Weld Symbols Guide

Complete reference for AWS A2.4 weld symbols - learn to read welding blueprints

Search Weld Symbols

▭ Fillet Weld Triangle symbol. Most common weld.

V V-Groove Both sides beveled

˅ Bevel Groove One side beveled

U U-Groove Both sides U-shaped

J J-Groove One side J-shaped

|| Square Groove No bevel, square edges

▢ Plug Weld Filled hole in one member

▪ Slot Weld Elongated hole

● Spot Weld Resistance spot weld

○ Seam Weld Linear resistance weld

⌒ Flange Weld Edge flange

≈ Surfacing Weld Build-up or overlay

Placement	Meaning
Below the line	Weld on arrow side (where arrow points)
Above the line	Weld on other side (opposite of arrow)
Both sides	Weld on both sides of joint

Example: 1/4 on left of symbol means 1/4 inch weld size.

Arrow Side (Below Line) ↓ Weld here

Other Side (Above Line) ↑ Weld here

Both Sides ⇅ Weld both sides

Fillet weld, arrow side, 3/8" size = Symbol below line with 3/8 on left
V-groove, both sides, full penetration = V symbol on both sides with flag (weld all the way through)
Bevel groove, arrow side = Bevel symbol below line

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