External Induction

Mutual Induction

Core Induction

Mutual Reduction

Less initial cost

Less maintenance cost

Not suitable for welding of Non-ferrous metals

Freedom from Arc blow

Reduces AC voltage

Increases AC voltage

Convert AC into DC

Increases AC current

Higher working efficiency

Lower working efficiency

No noise

Less maintenance cost

To convert AC into DC

To take AC main supply

To rotate the Armature

To supply DC for welding