Erw pipe process mainly depends on a variety of products from raw materials to finished products, which need to go through a series of processes, completion of these processes requires a variety of machinery and equipment and welding, electrical controls, detection devices, these devices and devices according to different. The process requires a variety of reasonable arrangements, the typical flow of high frequency welded pipe: open-book – strip leveler – head and tail cut – strip butt – looper accumulator – molding – welding – clear the glitch – sizing – flaw -fly cut – Initial verification – tube Straightening – pipe processing – hydrostatic testing – flaw detection – Printing and coating – finished.

High-frequency welding is continuously flowing through the workpiece contact surface of the high-frequency current generated by the resistance heating and forging force to impose so that the workpiece metal to achieve a mutually successive welding method. It is similar to ordinary resistance welding, but there are many important differences.

High-frequency welding for carbon steel welded pipe production has been 40 years of history. High-frequency welding power of different material, diameter, and wall thickness of steel pipe to achieve a higher welding speed (more than l0 times higher than the TIG highest welding speed). Therefore, production of general-purpose high-frequency welding steel pipe has higher productivity of high-speed high-frequency welding, a pipe within the burr removal difficult, and this is also the high-frequency welded steel pipe is not yet for the chemical, nuclear industry accepted one of the reasons. From the welding material, high-frequency welding can weld all types of steel pipes. At the same time, the development of new steel grades and shaping the progress of welding methods.