... stored spot welding programs INVERTER SPOT WELDING SYSTEM with USB 16000A 1.Brife: S12-3GUN is ideal for car-body works ... Single Pulse, Double welded, Pulse welding, No spark welding.Display system: 8"LCD Display Functions: Air pressure, Voltage testing, Offset ... Thermal protections, cooling fluid monitoring, USB data storage.Cooling System: Water cooled C-gun/X-gun/Arm sets/Transformer/Radiator3 ...