Correct option is D
Upset Butt Welding (UBW) is a
resistance welding process used to join two components (typically metal bars, rods, or wires) by applying
heat generated from electrical resistance and
forging pressure. It is widely employed in industries for joining
solid components to create a
strong, permanent joint.
Upset butt welding is mainly used for the manufacture of welding bars, rods, wires or tubing. For the manufacture of automobile parts, such as axles, wheels or frames, flash butt welding is extensively used.
