Welded tees are generally categorized into equal-diameter tees, reducing tees, and materials include carbon steel, alloy steel, and stainless steel.

Welded tees consist of a main pipe section with a smaller branch pipe attached. Clearly, the two larger sizes are the main pipes, while the smaller size in the middle is the branch. In pure oxygen pipelines, they are typically under pressure, making oxygen more reactive. When using a welded tee, if debris moves within the pipe with the oxygen flow and, due to the change in pipe diameter, the flow velocity alters, it may cause debris to collide with the pipe, creating a fire source, or static discharge due to the change in velocity, which could lead to the ignition of the pure oxygen pipeline.

Welded tees are widely used in industrial pipelines for industries such as oil, aerospace, chemical, metallurgy, power, military, and engineering accessories. In terms of production technology, there are two types: seamless cold drawn tees and welded tees.