The straight seam welded pipe production line is a pipe production line integrating pipe welding, finishing, pipe processing, and heat treatment of pipe sleeves.
ERW steel pipe production line introduces the molding equipment and technology developed by Germany's SMS group, and is equipped with the world's most advanced non-destructive testing equipment, high-frequency welding equipment, welding equipment and heat treatment.
The welding of formed steel pipes is the core component of the welded pipe production line, and the quality of the welding directly determines the qualification rate of the product. With the continuous development of power components and power electronics, as well as the promotion of heating, melting, and welding equipment, inductive welding equipment technology has also received unprecedented opportunities for development. From the power element to the thyristor, the MOSFET is gradually applied to the IGBT, and the power and frequency of the sensing device are gradually increased.
ERW welded pipe unit has absorbed the development experience of similar units in the world, combined with the development of advanced high-frequency induction technology in the world, using EFD's high-power induction welding technology based on IGBT. The device can be used as induction welding machine, but also can replace the load for the contact welding machine. Contact welding has the advantages of high efficiency and low power consumption, but has the disadvantage of easily leaving contact block scratches and EDM burn marks. Therefore, in view of the continuous improvement of the quality requirements of users, high-frequency induction welding has been applied in the 20th century for 90 years.
The basic principle of contact welding is the same as induction welding. The difference is that the induction welding requires the coils to be arranged on the shaped steel tube, and the contact welding presses the two edges of the steel sheet tightly through the contact pieces. Inductive welding current refers to the current induced by the high frequency current through the coil, while the contact welding current directly uses the high frequency supply current. Therefore, the contact welding efficiency is significantly higher than that of induction welding, but contact scratches and spark burn marks are also easily generated.
