The manufacturing technique of tee mainly include two types: Hydraulic bulging and Hot pressure forming.
1. Hydraulic bulging is the process of injecting liquid into a pipe blank using a specialized hydraulic press. Two horizontal side cylinders of the hydraulic press move synchronously to compress the pipe blank, casing the volume of the pipe blank to decrease and the liquid pressure inside the pipe blank to increase. When the pressure required for the expansion of the three-way branch pipe is reached, the metal material flows along the mold cavity under the dual action of the side cylinder and the liquid pressure inside the pipe blank to expand the branch pipe. This type of manufacturing technique is suitable for low carbon steel, low alloy steel and stainless steel, etc.
2. Hot pressure forming is the process of heating and flattening a pipe blank larger than the diameter of a tee to the size of the tee diameter, and then opening holes at the branch pipe to heat the pipe blank. During the radial compression process, the metal flows towards the direction of the branch pipe and forms the branch pipe under the stretching of the mold. This type of manufacturing technique is suitable for large diameter tee.
