Factorial Analysis of Welding Current Influence on Heat Affected Zone Hardness of Cast Iron, Aluminium, and Mild Steel Weldments Cooled in Palm Oil

Table 1

Variation of materials with welding currents and voltages.

Material	C/Type	W/C	W/V
Aluminium	D.C	120	280
Cast iron	A.C	180	220
Mild steel	A.C	180	220