Welding Symbols(ISO 2553)

Basic Weld Types

Groove welds

Fillet weldPlug / slot weld

Spot / seam weld

Applicable Welds for Lap joint

Plug / slot weldSpot / seam weld

Fillet weld

Applicable Welds for Butt joint

Double V Groove weld

Double U Groove weld

Double Bevel Groove weld

Double J Groove weld

Applicable Welds for Butt joint

Square Groove weld V Groove weld

U Groove weldBevel Groove weld

J Groove weld

Applicable Welds for Tee joint

Elements of Welding Symbols• The assembled welding symbol consists of the

following eight elements, or such of these elements as necessary.

• Reference line• Arrow• Basic weld symbols• Dimensions and other data• Supplementary symbols• Finish Symbols• Tail• Specification, Process or other references

Reference Line (Required element)

Arrow

Tail

Reference Line must always be horizontal,

Arrow points to the line or lines on drawing which clearly identify the proposed joint or weld area.

The tail of the welding symbol is used to indicate the welding or cutting processes, as well as the welding specification, procedures, or the supplementary information to be used in making the weld.

Basic components of a WELDING SYMBOL

Tail omitted when reference not used

Arrow connects reference line to arrow side member of joint or arrow side of joint

S(E) L-P

F

A

R

(N)

Depth of bevel

Groove weld size

Finish Symbol

Groove Angle included angle of countersink for plug welds

Root opening; Depth of filling for plug and slot welds.

Pitch(Center-to-center spacing) of welds

Number of spot, seam, stud, plug, slot, or projection welds

ARROW SIDE

OTHER SIDE

FIELD/SITE WELD

Length of weld

ARC & GAS WELDING SYMBOLS(Elementary)

Bead

TYPE OF WELD

FilletPlug

Slot Square V Bevel U J

Groove or

ELEMENTARY WELD SYMBOLSSquare Groove Weld

Single V Groove Weld

ELEMENTARY WELD SYMBOLSSingle Bevel Groove Weld

Single V Groove Weld with Broad Root Face

ELEMENTARY WELD SYMBOLSSingle Bevel Groove Weld with Broad Root Face

Single U Groove Weld

ELEMENTARY WELD SYMBOLSSingle J Groove Weld

Backing Weld

ELEMENTARY WELD SYMBOLS

Fillet Weld

Plug / Slot Weld

ELEMENTARY WELD SYMBOLS

Spot Weld

Seam Weld

ELEMENTARY WELD SYMBOLSEdge Weld

Surfacing

RESISTANCE WELD SYMBOL

SPOT

SEAM XXX

PROTECTION

FLASH OR UPSET

SUPPLEMENTARY SYMBOL

WELD ALL AROUND

FIELD WELD CONTOURFLUSH CONVEX CONCAVE

SUPPLEMENTARY SYMBOLS

Toes blended smoothly

Permanent Backing Strip

M

Removable Backing Strip

MR

SUPPLEMENTARY SYMBOLSPeripheral Welds

SUPPLEMENTARY SYMBOLS

Site welds

SUPPLEMENTARY SYMBOLS

(Tail Optional)

Sequence of Information in the Tail

• Process (as per ISO 4063)

• Acceptance Level (as per ISO 5817 or ISO 10042)

• Working Position (as per ISO 6947)

• Filler Materials (as per ISO 544 or ISO 2560 or ISO 3581)

EXAMPLES OF APPLICATION

Method of representation

Weld Joint

Arrow Line

Reference Line (Continuous)

Reference Line (Dashed)

EXAMPLES OF APPLICATION

Welding on the Arrow Side

Arrow Side

Other Side

EXAMPLES OF APPLICATION

Welding on the Other Side

Arrow Side

Other Side

EXAMPLES OF APPLICATIONWelding on the Other Side

Other Side

Arrow Side

EXAMPLES OF APPLICATIONWelding on the Arrow Side

Other Side

Arrow Side

EXAMPLES OF APPLICATION

Which is the Other Side in this case?

Side A

Side C

Side B

Side D

EXAMPLES OF APPLICATIONWelding on both Sides

Other Side

Arrow Side

EXAMPLES OF APPLICATION

Symmetric Welding on both Sides

EXAMPLES OF APPLICATION

Pointing of Arrows for Bevel and J Joints

OR

EXAMPLES OF APPLICATION

Pointing of Arrows for Bevel and J Joints

DIMENSIONING OF WELDS

Butt Joints

l

s l s

DIMENSIONING OF WELDSFillet Welds

z5 l5

5

a5 l

5

DIMENSIONING OF WELDS

Fillet Welds

a a a

DIMENSIONING OF WELDS

Intermittent Fillet Welds

l (e) l (e)

z n x l (e)

z n x l (e)

DIMENSIONING OF WELDS

Staggered Intermittent Fillet Welds

z n x l (e)

z n x l (e)

l (e) l (e)

l (e) l (e)

DIMENSIONING OF WELDS

Spot Weld

d n (e)

d

e e

DIMENSIONING OF WELDS

Slot Weld

d n x l (e)

d

l e

DIMENSIONING OF WELDS

Seam Weld

d n x l (e)

d

l e

DIMENSIONING OF WELDS

Plug Weld

d n (e)

d

e e

Reference Line (Required element)

Arrow

Tail

Reference Line must always be horizontal,

Arrow points to the line or lines on drawing which clearly identify the proposed joint or weld area.

The tail of the welding symbol is used to indicate the welding or cutting processes, as well as the welding specification, procedures, or the supplementary information to be used in making the weld.

A circle at the tangent of the arrow and the reference line means welding to be all around.

All the way Around

A flag at the tangent of the reference line and arrow means Field Weld.

Field Weld Symbol

ARROW SIDE

OTHER SIDE

Weld Symbol Terminology

Break in arrow means arrow side must be side that beveling or other preparation required.

Fillet Weld (Arrow Side Only)

Fillet Weld (Other Side)

1/4

1/4

Size of Fillet Weld Noted

1/4

1/4

(5/16)

(5/16)

Depth of preparation or groove

Depth of penetration

Example of Double Bevel Groove weld

Plug or Slot Weld SymbolArrow Side

5/16

5/16

What does this symbol Represent?

5/16

5/16

Single-Bevel-Groove and Double Fillet Weld Symbol

Single-Bevel-Groove and Double Fillet weld Symbols

Chain Intermittent Fillet WeldWeld both sides each end and 10 inches center to center in between

1/4

1/4

2-10

2-10

10 in

Staggered Intermittent Fillet Weld

Weld ends than 10 inch centers staggered each side

10 in

10 in

2-10

2-101/4

1/4

The End

Welding Position – Groove

1 G

2 G

3 G

4 G

Welding Position – Groove

1 G 2 G

5 G 6 G

45°

Welding Position – Fillet

1F

2F3F

4F

Welding Position – Fillet1F

2F

5F