Preparing a Pipe for Welding

When it comes to preparing a pipe for welding, achieving a quality weld hinges on meticulous pipe bevelling. A bevel end, created with a bevelling machine, is essential for a clean weld. There are various types of bevelled ends for butt joints.

What is a Bevel end?

A bevel is an angle formed at the edge of a pipe with a bevelling machine. The reason behind a bevel is to help prepare the pipe for a clean weld. There are a few common bevelled ends for butt joints. These are known as:

• I—type
• Single—V
• Double—V
• Single-U


I—type, commonly known as square, is the simplest of the joint methods and is for pipes of 1 to 6mm in thickness, any thicker and this method isn’t recommended for use. Technically, this method isn’t a bevelled end joint. This is because it only requires parallel matching of the edges.


A single—V is the most commonly used butt joint type in pipeline applications. Best suited for pipes between 3 and 26mm thickness, this butt joint type is the more costly option and requires more filler metal than the previous type but the finished joint is much stronger.


A double-V, also known as an X-bevelled end, is best suited for thicker pipes that range between 12 to 60mm. This joint type requires double-side welding which means the material needs to be turned over.


A single-U is a one-side welding joint and doesn’t need as much filler material as a double-V. In comparison to other types, single-U is much more complex to process due to its radian shape. It is also much less subjective.

Choosing the right bevelling machine is crucial. At PCES, we offer a comprehensive selection, including the popular Sawyer Band type Crawler and Mathey Dearman MagnaCut. Ensure optimal pipe prepping for superior pipeline welding by visiting us for top-notch pipe bevelling machines tailored to various pipe diameters, including large diameters. Our machines guarantee precise weld prep, enhancing the overall welding preparation process. For pipe bevelling machines, visit here