High frequency welding is the main part in the quality control of welded pipe production. It uses the skin effect and proximity effect of high-frequency current, so that the end of the steel plate melts in a very short time. After extrusion, the oxide layer and impurities on the strip surface are extruded, and the substrate is integrated.

In GEI-219 ERW pipe making machine, it’s normally equipped with 600KW solid state HF. It will automatically track and adjust the frequency according to steel strips thickness and unit working speed when do the welding.