Divine Metal & Alloy For pipes or tubes of size 4 inches (10.2mm) OD and underneath, strip is taken care of into a bunch of framing rolls, which comprise even and vertical rollers so positioned as to step by step from the level strip into a cylinder, which is then permitted to pass the welding cathodes. The cathodes are copper circles associated with the option of a rotating transformer. The copper circle anodes connect on each side of the crease, and the temperature is raised to the welding point. The outside streak is taken out by a cutting device as the cylinder leaves the cathodes, and the inside streak is eliminated either by an air hammer or by running a mandrel through the welded tube after the cylinder has been cooled. This is called an electric Opposition welded (ERW) tube or pipe.
