Tee shaped tube is larger than the diameter of the three-way, three-way crushed to a diameter about the size of the branch pipe portion in the drawing to open a hole; heated tube, into a forming die, and in the tube interior into the stretch manifold die; tube is radially compressed under pressure, the metal flow and form a manifold die under tension to the branch pipes in the radial direction of the compression process. The whole process is by radial compression and stretching process tube branch pipe portion is shaped. Hydraulic bulging tee is different, tee manifold metal tube is carried out by the radial movement of the compensation, it is also called radial compensation process. With heating due to repression tee, material forming equipment needed to reduce tonnage. Hot links wide adaptability of the material is suitable for low-carbon steel, alloy steel, stainless steel material; especially large diameter and wall thickness bias tee, usually using this forming process.