Bevel angle vs groove angle: meaning and how to check it
The bevel angle is the angle cut on one member's edge, measured from a line square to that member's surface. The groove angle is the total angle of the opening between the two members. On a single-bevel joint the two are equal. On a symmetric single-V, the groove angle is twice the bevel angle.
Use this diagram
How to measure each angle
- Ask what's being measured. One member's edge? That's a bevel angle. The space between both members? That's the groove angle.
- Find the reference line. A bevel angle is measured from a line at right angles to the plate surface, not from the plate surface itself. Measuring from the surface gives you the complement and a wrong reading.
- Add up the sides. A single-V with two equal bevels has a groove angle of twice either bevel. A single-V with unequal bevels has a groove angle equal to the sum of the two.
- Check with a protractor or bevel gauge. Set one arm on the plate surface or square to it, read the bevel, and repeat on the other member if it's beveled too.
- Read the symbol. On a groove weld symbol, the angle written outside the open end of the groove mark is the groove angle.
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Definitions and Terminology
A fatigue crack in a cyclically loaded fillet-welded attachment started along the line where the surface of the weld blends into the flange plate. At which weld feature did the crack start?
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Common mix-ups
- Single-bevel versus single-V. On a single-bevel joint only one member is cut, so groove angle and bevel angle are the same number. On a V, they aren't.
- Bevel angle versus bevel. "Bevel" also names the cut edge itself and the joint type. The angle is just one dimension of it.
- The symbol shows groove angle. Candidates often read the number on a V-groove symbol as the bevel. It's the included angle of the whole groove.
- J and U preps. These use a bevel radius as well as an angle, and the radius usually comes from a joint detail rather than the symbol.
- Below the bevel. The flat strip under the bevel is the root face, and the gap between members is the root opening. Neither is an angle.
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Bevel and groove angles on the CWI exam
Both terms are in Definitions and Terminology, at least 12% of the closed-book Part A, and the groove angle on a symbol is part of Symbols, Welding and NDE, at least 10% of Part A.
The Part B tool kit includes a protractor, and reading angles off joint details is part of Utilization of Specifications and Drawings, at least 8% of the practical.
On a D1.1 Part C, groove angles appear in the prequalified joint details in Clause 5 and in fit-up in Clause 7. Read the dimensions and tolerances in your own copy; none are given here.
Practice it
The weld gauge reading trainer builds the gauge habits angle checks rely on: zero the tool, set it square, read the nearest mark. See the groove angle on a symbol in the V-groove weld symbol page, and the rest of the joint-prep terms in the welding terms glossary.
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Sources
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- AWS bookstore, terminology and symbols listing, American Welding Society. Retrieved 20 Oct 2026.
- CWI Part A Fundamentals Examination Information, American Welding Society, Rev. 03.01.2024. Retrieved 20 Oct 2026.
- AWS B5.1:2025, Specification for the Qualification of Welding Inspectors, American Welding Society, Tables 5.1 and 8.1. Retrieved 20 Oct 2026.
Facts checked 25 October 2026 against the sources listed above. If something has changed, tell us and we will correct it within 2 business days.
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