Power supply in Arc Welding

The primary functions of the power source are to produce sufficient heat to melt the joint and to generate a stable arc and metal transfer. As the welding processes require high current (50-300A) at relatively low voltage (10-50V),the high voltage mains supply (230 or 400V) must be reduced by a transformer. There are three types of power supply in arc welding – DCSP,DCRP & AC?

DCSP (Direct Current Straight Polarity) - Work piece connected to positive and Electrode to negative. 2/3 heat is generated on positive side. Depth of bead penetration is deep and width of the bead/pass is narrow.

DCRP (Direct Current Reverse Polarity) - Work piece connected to negative and Electrode to positive. 2/3 heat is generated on positive side. Depth of bead penetration is shallow and width of bead/pass is broad. AC (Alternating Current) - It is a combination of both DCSP & DCRP?

AC (Alternating Current) - It is a combination of both DCSP & DCR

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