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The Weld
Symbol Chart.

Every AWS A2.4 symbol, explained in plain terms - fillet, groove, plug, slot, spot, seam, and the supplementary marks that change what they mean. Scroll down to look one up, or carry the full interactive version on the shop floor.

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Symbol Anatomy
1/4 4-6 N3
Arrow side ▸ below the line
Far side ▸ above the line
Left of symbol ▸ size
Right of symbol ▸ length
The Chart

Look up a symbol.

Filter by weld type to jump to a category, or scroll the whole chart. Every symbol below is drawn to AWS A2.4 proportions.

Fillet
Corner / T-joint
Square Groove
Butt joint
V-Groove
Butt joint
Bevel Groove
Butt joint, one side prepped
U-Groove
Rounded base, both sides
J-Groove
Rounded base, one side
Flare-V Groove
Curved surfaces
Flare-Bevel Groove
Curved + flat surface
Plug / Slot
Fills a hole or slot
Spot
Resistance / projection
Seam
Continuous resistance weld
Back / Backing
Reinforces the root pass
All-Around
Weld goes all the way around
Field Weld
Done on-site, not in shop
Convex Contour
Finish ground/built up
Concave Contour
Finish ground/built up
Quick Reference

How to read it.

1

Find the reference line

It's the horizontal line every symbol attaches to. The arrow at one end points to the actual joint on the part.

2

Check above or below the line

A symbol sitting below the line means weld the arrow (near) side. A symbol sitting above means weld the far side. Symbols on both sides mean weld both.

3

Read size, then length

Size - leg length, depth, or diameter - sits to the left of the symbol. Length sits to the right. No length given means the weld runs the full joint.

4

Look for the tail

A forked tail at the end of the reference line calls out a welding process, code, or note - like "GMAW" or a reference to a specific AWS D1.1 clause.

In the App

The full interactive
symbol reference.

This page covers the basics. The app has the complete AWS A2.4 set - drawn as SVG, not flat images - with anatomy breakdowns and worked examples you can study before a cert test.

Every fillet, groove, plug, slot, spot, seam, and supplementary symbol
4 fully worked examples with dimension breakdowns
Works offline - no signal needed on the shop floor
Google Play App Store
FAQ

Common questions.

The reference line is the horizontal backbone of every weld symbol. Symbols placed below it apply to the near (arrow) side of the joint. Symbols placed above it apply to the far (other) side.
A fillet weld symbol is a right triangle attached to the reference line, used for corner and T-joints. Groove symbols vary by joint prep - square, V, bevel, U, J, flare-V, and flare-bevel - and are used for butt joints where the base metal edges are shaped before welding.
Size is shown to the left of the symbol (weld leg size or depth), and length is shown to the right (the length of the weld along the joint). If no length is given, the weld runs the full length of the joint.
Yes. Every symbol on this page and in the app follows AWS A2.4 standard symbols for welding, brazing, and nondestructive examination.