Narrow-gap GMAW (gas metal arc welding) method for band electrode

The invention relates to a narrow-gap GMAW (gas metal arc welding) method for a band electrode, which solves the problem of incomplete sidewall fusion of an existing narrow-gap welding process. The method includes the steps: firstly, using the band electrode with a rectangular section as a consumable electrode, leading the band electrode into an electrode clamp in a welding gun by the aid of a band electrode feeding mechanism, placing the welding gun into a gap of a workpiece to be welded and leading the width direction of the band electrode to be perpendicular to a welding direction; and secondly, leading in shielding gas, adjusting voltage, starting a welding power supply, feeding the band electrode, igniting arcs and performing welding to complete narrow-gap GMAW for the band electrode. By the aid of the method, complete sidewall fusion is realized, and the defects of porosity, inclusion and the like are avoided. Welding parameters are fewer, the method is simple, operation is convenient, equipment is simple, the cost is low, and the method is used for the field of gas shielded welding for the consumable electrode.