L type MFDC Spot & Projection Welder DB-110KVA

It is a kind of resistance welding process using MFDC inverter power supply. The power input is three-phase power frequency while the output is single-phase medium frequency. The increase in frequency results in a significant reduction in the size of the welding transformer. The welding time is measured in milliseconds, with high concentration of welding energy and the workpiece is positioned between upper and lower electrodes. The welding current and time are controlled by a medium frequency inverter resistance welding controller, while the electrode pressure is adjusted accordingly. After that, the pressure between the electrodes is set, and when the high current passes through the welded part, the high temperature generated by the contact resistance melts the welded base material and forms the weld nucleus, which significantly reduces power grid demands compared to AC single-phase welding power sources.