Types of Pipe Welding & Fittings

DataTime:[2016-5-15]

Pipe welding is performed to join two metal parts of a pipe, like the pipe itself and the fitting, together to prevent leakage. The fitting is a part that comes in various sizes and designs, and it is specifically used to join two or more pipes together. The fitting may also be used to make bends in the pipe line where necessary.

• Plug Fittings

The plug fitting is used to cap off an end of pipe that would otherwise spill out the material held by the pipe. The plug is placed on the pipe with a socket wrench, which is dependent on the type of fastening hole on top of the plug used. Of the numerous designs, there are hexagon head plug, square head plug, round head plug.

• Pipe Union

Pipe union fittings are meant to screw onto, and seal, a pipe without requiring a weld. Unionsmay be male to male, female to male or female to female. With a female end, the outside of the fitting is smooth, while threads line the inside. The male end would be the opposite, with threads on the outside.

• Pipe Elbows

An elbow is a short pipe piece at a 90° angle. The elbow is used to create a turn in the pipes, where an obstruction is able to be moved. The elbow comes in a variety of sizes, including one end being larger than the other to gradually reduce the pipe diameter overall.

• Pipe Tees

A tee is used to join together three separate pipes. The part looks just like a T, with two ends set in a horizontal fashion and the third end directly in the center, running vertical.

• Pipe Welding

Aside from the threaded fittings available, there are many types of connections that require welding two smooth surfaces together, like most elbows or tees. The procedure cannot take place until the area is entirely clean. There cannot be dripping water or other material in the pipe while it is being welded. The metal is typically preheated to soften the ends of the pipe and fitting, then the fitting is set into place. Once the piece is in place, the final weld is made. The binding metal, with a melting point of higher than 450° Celsius but less than the melting point of the pipe metal, is held over the fitting and heated until it melts into the cracks. Once the weld is secure, the pipes are checked for leaks, then welded once more if needed.

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