How is welded pipe made?

　　Structural metal pipes are key components in many metal manufacturing projects and applications. Metal tubes are commonly used because they provide a perfect combination of strength and low weight, and are affordable compared to solid metal inventory. There are two main types available: welded pipes and seamless pipes. This article will provide a deeper understanding of the manufacturing methods of welded pipes.

　　What is welded pipe?

　　Welded pipe is a structural metal pipe with welds along its longitudinal axis. It can basically be made of any type of metal or weldable metal alloy, such as carbon steel, stainless steel, low alloy steel, and aluminum. Welded metal pipes typically have the following shapes:

　　circular

　　square

　　Rectangular

　　How is welded pipe manufactured?

　　The large-scale manufacturing of welded pipes is a complex process that involves multiple steps.

　　Firstly, use a thickness that matches the thickness of the finished pipe wall to select the metal coil. The coil must also be wide enough to achieve the required circumference and diameter.

　　The coil is fed and formed through a series of molds. This causes the two edges of the coil width to approach each other until one edge contacts the other edge of the tube.

　　The welding process is used to connect these two edges together.

　　According to the manufacturing process of welded pipes, excess weld reinforcement materials may be removed at this time. Newly formed pipes can also undergo heat treatment according to the required specifications.

　　Then cut the pipe into the required length.

　　What type of weld seam is used to make welded pipes?

　　Resistance welding

　　High-frequency welding

　　Laser beam welding

　　Tungsten gas shielded arc welding (argon arc welding)

　　Plasma arc welding

　　Submerged arc welding