What is the correct bevel angle (± 2 1/2°) when beveling pipe?

The appropriate bevel angle for joining pipes via welding or other methods is commonly established based on the thickness of the pipe and the specific welding process being used. A bevel angle of 37.5 degrees is often recommended for achieving a good weld profile that allows for adequate penetration and fusion of the joint, especially when working with certain materials and thicknesses.

This angle provides a compromise between ensuring enough surface area for the weld without making the bevel too aggressive, which might weaken the joint. It allows for better access to the joint during the welding process, facilitates penetration, and helps to achieve a more effective weld bead.

Choosing the correct bevel angle is critical for maintaining joint integrity and strength, which is particularly important in high-pressure or critical applications. The ± 2 1/2° tolerance indicates that even slight variations within this range will be acceptable, making 37.5 degrees a versatile and commonly accepted standard in the industry.