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
To convert AC into DC
To take AC main supply
To rotate the Armature
To supply DC for welding