Arc welding method and arc welding apparatus

An arc welding apparatus for arc welding two base materials, at least one of which has a plating layer thereon, by a brazing filler metal, comprising:

• a welding torch which performs arc discharge between the welding torch and the two base materials;
• an arc discharge unit which performs arc discharge by supplying the welding torch with two currents alternately, one of the two currents corresponding to a first current value for removing the plating layer by the arc discharge, and the other corresponding to a second current value which melts the brazing filler metal and is smaller than the first current value;
• a welding torch movement unit which moves the welding torch along a welding line during the arc discharge at the first current value, and stops a movement of the welding torch during the arc discharge at the second current value;
• and
• a brazing filler metal feed unit which does not feed the brazing filler metal during the arc discharge at the first current value, and feeds the brazing filler metal during the arc discharge at the second current value so as to be welded to a position where the plating layer is removed, wherein
• one of the two base materials is a first base material which is an Fe-based metallic member coated with the plating layer containing Zn, the other is a second base material which is an Al-based metallic member, and
• the brazing filler metal is a ZnSi-based brazing filler metal.