SW802 Series Portable Spot Weld Heads is widely used in chip inductors, SMD transformers, high frequency communication devices, inductive IC card, micro information ringers, watch coil, Micro Motor Rotor Spot Welder, UF40 inverter welder, 380V 3-phase, water-cooling,40% duty cycle, MAX. output current 4500A, welding current up limited and down limited alerk, precision welding control.