Pure aluminium

Copper silver alloy

Columbium stainless steel

Copper coated mild steel

Spark

Smoke

Back fire

Flash back

It converts to low voltage high current ampere

It converts to high voltage and low current ampere

It converts to low voltage and low current ampere

It converts to high voltage and high current ampere

More initial cost

Not free from arc blow

More maintenance cost

Not suitable for welding non ferrous metal

Rectifier set

Motor generator set

Engine generator set

AC welding transformer