A 900mm long steel plate is welded by manual metal arc welding process using welding current of
150A arc voltage 20V and welding speed of 300m/min, if the process efficiency is 0.8 and surface
resistance is 36 µ , calculate heat input.
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= η
VI
=
0.8 × 20 × 150
= 480 J/mm.
V 300/60
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