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Resistance butt welding is a method that compacts two workpiece end, uses the resistance heat,until plastic state, then adds the forge force quickly (or does not add forge force,but only maintains welding pressure), completes the welding at last. the welding process is simple, puts away the workpiece, then steps on the switch with foot, the welding efficiency is high.after welding, the attaches are smooth. The burr is small.