
Electric resistance welding (ERW pipe) is the use of current through resistor between the workpiece and the welding heat generated by the contact surface, the plastic is heated to a weldment or partial melting state, then apply pressure welding method of forming a welded joint. There are four main resistance welding method that spot, seam welding, projection welding, butt welding. Electric resistance welding is the workpiece at a certain electrode resistance heat and pressure generated by the current through the workpiece when the workpiece contacting surface between the two melting the welding connection method. Usually large current in order to prevent arcing contact surface and to forging weld metal during welding pressure to be applied consistently.
5, high productivity, and no noise and harmful gases, in mass production, and other manufacturing processes can be compiled together to the assembly line. However, due to flash butt welding sparks splash, requiring isolation.
3, the device power, high mechanization, automation, so that the higher cost of equipment, maintenance more difficult, and the commonly used high-power single-phase AC welder is not conducive to balanced operation of the grid.
Read more: SAW vs ERW and EFW Welded Steel Pipe
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