Welding Symbols Developed by the American Welding Society in the 1930’s. Welding symbol refers to the total symbol including all information added to specify the weld(s) required. Weld symbol refers to the symbol for a specific type of weld.
used to apply weld symbol and other data. an arrow A standard welding symbol consists of: a reference line used to apply weld symbol and other data. an arrow connects the reference line to the joint or area to be welded. a tail added only when needed for giving a specific process or other reference.
A welding symbol may or may not use: Basic weld symbol describes the weld accurately and completely Dimensions and other data gives the size/placement of weld Finish symbol method of finish Supplementary symbol weld all around, field weld, contour of finish weld
The arrow is always drawn at an angle to the reference line. The reference line is always drawn horizontal to the bottom of the print. It is never drawn parallel or in the same plane as the reference line.
Standard Welding Symbol
Location of Dimensions
Weld Symbols When the weld symbol appears on the top, the weld is placed on the other side
When the weld symbol appears on the bottom, the weld is placed on the arrow side
Basic Weld Symbols Fillet weld Plug or Slot V-groove Bevel
Spot or Projection Seam Back or Backing Surfacing
U-groove J-groove Square Scarf for braze joint
Edge Stud Flare-V Flare-bevel
Supplementary Symbols Field Weld Weld-all around Melt-thru Consumable Insert
Backing Spacer Flush contour Convex contour Concave contour
Typical Weld Symbols Multiple reference lines
Double fillet symbol
Intermittent fillet symbol
Root opening symbol
Convex contour symbol
Melt-thru symbol
Square v-groove weld symbol
Finishing C chipping G grinding H hammering M machining R rolling
Welding Symbol Examples Fillet weld arrow side
Fillet weld other side
Fillet weld-all around
Length and pitch of weld 1-3 1” 3”
Size of weld 3/8” 3/8”
Weld Positions 1 flat 2 horizontal 3 vertical 4 overhead 5 pipe weld
G groove weld F fillet weld