1, manually set out or set out on AUTOCAD, do a good job of wall thickness treatment, and then make a good sample with linoleum paper or asbestos board;

2. With the template of branch pipe, draw lines on the steel pipe and cut it for later use;

3. Clamp the branch pipe (saddle-shaped) at the place to be opened, and draw a line along the edge of the saddle-shaped opening with a pencil;

4. If the fillet weld of one-sided groove is welded, cut the hole directly according to the drawn line, and pay attention to the grasp of the "front line" angle of gas cutting; If it is fillet welding, subtract the wall thickness, draw a cutting reference line evenly in the drawn line, and cut the hole.

tee

Hydraulic bulging process can be formed at one time with high production efficiency; The wall thickness of the main pipe and the tee shoulder is increased. Because the hydraulic bulging process of seamless tee requires large tonnage equipment, it is mainly used to manufacture standard tee with wall thickness less than DN400 in China. Its suitable forming materials are low carbon steel, low alloy steel and stainless steel with relatively low cold working hardening tendency, including some non-ferrous materials, such as copper, aluminum and titanium.