High-frequency welding is a type of welding method that uses resistance heat generated by high-frequency currents flowing through the continuous contact surface of the workpiece to achieve mutual connection between the workpieces when the upsetting force is applied. This welding method is similar to ordinary resistance welding, but there are many important differences.

The high-quality high-frequency pipe mill welding machine has a large power supply, and can reach a higher welding speed for steel pipes of different materials, diameters and wall thicknesses (more than 10 times higher than the maximum welding speed of argon arc welding). Therefore, the high-frequency welding production of general-purpose steel pipes has a higher productivity. Because the high-frequency welding speed is high, it is difficult to remove the burrs in the welded pipe. This is also the reason why high-frequency welded steel pipes are not accepted by the chemical and nuclear industries. one. In terms of welding material, high frequency welding can weld various types of steel pipes.

1. The influence of raw materials on the welding quality of steel pipes. The main factors affecting the quality of raw materials are the unstable mechanical properties of the steel strip, the surface defects of the steel strip and the large deviation of geometric dimensions.

2. In the production process of high-frequency welded pipes, how to ensure that the product quality meets the requirements of technical standards and customer needs, it is necessary to analyze the factors that affect product quality during the production of steel pipes. Therefore, in the production process of steel pipes, the three links of raw materials, welding technology and roll adjustment should be mainly controlled.

3. The influence of high frequency welding on the quality of steel pipes. In the process of high-frequency welding of steel pipes, the control of the welding process and process parameters, the placement of the induction coil and the impedance device, etc. have a great influence on the welding quality of the steel pipe weld.

4. The influence of roll adjustment on steel pipe quality. It can be seen from the steel pipe waste analysis graph that the roll adjustment is a steel pipe operation process. In the production process, when the rolls are damaged or worn severely, some rolls need to be replaced on the unit, or a certain variety is continuously produced in sufficient quantities, and the entire set of rolls needs to be replaced. At this time, the rolls should be adjusted to obtain good steel pipe quality. If the roll is not adjusted properly, it is easy to cause the torsion, lap welding, edge waves, bulging and indentation or scratches on the surface of the pipe body, and large ovality of the steel pipe. Therefore, the roll adjustment should be mastered when changing the roll. skill.