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WELDED JOINTS - SYMBOLIC REPRESENTATION ON DRAWINGS (to BS EN 22553)

1. Elee!t"#$ S$%ol&

The symbols shown below are some of the symbols given in the Standard

De&'!"t'o! Ill&t#"t'o! S$%ol

square butt weld

single-V butt weld

single-bevel butt weld

single-V butt weld with broad root face

single-bevel butt weld with broad root face

single-U butt weld

single-J butt weld

backing run (USA - back or backing weld

fillet weld

!lug weld (USA - slot or !lug weld

s!ot weld (resistance welding

edge weld

Supplementary Notes Rev. 4 8/04

for Welding Inspection

"

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2. Co%'!"t'o!& o* Elee!t"#$ S$%ol&

#lementary symbols are combined for welding from both sides $ as shown below

De&'!"t'o! Ill&t#"t'o! S$%ol

double-V butt weld (% weld

double-bevel butt weld

double-V butt weld with broad root face

double-bevel butt weld with broad root face

double-U butt weld

3. S++lee!t"#$ S$%ol&

#lementary symbols may be su!!lemented by a symbol characterising the sha!e of the e&ternal

surface' or sha!e of the weld

Note

The absence of a supplementary symbol means that the shape of the weld surface does not

need to be indicated precisely.

S,"+e o* el *"/e o# el S$%ol

flat (usually finished flush

conve&

concave

toes shall be blended smooth

!ermanent backing stri! used M

removable backing stri! used MR



)

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0. Met,o o* Re+#e&e!t"t'o!

To s!ecify a weld detail it is necessary to show a weld symbol together with* -

an arrow line $ com!leted by an arrow head

two reference lines consisting of*-

one continuous line one dashed line + (* see eception !elo"#

The arrow line ,oins one end of the continuous reference line to form an angle with it

" arrow line

)a reference line (continuous line

)b identification line (dashed line

. welding symbol

5. Po&'t'o! o* /o!t'!o& l'!e "&,e l'!e

The dashed line can be drawn either above' or beneath' the continuous line $ as shown

or



.

" )b

)a.

,oint

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. Rel"t'o!&,'+ %etee! t,e "##o l'!e "! t,e o'!t

/igures below show the meaning of the 0arrow side1 of the ,oint and the 0other side1 of the ,oint



2

arrow line

0arrow side10other side1

arrow line

0other side10arrow side1

0arrow side1

0arrow side1

arrow line

0other side1

arrow line

0other side1

0arrow side1

of ,oint 3

arrow line Jo'!t A

arrow lineJo'!t B

0other side1

of ,oint A

0arrow side1

of ,oint A

0other side1

of ,oint 3

arrow line

0other side1

of ,oint 3

arrow line

Jo'!t A

Jo'!t B

0arrow side1

of ,oint 3

0arrow side1

of ,oint A

0other side1

of ,oint A

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4. Po&'t'o! o* t,e "##o l'!e

The !osition of the arrow line with res!ect to the weld is no s!ecial significance e/e+tfor

single bevel or single-J welds

/or such details' the arrow has to !oint to the !late that is to be !re!ared

6. Po&'t'o! o* t,e &$%ol 't, #e&+e/t to t,e #e*e#e!/e l'!e

The symbol is !laced either above or beneath the reference line as follows* -

The symbol is !laced on the continuous line side of the reference line if the weld (weld face

is on the arrow side of the ,oint $ as shown below

The symbol is !laced on the dashed line side if the weld (weld face is on the other side of

the ,oint $ as shown below

/or symmetrical welds' the dashed line is unnecessary - 4 should be omitted $ as shown

below



5

the same detail can be shown with the

dashed line !laced above the solid line

the same detail can be shown with thedashed line !laced above the solid line

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7. S+e/'*$'! t,e D'e!&'o!& o* Wel&

Wel /#o&&-&e/t'o! 'e!&'o!&

These are written on the left-hand side of the symbol (before the symbol and certain letters are

used to indicate !articular dimensions' namely* -

s de!th of !enetration

Butt welds are to have complete penetration unless the symbol shows a penetration depth

a = throat thickness (of a fillet weld

Z = leg length (of a fillet weld

s can also be used to show the de!th of !enetration required for a dee! !enetrationfillet weld* -

Wel le!t, 'e!&'o!&

These are written on the right-hand side of the symbol (after the symbol

A .66mm long fillet weld with an 7mm leg would be shown as follows* -



8

a

Z

ss

.66Z 8

a

s

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A! '!te#'tte!t *'llet elwould be shown as follows* -

A &t"e#e '!te#'tte!t *'llet elwould be indicated as below* -

Ot,e# el 'e!&'o! '!'/"to#&

/ 8 width of slot (for a !lug or slot weld

width of weld (for a resistance seam weld

8 diameter of hole (!lug weld

diameter of s!ot (s!ot weld



9

n&l& (eZ

(for a fillet "it$ a

specified leg lengt$#

n &l& (ea

(for a fillet "it$ a

specified t$roat t$ic%ness#

l length of weld

( e ) distance between weld lengths

n number of weld elements

( e ) ll

n &l( ec

c n &l( e

d n ( e

d n ( e

Note

The dashed line is omitted to indicate

that it is a symmetrical weld (fillet si:e

the same on arrow side 4 other side

( e )( e )

n &lZn &lZ

( e ) ( e )ll ( e )

l( e )( e )ll

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19. Co+lee!t"#$ '!'/"t'o!&

Pe#'+,e#"l el&

;hen a weld has to be made all round a !art' the symbol is a circle $ as shown below

:'el o# &'te el&

A flag is used to indicate a field or site weld $ as shown below

I!'/"t'o! o* t,e el'! +#o/e&&

en 22553

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