Types of erw welding are following below:
Spot welding
Spot welding (Spot Welding) welding member is assembled into lap joints, and pressed between two cylindrical electrodes, the use of a hot-melt resistance of the base metal, resistance welding solder joint formation. Mainly used for spot welding sheet metal welding.
Seam welding
Seam welding (Seam Welding) and spot welding process is similar, but with a disk-shaped rotating wheel columnar electrode or electrodes, the weldment assembled into lap or butt joints, and the electrodes disposed between the two rollers, the welding pressure rollers and rotating member, continuous or intermittent power transmission, resistance welding method for forming a continuous weld.
Butt welding
Butt (Butt Welding) is to make the weldment along the entire contact surface resistance welding method of welding.
Projection welding
Projection welding (Projection Welding) is a variant form of spot welding; on a workpiece has preformed bumps, when the projection welding, one can form one or more of the nugget at the joint.
