Frequency straight seam welded pipe induction system has a high production speed, the welding process is stable, good quality, which has been widely used in pipe production. The actual production of many factors affecting the quality of the weld, in order to get a good welding effect, you must strip width, molding process, weld orientation, squeeze rollers, induction coil, the impedance control and other factors. In order to obtain a satisfactory welding results, the strip size to be as accurate as possible, in order to meet the standard requirements, the general thickness of allowable tolerances. Even if some strip width changes can also lead to poor welding. Some advocates ideal welding conditions, only a sufficient load force for the strip edges are pressed together continuous welding, so that the entire cross section of the strip only a small surface depression. This view is not correct.
Although the precise slitting strip welding process to meet the requirements of the strip width, but the unit, section of rough shaping and forming machine itself caused by the dynamic changes may alter the welding point of the strip width, for example, with each a roll diameter of the drive radius decreases, the welding point is possible to reduce the width of the strip. As the roll from the stress applied to the tube forming unit of the transmission device, thus reducing the amount of the width of the strip should be based on the stress applied to the roll, the strip strength and thickness. If thicker strip, it allows the clamping roll and apply sufficient stress. Again, the roll gap when the unit has been adjusted to the minimum value of the strip thickness range, and the strip has a maximum thickness to allow molding into the thick sections, it may cause the strip of reduced thickness, width increases. Increasing the value of the strip width of the strip strength, thickness, roll diameter and the distance between the two support bearings on. Therefore, high-frequency welded pipe mounting accuracy is very important.
Therefore, if the quality of welding pipe production fluctuations or difficult to obtain ideal welding state, need to check the side edges of the strip width and angular wings curved case. Even with little change in quality and size to produce high quality steel pipe, which can not be too extruded strip. That is, the pipe outer surface of the heat-affected zone width, the induction coil controlling the position and size of the inner surface of the heat affected zone width is determined by the position and size of the impedance control. If the induction coil and the impedance of the device are removed welding points, then widens the heat-affected zone after welding has a large surface depressions and easily deformed, while the large amount of metal being squeezed out, resulting in power consumption increases.
