RSN-2000/2500X Drawn-Arc Stud Welding Machine (Heavy Industry) Models covered: RSN-2000 / RSN-2500X Key Features IGBT module soft-switching inverter with full digital design and high integration. Light and compact with castors for easy movement. Wide current adjustment range, stable arc and ample power. Clear digital display of welding current and welding time. Automatic or manual operating mode to suit different operator habits. Complete protection circuit with fault display