The main difference between ERW (straight seam resistance welded) steel pipes and HFW (high frequency welded) steel pipes is their different principles.
As the name suggests, resistance welding is a method in which pressure is applied through electrodes after the welding parts are assembled, and the resistance heat generated by current passing through the contact surface of the joint and adjacent areas is used for welding. High-frequency welding: When high-frequency current passes through a metal conductor, two peculiar effects will be produced: skin effect and proximity effect. High-frequency welding uses these two effects to weld steel pipes. These two effects are used to achieve metal The basics of high-frequency welding.
High-frequency welding uses the skin effect to concentrate the energy of high-frequency current on the surface of the workpiece; and uses the proximity effect to control the position and range of the high-frequency current flow path. The speed of the current is very fast, and it can heat and melt the edges of adjacent steel plates in a short period, and achieve docking through extrusion. Each has its advantages and disadvantages. Generally, specific choices need to be made based on a specific analysis of specific circumstances.
Post time: Apr-01-2024