High-frequency welding technology was invented in the early 1950s and rapidly applied to industrial production. It is a welding method that utilizes a high-frequency current of 10–500 kHz to generate resistance heat at the joint surface of the workpieces, achieving atomic bonding with or without pressure.
As a highly specialized welding method, high-frequency welding is mainly used in highly mechanized or automated pipe and profile production lines, with welding speeds reaching 30 meters per minute.
In recent years, high-frequency welding technology has become a new research hotspot in the field of joining and is developing rapidly. Its forming technology is also constantly evolving.
In roller forming technology, optimizing the inner roller dimensions improves stability; in FFX forming technology, using a larger V-shaped welding angle effectively prevents welding defects such as ash spots, thereby improving welding quality.