A 900 mm long steel plate is welded by manual metal arc

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A 900 mm long steel plate is welded by manual metal arc welding process using welding current of 150 A, arc voltage of 20 V and welding speed of 300 mm/min. If the process efficiency of is 0.8 and surface resistance is 36 micro-ohm, the heat input in J/mm

1. 600 J/mm
2. 480 J/mm
3. 146 J
4. 116.5 J

Correct Option: B

Heat Input to weld

= η	VI	=	0.8 × 20 × 150	= 480 J/mm.
	V		300/60