Welding Symbols - Sparks High Manufacturing Program
Sparks High Manufacturing/Technology Academy Understanding Welding Symbols Terms and Definitions
Reference Line (Required element) Always Horizontal Reference Line (Required element) Arrow
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. 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 or weld area. Basic components of a WELDING SYMBOL Reference Line (Required element) Arrow connects reference line to arrow side
member of joint or arrow side of joint Arrow Tail omitted when reference not used 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. A circle at the tangent of the arrow and the reference line means welding to be all around. A flag at the tangent of the reference line and
arrow means Field Weld. OTHER SIDE ARROW SIDE 1/4 1/4
Depth of preparation or groove (5/16)
1/4 1/4 (5/16) Depth of penetration Arrow Side
5/16 5/16 5/16 5/16
Weld both sides each end and 10 inches center to center in between 1/4
2-10 1/4 2-10 10 in
Weld ends than 10 inch centers staggered each side 1/4 2-10
1/4 2-10 10 in 10 in
Finish Symbol Groove weld size F A Depth of bevel
R Groove Angle included angle of countersink for plug welds Root opening; Depth of filling for plug and slot welds.
S(E) Length of weld L-P OTHER SIDE ARROW SIDE FIELD
WELD (N) Number of spot, seam, stud, plug, slot, or projection welds Pitch(Center-tocenter spacing) of
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