Bevel — What It Is and Why It Matters
A bevel is an angled cut on the edge of a plate or pipe that creates a groove when two beveled pieces are placed together for welding. Beveling is the most common form of joint preparation for groove welds on material too thick for a square butt joint to achieve full penetration.
Standard bevel angles range from 22.5° to 37.5° per side, creating included groove angles of 45° to 75° when two matching bevels form a V-groove. The angle, root face (the unbeveled land at the root), and root opening (the gap between the root faces) are specified by the WPS or engineering drawing and directly affect weld volume, access, and penetration.
Bevels are cut using oxy-fuel cutting (most common for carbon steel), plasma cutting (fast, clean edges), grinding (small joints, field work), and machining (precision applications, pipe ends). The bevel surface must be clean, smooth, and free of gouges or excessive roughness that could trap contamination or cause lack-of-fusion defects.
Frequently Asked Questions
What angle should I bevel?
The most common bevel angle for V-groove joints is 30° per side (60° included angle). Some codes specify 22.5° per side (45° included) to reduce weld volume on thick material. The WPS or engineering drawing should specify the required angle, root face, and root opening for the specific application.
What tools are used to bevel pipe?
Pipe beveling machines (clamshell-style or ID-mount) produce consistent, precise bevels on pipe ends. For field work, a portable pipe beveling machine or a hand grinder with a flap disc can prepare acceptable bevels. Oxy-fuel or plasma torch beveling is common for large-diameter pipe where machine access is limited.