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Briefly describe the manufacturing process of high frequency straight seam steel pipe

The high frequency straight seam steel pipe(eg:ERW steel pipe) is based on the principle of electromagnetic induction and the skin effect, proximity effect and eddy current heating effect of the AC charge in the conductor, so that the steel at the edge of the weld is locally heated to a molten state, and the butt weld is realized by the extrusion of the roller Intercrystalline bonding, so as to achieve the purpose of welding seam welding.



High-frequency welding is a kind of induction welding (or pressure contact welding). It does not require weld fillers, no welding spatter, narrow welding heat-affected zone, beautiful welding shape, good welding mechanical performance and other advantages. Therefore, it is very popular in the production of steel pipes. Wide range of applications.

The high-frequency welding of steel pipes uses the skin effect and proximity effect of alternating current. After the steel (strip) is rolled and formed, a circular tube blank with a broken section is formed, which is rotated around the middle of the induction coil in the tube blank. Or a set of resistors (magnetic rods), which form an electromagnetic induction loop with the opening of the tube blank. Under the action of the skin effect and the proximity effect, the edge of the opening of the tube blank generates a strong and concentrated heat effect, which makes the weld edge After being quickly heated to the temperature required for welding and squeezed by the pressure roller, the molten metal realizes intergranular bonding, and after cooling, a firm butt weld is formed.
 

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