1. The principle and process of high-frequency welding
The high-frequency welding process is based on the principle of electromagnetic induction, as well as the skin effect, eddy heat flow effect and proximity effect of AC charge in the conductor. The edge steel of the weld is heated until it is heated to a molten state, and then the roller extrusion process is used to make the butt weld achieve intercrystalline bonding, so that the purpose of weld welding can be achieved.
2. Characteristics and advantages of high-frequency welding
High-frequency welding is a kind of induction welding, which we can also call pressure-based welding. High-frequency welding does not require filler materials for the weld, and there is no welding spatter during welding. The area affected by welding heat during welding is narrow, the shape after welding is very beautiful, and the mechanical properties of welding are very good. Due to these advantages of high-frequency welding, high-frequency welded pipes are widely used in the production of steel pipes.
3. Application and process of high-frequency welding
The high-frequency welding of steel pipes uses the skin effect and proximity effect of AC. After rolling, the steel forms a circular tube blank with a broken cross section. One or a group of resistors rotate near the center of the induction coil inside the tube, and an electromagnetic induction loop is formed between the resistor and the tube opening. Under the action of skin effect and proximity effect, a strong and concentrated thermal effect is generated at the edge of the tube opening, which quickly heats the weld edge to the required welding temperature. After being squeezed by the rollers, the molten metal achieves intercrystalline bonding and forms a firm butt weld after cooling.
