Welding two pieces of metal together, end to end, is called butt welding. In butt welding the ends are cleaned and made square so that the two pieces touch each other over the entire cross-section. One piece is held in stationary clamps (Refer to Fig) and the other piece in movable clamp.
Butt welding (ERW)
The movable clamps bring the two pieces to be welded together end to end. Then the current is switched on heating the ends quickly. Then the movable be clamps close in with pressure and hold the two pieces together under pressure until the butt weld is made. Obviously, the material around the joint upsets and has to be cut and thrown away.
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