Welding characteristics of stainless steel industrial welded pipe

Stainless steel industrial welded pipe welding characteristics
There are roughly two methods of welding stainless steel industrial welded pipes, namely: contact welding and induction welding. So what's special about the two different welding methods?
1. Contact welding

Contact welding uses a pair of copper electrodes in contact with both sides of the steel pipe to be welded. The induced current has good penetration. The two effects of high-frequency current are greatly utilized due to the direct contact between the copper electrodes and the steel plate. Therefore, the contact welding It has high efficiency and low power consumption, and is widely used in the production of high-speed and low-precision pipes. Contact welding is generally required when producing particularly thick stainless steel high-frequency welded pipes.

However, there are two disadvantages in stainless steel contact welding:
1. Due to the influence of the surface flatness and edge straightness of the stainless steel plate, the current stability of contact welding is poor, and the internal and external burrs of the weld are relatively high. Contact welding is generally not used when welding high-precision and thin-walled pipes.
2. The copper electrode is in contact with the steel plate and wears out quickly;
2. Induction welding
Induction welding is to wrap one or more turns of induction coils on the outside of the steel pipe to be welded. The effect of multi-turns is better than that of single turns, but it is more difficult to manufacture and install multi-turns induction coils. The efficiency is higher when the distance between the induction coil and the steel pipe surface is small, but it is easy to cause discharge between the induction coil and the pipe. Generally, it is advisable to keep a gap of 5-8 mm between the induction coil and the steel pipe surface. When using induction welding, since the induction coil is not in contact with the steel plate, there is no wear and tear, and the induction current is relatively stable, which ensures the stability of welding. The surface quality of the steel pipe during welding is good, and the weld seam is smooth. For precision pipes, induction welding is basically used.