A weld current generating apparatus includes a voltage conversion circuit, a control circuit, and a charge/discharge circuit. The voltage conversion circuit receives an AC voltage from an AC voltage input terminal and converts the AC voltage to a DC voltage. The control circuit receives the DC voltage and outputs control signals. The charge/discharge circuit receives the DC voltage and is charged by the DC voltage or discharged according to the control signals. The charge/discharge circuit outputs a continuous weld current during discharging process.