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Flare-bevel groove weld symbol: what it means on a drawing

Fillet Gauge editorial teamSources checked 4 min read

The flare-bevel groove weld symbol is an upright stroke with one curve beside it on the reference line. It calls for a groove weld in the narrow valley where a rounded surface meets a flat one, such as a round bar or radiused tube corner lying on a plate, or a bent sheet flange against a flat sheet.

A round bar lying on a flat plate, drawn end on, with weld metal in the valley between the bar's curve and the plate, beside a flare-bevel symbol with 1/8 in parentheses on its left
One upright stroke for the flat member, one curve for the round one. Numbers are invented.
Use this diagram

How to read it

  1. Find the side. Below the line, the weld goes in the flare on the arrow side. Above the line, the other side. A flare-bevel on both sides of the line asks for welds in the flares on both faces, such as both sides of a bar lying on a plate.
  2. Read the left side. As on the flare-V, a plain number is the groove depth and a number in parentheses is the weld size. A lone number in parentheses, like (1/8), gives only the weld size.
  3. Read the right side. A number on the right is the weld length. Length and pitch, such as 2-6, make it intermittent the same way they do on a fillet.
  4. Read the tail. A process or a note goes there.

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Symbols - Welding and NDE

On a welding symbol, what does a circle at the junction of the arrow and the reference line indicate?

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The upright stroke is the flat member

Think of the mark as a picture of the joint: the upright stroke stands for the flat face and the curve for the rounded one. The upright stroke is always drawn on the left, whatever the joint looks like, the same rule as the fillet, bevel and J marks. Read which member is round from the drawing itself, not from the way the mark faces.

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Where you see flare-bevel welds

Tube-to-plate connections where the tube's radiused corner sits on a base plate, round bar laid on plate as a stiffener or rail, and formed sheet where a bent flange meets a flat panel. On thin sheet, the flange can supply much of the metal, so the weld may need little filler.

Common mix-ups

  • Flare-bevel or bevel. The bevel groove mark has a straight sloping stroke, and the groove is cut. The flare-bevel has a curve, and the groove comes from the member's round shape.
  • Flare-bevel or flare-V. One curve means one rounded member. Two curves facing each other is a flare-V, with both members rounded.
  • Flare-bevel or J. A J's curve grows out of its upright stroke. The flare-bevel's curve stands apart from the stroke and bulges toward it.
  • Flare-bevel or fillet. A bar on a plate can look like a fillet joint. If the drawing shows the flare mark, the size is a groove weld size, not a fillet leg.

Flare-bevels on the CWI exam

Flare marks are part of Symbols, Welding and NDE, at least 10% of CWI Part A, so you have to know them without a reference in front of you. Part B drawings are read under Utilization of Specifications and Drawings, at least 8% of the practical, and tube-to-plate details are a natural place for a flare-bevel.

Practice it

The welding symbols quiz drills the bevel and J marks that the flare-bevel is most often confused with. See the flare marks next to every other groove on the welding symbols chart.

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Facts checked 24 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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