There are two kinds of supply modes of collecting electrode resistance (inner and outer) in the voltage-steadied circuit in which series connection transistor is used.

First, the electricity at the beginning of the operation, the bottom electrode of low resistance, good electrical conductivity, without any preheating, nor will launch electrode can launch.

For the electric welding machine two secondary side wiring and electrode holder, welding connection cable, its characteristic is high, low voltage resistance.