Process Principle of Electric Resistance Welded Pipe

Electric resistance welded pipe (ERW steel pipe) is a method of welding current by combining the weld joint and applying pressure through the electrode, and through the resistance generated by the contact surface between the joint and the adjacent area. When the high frequency current passes through the metal conductor, two strange effects will occur: skin effect and proximity effect. High frequency welding is to use these two effects to weld the steel pipe, which are the basis of realizing high frequency welding. Metal. High frequency welding uses skin effect to concentrate the energy of high frequency current on the workpiece surface; proximity effect is used to control the position and range of high frequency current flow path. The speed of the current is very fast, it can heat, melt and join the adjacent steel plate edge in a short time.
      
Geometric seamless is to eliminate the internal and external burr of ERW steel pipe. Because of the structure of deburring system and the continuous improvement and improvement of cutting tools, the deburring of large and medium diameter steel pipes has been well handled. The internal burr can be controlled from about - 0.2mm to about 0.5mm.
The physical jointless means that there is a difference between the metal structure and the base metal inside the weld, which leads to the decrease of the mechanical properties of the weld area, and measures need to be taken to make it uniform