Welding Symbols

Understanding Welding SymbolsTerms and DefinitionsTerms and Definitions

Created By Jeffrey Rodenbarger Drake-Williams Steel

Omaha NebraskaOmaha, Nebraska

•Reference Line

Reference Line (Required element)

Always Horizontal

Arrow Line

Reference Line (Required element)

Arrow

Tail

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

Reference Line (Required element)

Arrow

Tail

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.

Reference Line must always be horizontal,

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

Basic components of a WELDING SYMBOL

Reference Line (Required element)

p f

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

Arrow

TailTail omitted when reference not used

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.

All the way AroundA circle at the tangent of the arrow and the reference line

All the way Around

means welding to be all around.

Field Weld Symbol

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

Weld Symbol Terminology

OTHER SIDE

ARROW SIDEARROW SIDE

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

Fillet Weld (Arrow Side Only)

Fillet Weld (Other Side)

Size of Fillet Weld Noted

1/4

1/4

1/4

D h f Example of Double BevelDepth of preparation or groove

Example of Double Bevel Groove weld

1/4 (5/16)

g

1/4 (5/16)

D th f t tiDepth of penetration

Plug or Slot Weld SymbolPlug or Slot Weld SymbolArrow Side

What does this symbol Represent?

5/16

Represent?5/16

5/16

Single-Bevel-Groove and Double Fillet Weld Symbol

5/16

Fillet Weld Symbol5/16

5/16

Single-Bevel-Groove and Double Fillet weld Symbols

Chain Intermittent Fillet WeldC e e e We dWeld both sides each end and 10 inches center to center in between

1/4 2 10 10 in1/4

1/4

2-10

2-10

10 in

Staggered Intermittent Fillet W ldWeld

Weld ends than 10 inch centers staggered each side

2-101/4

10 in

2-101/4

10 in

FGroove weld size

Finish Symbol Groove Angle included angle of countersink for plug weldsF

A

countersink for plug welds

Root opening; Depth of filling for

S(E) L-P

RDepth of bevel plug and slot welds.

Pitch(Center toLength of weld( ) Pitch(Center-to-center spacing) of weldsARROW SIDE

OTHER SIDE

FIELD

Length of weld

FIELD WELD

(N)Number of spot, seam, stud, plug, slot, or projection welds, p j

The End