When welding pipes, the standard bevel angle is typically:
37.5 degrees per side, resulting in a 75-degree included angle between the two pipe ends.
This bevel is commonly used for:
Butt welds (pipe-to-pipe joints)
Standard pipe wall thicknesses
Manual and automated welding methods (TIG, MIG, Stick, etc.)
Here's a breakdown:
|
Bevel Type |
Angle per Side |
Total Included Angle |
Notes |
|
Standard V-Groove |
37.5° |
75° |
Most common for schedule 40/standard wall pipe |
|
Narrow Groove Bevel |
~20°–30° |
40°–60° |
Used for thick-wall pipe to reduce weld volume |
|
U-Groove / J-Groove |
Variable |
Custom |
Used for thick-wall/high-pressure applications to reduce weld metal needed |
Bevel Preparation Tips:
Ends are often prepared using pipe beveling machines, grinders, or lathes.
For manual prep, use a bevel gauge or bevel protractor to check accuracy.
Ensure a 1/16" (1.6 mm) root face (land) is left to prevent burn-through, unless a full penetration weld is required without backing.
Welding Code References
ASME B31.3 and ASME Section IX specify acceptable bevel angles.
Always follow project specs or WPS (Welding Procedure Specification) if provided.
