05-AUG-20061 BASIC WELDING SYMBOLS. 05-AUG-20062 Graphical symbols for welding to convey the complete welding information from the designer to the welder.

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BASIC WELDING SYMBOLS

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• 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

WHAT IS A WELDING SYMBOL?

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 WELDING?

WELD SYMBOLS: It is an ideograph ,used to indicate the type of weld required

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EIGHT ELEMENTS OF WELDING SYMBOLS

ARROW

BASIC WELD SYMBOLS

DIMENSIONS AND OTHER DATA

SUPPLEMENTARY SYMBOLS

COUNTER AND FINISH SYMBOLS

TAIL SPECIFICATIONS

PROCESS OR OTHER REFERENCE

REFERENCE LINE

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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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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.

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.

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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

G-Grinding

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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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REFERENCE LINE AND ARROW

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BASIC WELD SYMBOLS

SQUARE WELD

FILLET WELD

BEVEL

V-GROOVE

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FLARE BEVEL

FLARE-V

Continued….

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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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WELD ALL AROUND

FIELD WELD

SUPPLEMENTARY SYMBOLS

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COUNTER AND FINISH SYMBOLS

FLUSH

CONVEX CONCAVE

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TAIL SPECIFICATIONS

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PROCESS OR OTHER REFERENCE

EBW STANDS FOR - ELECTRONIC BEAM WELDING

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FILLET WELD

ARROW SIDE

BOTH SIDES SAME FILLET SIZE

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BOTH SIDES WITH DIFF.FIILET SIZES

FIILET SIZE WITH LENGTH-INTERMITTENT WELD

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FILLET WELD ALL AROUND