Welding Method Of High-frequency Straight Seam ERW Pipe Unit

There are two main methods for welding high-frequency straight seam erw steel pipe units: contact welding and induction welding.

Contact welding is a pair of copper electrodes in contact with both sides of the welded steel pipe, the induction current penetration is good, the two effects of high-frequency current are maximized by the direct contact between the copper electrode and the steel plate, so the welding efficiency of the contact welding higher and lower power consumption, it is widely used in high-speed and low-precision pipe production, and contact welding is generally required in the production of particularly thick steel pipes.

But there are two disadvantages to contact welding:First, the copper electrode is in contact with the steel plate and wears quickly;Second, due to the influence of the flatness of the surface of the steel plate and the straightness of the edge, the current stability of the contact welding is poor, and the internal and external burrs of the weld are high, which are generally not used when welding high-precision and thin-walled pipes.

Induction welding is performed by one or more turns of induction coils on the welded steel pipe. The effect of multi-turn is better than that of single-turn, but it is more difficult to make and install multi-turn induction coils.

When the distance between the induction coil and the surface of the steel pipe is low, the efficiency is high, but it is easy to cause the discharge between the induction coil and the pipe. Generally, it is preferable to keep the induction ring from 5 to 8 mm from the surface of the steel pipe.

When induction welding is used, since the induction coil is not in contact with the steel plate, there is no wear, and the induced current is relatively stable, which ensures the stability during welding. The surface quality of the steel pipe during welding is good, the weld seam is flat, and the production is as high as API. In the case of precision pipes, basically the form of induction welding is used.

Welding pipe unit commissioning and routine maintenance precautionsIn general, the development of the welded pipe unit must comply with the safe operating procedures, the operator must not be in contact with the mold during the operation of the unit, but also pay attention to the handle in the direction of the outlet tube, to avoid the impact of improper operation on their health and safety..

In addition, the operator of the welded pipe unit should pay attention to check whether the lubrication points of the unit are lubricated before operation. Otherwise, it is necessary to add some lubricating oil to ensure the normal operation and work of the unit.

During the use of the welded pipe unit, it is necessary to pay attention to the use of some high-temperature resistant synthetic composite aluminum-based grease, so as to avoid damage to the welded pipe unit.