Schweißsymboltabelle PDF — AWS A2.4 Druckbar

Q: Is there a free weld symbol chart PDF?

Yes. Click Print / Save PDF on this page or use your browser's print function. No registration required.

Q: What standard do weld symbol charts follow?

In North America, weld symbols follow AWS A2.4 (currently A2.4:2020). In Europe and internationally, ISO 2553:2019 applies. The two are similar but differ in arrow-side/other-side conventions. Most drawings in the US, Canada, and the Middle East use AWS A2.4. Australia uses AS 1101.3 (aligned with ISO). Always check the drawing title block — it should state which standard governs.

Q: How do I read the size dimensions on a weld symbol?

For fillet welds: the number to the left of the triangle symbol is the leg size. For groove welds: the groove depth (D) appears without parentheses, and the weld size/effective throat (S) appears in parentheses — written as D(S) per A2.4. Numbers on intermittent welds to the right of the symbol read as length–pitch (e.g. 50-150 means 50mm long welds on a 150mm center-to-center pitch).

Q: What do the letters at the tail of a weld symbol mean?

The tail (the forked end of the reference line) contains a specification, process code, or reference. Common examples: a welding process (SMAW, FCAW, GTAW), a WPS number (WPS-001), or a drawing note reference (SEE DWG A-3). If no tail information is needed, the tail is omitted entirely. Per A2.4, the tail is used only when additional information is required that cannot otherwise be shown on the symbol.

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Section 1Symbol Anatomy

Reference Line Horizontal baseline — all symbol elements attach to it. Arrow side = below, other side = above.

Arrow Points to the joint location. For bevel/J-groove, a break in the arrow indicates the prepared member.

Weld Symbol Graphic indicating weld type (triangle = fillet, V = groove, etc.). Placed below or above the line.

Dimensions Size to the left of the weld symbol. Length and pitch to the right. Depth/throat in parentheses.

Tail Forked end — contains process (SMAW, FCAW), WPS number, or specification reference. Omit if unused.

Weld-All-Around Circle at reference/arrow junction — weld must continue completely around the joint.

Field Weld Flag Filled triangle at reference/arrow junction — weld to be made in the field, not in the shop.

Contour Symbol Same side as the weld symbol, on its outer face — flush, flat, convex (outward arc), or concave (inward arc) — A2.4 lists flush and flat as distinct contour types. Arrow side = below reference line; other side = above. Paired with finishing letter.

Section 2Weld Symbol Reference

Weld Type	Size Notation	Common Applications
Fillet	Leg size left of symbol (e.g. `6` for 6mm)	T-joints, lap joints, corner joints — most common weld type
Square Groove	`D(S)` — groove depth D, weld size (S) in parens	Butt joints, full/partial penetration
V-Groove	`D(S)` — groove depth D, weld size (S) in parens	Butt joints, full/partial penetration
Bevel Groove	Arrow break indicates prepared member	One-sided prep butt joints, T-joints with PJP
U-Groove	Groove depth and weld size as `D(S)`	Thick section butt joints — reduces weld volume vs V
J-Groove	Arrow break indicates prepared member	One-sided prep, thick plates — half U-groove
Flare-V Groove	Effective throat noted	Round bar or tube to plate, formed sections
Flare-Bevel Groove	Effective throat noted	Round bar or tube to flat surface — one curved member
Plug	Hole diameter left, depth inside symbol, pitch right	Lap joints where fillet access is limited
Slot	Width left, length-pitch right, depth inside symbol	Elongated plug weld for wider lap joints
Spot / Projection	Diameter left, pitch right, number of spots in parens	Resistance welding, sheet metal
Seam	Width left, length-pitch right	Continuous resistance or EBW seam
Surfacing	Height of deposit left, no groove prep	Hard-facing, build-up, overlay
Stud	Size left, pitch right, count in parens below — arrow-side only	Shear connectors in composite construction
Back / Backing	Same symbol for both. Removable backing: add R inside symbol. Distinction is welding sequence: a backing weld is placed before the groove weld, a back weld after.	CJP groove back-gouged and back-welded
Edge	Size (height of deposit) left of symbol	Flanged butt joints in sheet metal, light gauge
Melt-Through	Height of reinforcement left of symbol	CJP welds requiring visible root reinforcement

Supplementary Symbols

Symbol	Graphic	Placement	Meaning
Field Weld		Flag at reference line / arrow junction	Weld to be made in the field (erection site), not in the shop
Weld-All-Around		Circle at reference line / arrow junction	Weld extends completely around the joint perimeter

Section 3Size Notation Quick Reference

Fillet Weld Notation

6Leg size — 6mm equal-leg fillet both sides when on both sides of reference line
6×8Unequal fillet — both sizes appear to the left as S1×S2. Orientation not specified by the symbol; a drawing detail shows which leg goes on which member.
6 left + 50-150 rightIntermittent — leg size (6mm) to left of symbol; length–pitch (50mm weld, 150mm c/c) to right. Not a single hyphenated string.
D(S)Groove notation — groove depth D without parentheses, weld size/effective throat S in parentheses. Per A2.4 §7.2.1.

