American Welding Society Welding Symbol Chart
Basic Welding Symbols and Their Location Significance
Location
Significance
Fillet
Spot or
Projection
Plug or Slot
Stud
Typical Welding Symbols
Back or
Backing
Seam
Surfacing
Double-Fillet Welding Symbol
Edge
Chain Intermittent Fillet Welding Symbol
Length
Arrow Side
Not Used
Not Used
Both Sides
No Arrow or
Other Side
Significance
Square
Not Used
Not Used
Not Used
Not Used
Location
Significance
Not Used
Not Used
Not Used
V
Not Used
Not Used
Groove
U
Bevel
Omission of Length Indicates that
Weld Extends Between Abrupt Changes
in Direction or as Dimensioned
Flash or Upset Welding Symbol
Not Used
Not Used
Flare-V
J
Flare-Bevel
Included Angle of
Countersink
Not Used
Scarf for
Brazed Joint
Pitch (Distance
Between Centers)
of Welds
Plug Weld Size
(Diameter of
Hole at Root)
Pitch (Distance
Between Centers)
of Segments
Fillet Weld Size
(Length of Leg)
Length of
Segments
Joint with Backing
Backing
Weld
Back
Weld
OR
OR
1st Operation
1st Operation
2nd Operation
Melt-Thru Symbol
Joint with Backing
Number of Welds
Pitch
Spot Weld Size
Other Side
Pitch
Stud Size
Not Used
Not Used
Not Used
Not Used
Supplementary Symbols
Weld-All-Around
Field Weld
Not Used
Not Used
Consumable Insert
Finish Symbol
Basic Joints
Identification of Arrow Side and Other Side Joint
Butt Joint
Corner Joint
Arrow Side
of Joint
Depth of Bevel;
Size or Strength
for Certain Welds
Specification,
Process, or Other
Reference
T
Tail (May Be
Omitted
When
Reference is
Not Used)
Arrow Side
of Joint
T-Joint
Lap Joint
Arrow Side of Joint
(N)
Elements in This Area
Remain As Shown When
Tail and Arrow are Reversed
Weld Symbols Shall be Contained Within
the Length of the Reference Line
Other Side
of Joint
Arrow of
Welding
Symbol
Edge Joint
Other Side
Member of
Joint
Other Side
of Joint
Arrow of Welding Symbol
Field Weld
Symbol
Weld-AllAround
Symbol
Groove
Weld Size
Root Opening
Flash or Upset Welding Symbol
Groove
Weld Size
Root
Opening
Groove Angle
Melt-Thru Symbol
Joint with Backing
Depth of
Bevel
Groove Weld Size
Backing Weld
Backgouge
Flash or Upset Welding Symbol
1st Operation On Line
Nearest Arrow
Groove Weld Size
Melt-Thru Symbol
Joint with Backing
Indicates Complete Joint Penetration
Regardless of Type of Weld
or Joint Geometry
Edge Weld
Size
3rd Operation
Flash or Upset Welding Symbol
Melt-Thru Symbol
Joint with Backing
Process Reference
Process Abbreviations
Root Reinforcement
Joint with Spacer
Flush Contour Symbol
With Modified Groove Weld Symbol
Back Weld
Other Side
of Joint
Groove Weld Size
Arrow Points Toward
Member to be Beveled
2nd Operation
Arrow Connecting
Reference Line to
Arrow Side
Member of Joint
or Arrow Side of
Joint
Where process abbreviations are to be
included in the tail of the welding symbol,
reference is made to Table 1, Designation
of Welding and Allied Processes by
Letters, of ANSI/AWS A2.4-98.
Arrow Side of Joint
Arrow of
Welding
Symbol
Arrow Side
Member of
Joint
} L-P
}
Reference
Line
Number of Spot, Seam,
Stud, Plug, Slot, or
Projection Welds
Weld Symbol
Other Side
of Joint
S(E) {
{
F
A
R
Groove Weld Size
Pitch (Center-to-Center Spacing) of Weld
Segments
OTHER
SIDES
Concave
ARROW
SIDE
Convex
Spacer
Arrow of
Welding
Symbol
Length of Weld
SIDES
Flush
Backing
Arrow of
Welding
Symbol
Groove Weld Size
Contour
SIDES
Backing Spacer (Rectangular)
Root Opening; Depth
of Filling for Plug and
Slot Welds
Contour Symbol
(Square)
Pitch
Joint with Backing
Depth of
Bevel
Groove Angle; Included Angle of
Countersink for Plug Welds
Increment
Length
Process
Melt-Thru Symbol
Not Used
Location of Elements of a Welding Symbol
Melt-Thru
Seam Weld
Size
Number of
Studs
Process
Flash or Upset Welding Symbol
No Arrow or
Other Side
Significance
Length of
Segments
2nd Operation
Depth of Filling (Omission
Indicates Filling is Complete)
Both Sides
Fillet Weld Size
(Length of Leg)
Melt-Thru Symbol
Flash or Upset Welding Symbol
Arrow Side
Staggered Intermittent Fillet Welding Symbol
Pitch (Distance
Between Centers)
of Segments
Fillet Weld Size
Other Side
A2.1:1998
Second Printing
American Welding Society
550 N.W. LeJune Road
Miami, Florida 33126
Double-Bevel Groove
It should be understood that these charts are intended only as shop aids. The only complete and official presentation of the standard welding symbols is in AWS A2.4, Standard Symbols for Welding, Brazing, and Nondestructive Examinations.
'R' Indicates Backing
Removed After Welding
Convex Contour Symbol