1. FTT is offered, which is available for deleting the little melting ball in the and of electrode and for next are striking.

2. the main circuit controlled by thyristor commutation. The output voltage and current can be regulated successively. It can exert welding capability from narrow range to large range.

3. it provides over-load protection to avoid machine destroyed when operating by accident.

4. auto power off is offered, it serves the purpose of welding with consumable aluminum electrode.