Camarc Compact 300 MIG Welding Machines These heavy duty MIG welding power sources have been designed to provide the additional "punch" required for welding at higher currents and duty cycles. Despite the high current and duty cycle, each set retains superb arc characteristics throughout its full range and delivers smooth welds in both dip and spray transfer. This is due to the high number of voltage settings and good arc control from the three choke settings.