Medium frequency, direct current (MFDC) inverter technology, microprocessor controlled resistance (spot) welding machine with pneumatic water-cooled clamp. In comparison with traditional spot-welders, the POWER CLAMP technology (power circuits integrated in the clamp) allows for high spot-welding currents with low absorption rates (the spot welder operates on mains by 16A fuses), the use of longer (5m) and lighter cables for a better holding and a wider range of action and minimum magnetic fields around the cables. It is particularly suitable for body shop applications and industrial use and gives excellent results also on high strength steel (HSS)/boron and galvanised metal sheets.