wel di ng oper at i on i s 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).

1. 0.1
2. 1.4
3. 0.7
4. None of these

Correct Option: C

Net heat input per unit length,

H_t =	V.I	× η
	v

V = voltage, I = current, A
v = welding speed

H_t =	20 × 250	× 0.70
	5

H_t = 0.7kJ/ mm