Two Ways To Weld High-frequency Straight Seam Welded Pipe

High-frequency straight seam welded pipes are also called erw steel pipe. There are two ways to weld the 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.

However, there are two disadvantages in contact welding: one is that the copper electrode is in contact with the steel plate, and the wear is fast; the second is 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 higher. It is generally not used when welding high precision and thin walled tubes.

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 precautions: Generally speaking, 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. Also pay attention to the handle in the direction of the outlet pipe to avoid operation. Improper impact on your 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.

A worker from a steel pipe company, which is located in China.