ERW steel pipe production process needs a series of processes from raw materials to finished products. In order to complete these processes, a variety of mechanical equipment and welding, electrical control and testing equipment are needed. These devices and devices have a variety of reasonable layout according to different process requirements. Typical process of EWR steel pipe: unwinding-stripping leveling-head and tail shearing-strip butt welding-looper storage-forming-welding-deburring-sizing-flaw detection-flying-cutting-initial inspection-steel pipe straightening-pipe section processing-hydraulic testing-flaw detection-printing and coating-finished products.


High frequency welding is a kind of welding method, in which the resistance of high frequency current flowing through the continuous contact surface of workpiece is heated by resistance, and the forging force is applied to realize the interconnection between workpiece metals. It is similar to ordinary resistance welding, but there are many important differences.


High frequency welding has been used in the production of carbon steel welded pipe for more than 40 years. High frequency welding has a large power supply, and for different materials, steel pipe with diameter and wall thickness (10 times higher than the maximum welding speed of argon arc welding) can achieve higher welding speed. Therefore, high frequency welding produces high productivity general purpose steel pipes, because of the high speed of high frequency welding, which makes it difficult to remove burrs in welded pipes. This is why HF welded steel pipes are still not accepted by the chemical and nuclear industries. One. From the point of view of welding materials, high frequency welding can weld various types of steel pipes.