A low carbon steel is to be welded by the manual metal arc welding process using a linear V – I characteristics DC power source. The following data is available.
O.C voltage of the power source = 62V,
S.C current for the setting used= 130A,
Arc length = 4mm,
Traverse speed of welding = 15cm/min
Efficiency of heat input = 85%
The relation between the arc length L in mm and arc voltage V is V = 20 + 1.5L
Calculate the heat input into the work piece.