The forming of a three-way joint is to flatten a pipe blank larger than the diameter of the three-way joint to the size of the three-way diameter, and open a hole at the part where the branch pipe is stretched; The pipe blank is heated and placed into the forming mold, and a die for stretching the branch pipe is inserted into the pipe blank; Under the action of pressure, the billet is radially compressed, and during the radial compression process, the metal flows towards the branch pipe direction and forms a branch pipe under the stretching of the die. The entire process is formed through the radial compression of the pipe blank and the stretching process of the branch pipe. Unlike hydraulic expansion tees, the metal of the tee joint branch pipe is compensated by the radial movement of the pipe blank, so it is also known as radial compensation process.

Due to the use of heated compression tees, the equipment tonnage required for material forming is reduced. Hot pressed tees have a wide adaptability to materials and are suitable for materials such as low carbon steel, alloy steel, and stainless steel; Especially for tees with large diameters and thick pipe walls, this forming process is usually used.