Welding power supply system

The invention provides a welding power supply system which can automatically work at the time of welding start of submerged arc welding and inhibit impurities from being mixed into a welding bead after welding. A welding system (A1) for performing submerged arc welding is provided with: a welding power supply device (2) that has an inverter circuit (25) and supplies power; a welding wire feeding device (5) for feeding a welding wire; and a control device (1) for controlling the welding power supply device (2) and the welding wire feeding device (5). The control device (1) causes the welding wire feeding device (5) to feed the welding wire in the forward direction at the start of welding, causes the welding power supply device (2) to output a start current when the tip of the welding wire is in contact with an object (W) to be welded, and causes the welding power supply device (2) to output a start current from the contact of the welding wire to the start of the forward feeding at a first speed for welding. A