Pipe Bevel Types for Welding: V, Y, X and K Explained
The four bevels at a glance
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| Bevel | What it looks like | Typical use | Can plasma cut it? |
|---|---|---|---|
| V | One side bevelled, no land | Butt joints in thin and medium wall | Yes |
| Y | V bevel with a flat root face (land) | Most pipe butt welds; the land controls burn-through at the root | Yes |
| X | Double V, bevelled from both sides | Thick wall, welded from inside and outside | Yes, on large pipe |
| K | Double bevel on one member | T-joints and branch connections in thick wall | Yes |
| J and U | Curved root profile | Very thick wall, to reduce weld metal | Usually machined |
Angles and land: a common starting point
For butt welding pipe, the widely used bevel in ASME B16.25 is 37.5° (±2.5°) with a 1.6 mm (±0.8 mm) land for wall thickness up to about 22 mm. Thicker walls often use a compound bevel that changes to a shallower angle further from the root, to save weld metal. Structural joints often use 30° to 45°. These are starting points: the bevel angle, land and root gap must follow the welding procedure specification (WPS) for your job.
Why bevels on branches and saddles are hard
On a straight pipe end, the bevel angle is the same all the way round. Where a branch pipe meets a header, the angle between the two surfaces changes continuously round the joint. A hand-held torch or a simple pipe cutter cuts one angle everywhere, so part of the joint is too open and part too closed, and the welder spends hours grinding. A 5-axis machine tilts and swings the torch as the pipe turns, so the bevel follows the joint.
Ways to prepare pipe bevels
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| Method | Good for | Limits |
|---|---|---|
| Hand torch and grinder | Occasional repairs | Slow, inconsistent, heavy grinding |
| Bevelling machine (lathe-type) | Straight pipe ends, J and U bevels | Cannot cut saddles or branch holes |
| Orbital oxy-fuel cutter | Straight cuts and simple bevels on site | Manual setup for each angle, carbon steel only |
| CNC plasma, 5-axis | Saddles, branch holes, V/Y/K/X bevels in one setup | Plasma edge; very high-spec joints may need light machining |
What to check on a cut bevel
- Bevel angle against the WPS, measured at several points round the pipe
- Land (root face) thickness and consistency
- Dross or slag on the inside of the pipe
- Fit-up gap when the two parts are brought together
Machines for pipe bevels
Our 5-axis pipe cutting and beveling machine covers 2–24 in pipe in 20 or 40 ft lengths. For Ø600–2000 mm heavy-wall pipe up to 10 t, see the large pipe profile cutting machine. For structural sections with pipe, see the 8-axis all-in-one machine.
Ask an engineer
Send a drawing of your pipe joint and the wall thickness, and we will check which machine and bevel setup fits.