Cangzhou Spiral Steel Pipe Factory: Introduction to Welding Repair Methods of Spiral Welded Pipes
Processing and welding of spiral welded pipes: Before welding, remove rust, oil, water, paint, etc., which are harmful to welding. Choose the electrode suitable for the steel grade. The spot welding time interval is shorter than that of carbon steel, so a spiral welding pipe brush should be used when removing welding slag. After welding, to prevent localized corrosion or loss of strength, the surface should be ground or cleaned.
With the increasing application of spiral welded pipes, the technical requirements and product diversification requirements of spiral steel pipes are getting higher and higher. The number of spiral welded pipe manufacturers in the market has also started to increase. Taken as a whole, it's not hard to find this type of plumbing to be very practical. Pipes were chosen because they are used in some important production areas. There are many issues to consider. Compared with ordinary pipes, spiral steel pipes are hollow. This is a hollow tube material. In the industrial field, it is not only used for mechanical production. At the same time, spiral steel pipe is also an important material for pipeline transportation. It can be seen that the utilization rate of spiral steel pipes in various fields is very high.
Cutting and punching: Spiral welded pipe is stronger than general materials, punching and shearing require higher pressure, and the gap between the tools is accurate, which will not cause shearing and work hardening. Plasma or laser cutting is preferably used. When gas cutting or arc cutting is required, the heat affected zone is ground and heat treatment is required.
Processing and bending of spiral welded pipe: the sheet can be bent 180 degrees, but in order to reduce the cracks on the curved surface, the radius is twice the thickness, the thickness radius of the thick plate is given twice along the rolling direction, and the bending direction is perpendicular to the rolling direction. A radius of 4 times the thickness of the plate shall be given, especially in the case of welding. To prevent machining cracks, the surface of the welded area should be ground.
The crack welding repair method of spiral welded pipe is a kind of stainless steel heat resistance. It has excellent oxidation resistance and corrosion resistance, and is often used in alkaline tubes for ion-exchange membrane electrolysis. However, due to the high technical requirements of materials, once the alloying elements and filler materials of the matrix are incomplete, the welding process is not suitable, the working conditions are not good, the medium corrosion in the pipeline, the working stress and pipeline cracks and other serious defects will lead to production. serious hazard. Therefore, crack repair is also a good repair method.