Welder is one of the basic forms of resistance machines, mainly cross-section profiled the same or dissimilar materials the use of the end of the contact resistance heating and then pressurized, it is firmly connected together. The series welder for welding low carbon steel, medium carbon steel, alloy steel, high temperature alloys and copper, aluminum and its alloys and other materials, as well as welding carbon steel - tool steel, copper - aluminum welding dissimilar materials.

This series of welding machine is widely used in the welding car (motorcycle) wheels, chain ring, sheets, rails, pipes, etc..