1. BASIC WELDING SYMBOLS
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2. WHAT IS A WELDING SYMBOL?
WHAT IS WELDING?
A metal-joining process that uses the heat generated by a combination of oxygen
and a fuel gas to melt two similar metals together and are integrally joined
when cooled.
WHAT IS A WELDING SYMBOL?
Graphical symbols for welding to convey the complete welding information from
the designer to the welder in terms of drawings.
It denotes a symbol made up of several elements to convey the welding instruction
WELD SYMBOLS: It is an ideograph ,used to indicate the type of weld required
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3. EIGHT ELEMENTS OF WELDING SYMBOLS
REFERENCE LINE
ARROW
BASIC WELD SYMBOLS
DIMENSIONS AND OTHER DATA
SUPPLEMENTARY SYMBOLS
COUNTER AND FINISH SYMBOLS
TAIL SPECIFICATIONS
PROCESS OR OTHER REFERENCE
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4. Basics of the welding symbol
Reference line
Basics of the welding symbol
Other elements are oriented with respect to this line
Arrow
Arrow side
Other side-opposite side
Basic weld symbol
Indicates the type of welding to be performed
Placed on center of the reference line, either below or above or on both
sides.
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5. Supplementary Symbols:
Placed at the end of the reference line at the base of the arrow
Conveys additional information relative to the extent of welding, where the welding is to be performed.
Dimensions:
Length-Right
Size-Left
Spacing of the weld or weld symbols
If length is followed by Dash and another number –indicates center to center
spacing of intermittent welds.
The number of spot or projection weld is enclosed in parentheses.
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6. Counter and finish symbols:
The counter symbol is placed above or below the weld symbol
Finish symbol always appears above or below the counter symbol
Finish Symbols:
C-Chipping
G-Grinding
H-Hammering
M-Machining
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7. It is used to locate specification, process of other reference
Tail Specification:
It will appear on the end of the reference line opposite to the arrow end.
It is used to locate specification, process of other reference
If no tail-When no spec.
Specification and process:
Placed in the tail of the welding symbol
If the spec is given in notes, or indicated elsewhere on the drawing,
it should not be used.
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8. 05-AUG-2006

9. REFERENCE LINE AND ARROW
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10. BASIC WELD SYMBOLS
SQUARE WELD
FILLET WELD
BEVEL
V-GROOVE
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11. Continued….
FLARE BEVEL
FLARE-V
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12. DIMENSIONS AND OTHER DATA
FILLET SIZE
FILLET LENGTH
IF THE FILLET LENGTH IS FOLLOWED BY A DASH
AND A NUMBER ,i.e. CENTER-TO-CENTER
DISTANCE OF INTERMITTENT WELDS.
GROOVE ANGLE
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13. SUPPLEMENTARY SYMBOLS
WELD ALL AROUND
FIELD WELD
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14. COUNTER AND FINISH SYMBOLS
FLUSH
CONVEX
CONCAVE
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15. TAIL SPECIFICATIONS
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16. PROCESS OR OTHER REFERENCE
EBW STANDS FOR - ELECTRONIC BEAM WELDING
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17. BOTH SIDES SAME FILLET SIZE
FILLET WELD
ARROW SIDE
BOTH SIDES SAME FILLET SIZE
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18. BOTH SIDES WITH DIFF.FIILET SIZES
FIILET SIZE WITH LENGTH-INTERMITTENT WELD
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19. FILLET WELD ALL AROUND
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