welding symboleszz

8/12/2019 Welding Symboleszz

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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 (US - back or backing weld!

"illet weld

#lug weld (US - slot or $lug weld!

S$ot weld (resistance welding!

%dge weld

Supplementary Notes Rev. 3 7/04

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 e!ception "elo#$

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

& 0 arrow line

,a 0 reference line (continuous line!

,b 0 identification line (dashed line!

1 0 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



1

& ,b

,a1

/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 2arrow side3 of the /oint and the 2other side3 of the /oint



4

arrow line

2arrow side32other side3

arrow line

2other side32arrow side3

arrow line

2arrow side3

2other side3

arrow line

2other side3

2arrow side3

arrow line/oint

2arrow side3

of /oint 2other side3

of /oint

/oint B

arrow line

/oint

2arrow side3

of /oint B2other side3

of /oint

/ointB


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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 these* arrow line has to $oint to the $late that is $re$ared+

This same detail can be indicated by moving the $osition of the dashed line (other side! ' as

shown below -

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

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

the /oint

This is illustrated below -

NoteFor symmetrical welds, the dashed line is unnecessary - & should be omitted as shown.



5

To be welded on the arrow side To be welded on the other side


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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 0 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!

166mm long fillet weld with an 7mm leg would be shown as follows -



8

a

Z

ss

166Z 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) (e!Z

(for a fillet #it% a

specified leg lengt%$

n )l) (e!a

(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( e!c

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 ; other side!

( e )

( e )

n )lZ

n )lZ

( e ) ( e )ll ( e )

l( e )( e )ll


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

Pe#'+,e#"l el&

4681 gives the numbers allocatedfor each welding $rocess* e+g+*

@@

S

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