Punto Star 1345 inverter spot welder has variable frequency. Weld with constant currency and wire feed regulation from the light weight carbon fiber gun. Heavy transformer is in the cabinet not on the gun. Carbon fiber gun arms and electrode are water cooled. 3 phase 230V 50/60, 560 daN 13,000 amps. Welding capacity is 2.5mm + 2.5 +2.5