What is difference between A.C arc welding and D.C arc welding ?

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Points to pounder –

AC power sources are commonly used for shielded metal arc welding, submerged arc welding, and TIG welding (for aluminum).

AC power sources vary according to the method of adjusting welding currents. Welding currents can be adjusted by changing reactance, open circuit voltage and resistance.

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DC power sources are commonly used for shielded metal arc welding, submerged arc welding, TIG welding, and gas shielded metal arc welding. DC power sources can be classified by structure into rotary and static types, and further by the method of generating welding current into motor-generator, engine-driven, and rectifier types