Groove Weld Notation

D(S)D = groove depth (preparation depth). (S) = weld size/effective throat (design dimension)
12(10)12mm groove depth, 10mm effective throat — D without parentheses, (S) in parentheses
RRoot opening value — often shown in tail or drawing note, not symbol
αGroove angle — typically shown in tail as a degree value (e.g. 45°)

Intermittent Weld Notation

length-pitchWritten right of symbol. Length = each weld run. Pitch = center-to-center spacing
50-15050mm long welds, 150mm apart (center). Net gap = 100mm
staggeredIntermittent symbols offset on arrow side vs other side = chain or staggered

Tail Reference Codes

SMAWShielded Metal Arc Welding (stick)
FCAWFlux Cored Arc Welding
GMAWGas Metal Arc Welding (MIG)
GTAWGas Tungsten Arc Welding (TIG)
WPS-01Refers to specific Welding Procedure Specification document

Section 4Finishing & Contour Codes

Grinding

Angle grinder or belt grinder. Achieves flush or specified contour. Most common field method.

Machining

Mill, lathe, or surface grinder. High-tolerance finish. Used in precision machined weldments.

Chipping

Pneumatic chipping hammer. Removes slag or excess material. Rarely specified for final finish.

Hammering

Peening. Induces compressive stress in surface. Used in fatigue-critical applications.

Rolling

Roller burnishing. Smooths and work-hardens surface. Used in pressure vessels and pipe.

Planishing

Planishing roll or burnishing. Smooths weld surface by controlled plastic deformation. Uncommon in structural work.

Unspecified

Method not specified — contractor may use any suitable method to achieve the required contour.

Flat Contour (flush)

Weld face finished flush with base metal surface. Symbol: straight line above the weld symbol. Typically paired with G, M, or C finish method.

Convex Contour

Weld face has outward curvature above the base metal. Symbol: arc curving away from reference line. Provides extra weld metal at the face.

Concave Contour

Weld face has inward curvature (hollow profile). Symbol: arc curving toward reference line. Sometimes specified for fillet welds to control convexity on non-fatigue members.

Frequently AskedQuestions

Is there a free weld symbol chart PDF?

Yes. Click Print / Save PDF on this page or use your browser's print function. No registration required.

What standard do weld symbol charts follow?

In North America, weld symbols follow AWS A2.4 (currently A2.4:2020). In Europe and internationally, ISO 2553:2019 applies. The two are similar but differ in arrow-side/other-side conventions. Most drawings in the US, Canada, and the Middle East use AWS A2.4. Australia uses AS 1101.3 (aligned with ISO). Always check the drawing title block — it should state which standard governs.

How do I read the size dimensions on a weld symbol?

For fillet welds: the number to the left of the triangle symbol is the leg size. For groove welds: the groove depth (D) appears without parentheses, and the weld size/effective throat (S) appears in parentheses — written as D(S) per A2.4. Numbers on intermittent welds to the right of the symbol read as length–pitch (e.g. 50-150 means 50mm long welds on a 150mm center-to-center pitch).

What do the letters at the tail of a weld symbol mean?

The tail (the forked end of the reference line) contains a specification, process code, or reference. Common examples: a welding process (SMAW, FCAW, GTAW), a WPS number (WPS-001), or a drawing note reference (SEE DWG A-3). If no tail information is needed, the tail is omitted entirely. Per A2.4, the tail is used only when additional information is required that cannot otherwise be shown on the symbol.

What is the difference between AWS A2.4 and ISO 2553 weld symbols?

AWS A2.4 (used in North America) places the weld symbol below the reference line for the arrow side and above for the other side. ISO 2553 (used in Europe and internationally) uses a dashed identification line alongside the solid reference line to indicate the other side. Groove weld dimension placement also differs between the two standards. Most global projects specify which standard governs on the drawing title block.

Weld Symbol Chart PDF