Special Arc: this function permits to keep the current /tension ratio stable although the electrode distance from the material changes during the welding process. This allows the operator to have an ever constant welding arc. Special point: a welding arc vibration allows to obtain the union between two separated pieces easily and efficiently. it is an ideal way to point andto prepare the bath for a dc welding. Up/Down Control: selecting the function easily (from the front panel) it is possible to adjust the current supplied directly from the torch buttons.