| 摘要 |
A large diameter stud and a method and apparatus for welding same are provided. The large diameter stud has a protruding tip at a weldable end thereof containing a solid rod-like body of flux. A ceramic ferrule which can have a two-step cavity surrounds the weldable end portion of the stud when engaged with workpiece to which it is to be welded. An arc blow coil surrounds the ferrule and is spaced therefrom with powdered flux therebetween and above the ferrule. The arc blow coil is attached to adjustable legs of a welding tool and has a weight thereon to aid in supporting the welding tool upright on the workpiece during the welding operation. In the welding cycle, a relatively low weld current is used for the main welding arc and is maintained for an extended period of time. Current through the arc blow coil is initiated when the welding cycle begins and is gradually increased to a maximum at an intermediate point in the welding cycle. |
