Fusing processing method

A fusing processing method comprising:

• inserting a portion of a covered wire to be fused into a receptacle portion of a conductor, both the portion of the covered wire and the receptacle portion of the conductor constituting a workpiece;
• placing the workpiece between a first electrode and a second electrode;
• applying a pressing force to the workpiece through the first and second electrodes so that the first and second electrodes are abutted against the workpiece to be fused;
• segmenting a current-supplying time for a single fusing processing into a plurality of current-supplying periods, to cause a fusing current to flow between the first and second electrodes in a positive direction in odd-numbered current-supply periods of the plurality of current supply periods, and to cause the fusing current to flow between the first and second electrodes in a negative direction in even-numbered current-supply periods of the plurality of current supply periods;
• and
• allowing the fusing current to flow between the first and second electrodes without flowing through the covered wire immediately after initiation of the current-supplying time and to then flow through a conductor of the covered wire after an insulator of the covered wire is removed.