TWI Cswip 3.1wis 5 Welding Inspection Welding Symbols BSEN ISO 22553 /AWS A2

TWI
CSWIP 3.1WIS 5
WELDING INSPECTION
WELDING SYMBOLS
BSEN ISO 22553 /AWS A2.
SECTION 8
Weld symbols on drawings

One method of transferring information from
the design office to the workshop could be:
Please
weld
This method does nothere
give enough information
and does not convey the actual or design
requirements.
Most countries have their own standards for
symbols.
The two most common are BS EN 22553 (ISO
2553), which has now replaced BS 499 Part 2 &
AWS A2.4

Welded joints may be indicated:
- by detailed sketches, showing every dimension
or by symbolic representation

Advantages of symbolic representation:
simple and accurate

should not over-complicate the drawing
no need for additional views
should give all necessary information regarding the
specific joint to be obtained
Disadvantages of symbolic representation:

can only be used only for standard joints
requires training for properly understanding of
symbols
WELDING SYMBOLS
BS EN ISO 22553.
Welded,brazed and soldered
joints Symbolic representation on
drawings.
WELDING SYMBOLS
BSEN 22553 (UK & Europe)
There are 7 components to this standard;
1. THE ARROW LINE
2. THE DUAL REFERENCE LINE
3. THE ELEMENTARY SYMBOL
4. COMBINED SYMBOLS FOR SYMMETRICAL
WELDS
5. THE SUPPLEMENTARY SYMBOL
6. DIMENSIONS
7. COMPLEMENTARY INDICATIONS
ARROW LINE
Convention of the arrow line:
a)
b)
Shall touch the joint intersection

Shall not be parallel to the drawing
c) Shall point towards a single plate

preparation (when only one plate has
preparation)
OTHER
SIDE
ARROW SIDE
THE DUAL REFERENCE LINE

Convention of the reference
line:
a) Shall touch the arrow line
b) Shall be parallel to the bottom of the
drawing
c) There shall be a further broken line
above or beneath the reference line ,
identification line. (Not necessary
where
o
the weld is symmetrical!) r
BS EN 22553 - example
Arrow side
Other side
Joint A
Other side joint A
Arrow side joint B
Joint B
Arrow side joint A
Other side joint B
Joint A
Other side joint B
Arrow side joint B
Joint B
Arrow side joint A
Other side joint A
Other side
Arrow side
TABLE 1-ELEMENTARY SYMBOLS

Various categories of joints are characterised by an
elementary symbol.
The elementary symbol is similar to the shape of the
weld to be made.
Weld type
Square butt weld
Single V butt weld
Sketch
Symbol
TABLE 1 - ELEMENTARY SYMBOLS

Weld type
Single-V butt weld
with broad root face
Single bevel butt

weld
Single bevel butt
weld with broad root
face
Backing run
Sketch
Symbol

Weld type
Single-U
butt weld
Single-J
butt weld
Fillet weld
Surfacing
Sketch
Symbol

Weld type
Edge weld
Sketch
Symbol
TABLE 2 - COMBINED SYMBOLS FOR SYMMETRICAL

WELDS
Representation of welds done from both

sides of the joint intersection, touched by
the arrow head
Double
V
Double
bevel
Double U
Fillet
weld
Double J
SYMMETRICAL WELDS
TABLE 3 - SUPPLEMENTARY SYMBOLS.

Supplementary weld
symbols;
Ground
flush
OR
TABLE 3 -SUPPLEMENTARY SYMBOLS

Supplementary weld
symbols;
Convex
Concave
SUPPLEMENTARY SYMBOLS
Supplementary weld
symbols;
Toes shall be blended smoothly
TABLE 3 - SUPPLEMENTARY SYMBOLS

Supplementary weld
symbols;
Removable
backing
strip used
MR
Permanent
backing
strip used
METHOD OF REPRESENTATION
WELD SYMBOL
REFERENCE LINE
ARROW LINE
IDENTIFICATION LINE
BS EN 22553 rules - example
Arrow side
Arrow side
Other side
Other side
DIMENSIONS
Dimensions;
Leg length prefixed by the letter z.
Design throat thickness prefixed by
the letter a.
z6
a4.2
Fillet welds
Fillet weld dimensions according BS EN
22553
z8
or
z8
z8
a5
5
8
or
a5 z8
DIMENSIONS
Dimensions;
For intermittent fillet welds
z1
0
25
( 50 )
Number of welds (n) x Length of weld (l)

( Distance between each weld (e))
z 10
3 x 25
(50)
50
25
10
DIMENSIONS
Dimensions;
For deep penetration fillet welds.
s8
s = Effective throat
thickness
DIMENSIONS
Dimensions;
For single vee butt welds with a
broad root face (partial penetration
welds).
s6
s = nominal throat
thickness
PARTIAL PENETRATION WELDS
s6
6
4
10
INTERMITTENT FILLET WELDS

Chain intermittent fillet weld
Distance between
(e)
length (l)
z
z
z
nl(e
)nl(e
)
Symbol to BS EN 22553
a
a
or
nl(e
)nl(e
)
STAGGERED INTERMITTENT
Staggered intermittent fillet weld
Distance(e)
length
(l)
z
z
nl
(e)
z nl
(e)
Symbol to BS EN 22553
a nl
a (e)
nl
(e)
or
COMPLEMENTARY INDICATIONS
Weld all round ( peripheral weld )
Site (Field) Weld
Indication of welding process to
ISO 4063;
MMA111.
MIG-131. MAG135.
FCAW136
TIG-141
111
Indication of welding
procedure
WPS
Non Destructive
Testing - other than
visual
NDT
BS EN 22553 rules
Welds Arrow Side of joint, Symbol on the Solid reference
line. Welds on Other Side of the joint, Symbol on the
Dashed identification line.
Symbols with a Vertical Line component must be drawn
with the vertical line to the Left side of the symbol
All CSA dimensions are shown to the Left of the symbol
All Linear dimensions are shown on the Right of the
symbol i.e. number of welds, length of welds and
distance between welds
The dashed line must be omitted when
symmetrical welds are required
BS EN 22553 rules
Fillet welds that are intermittent and staggered

are shown by an Elongated Z symbol through
the dual reference line.
WELD SYMBOLS
QUESTIONS ?
ANSWERS TO EXERCISES
BS EN 22553 FILLET WELDS
1
z6
2
z6
z6
25
3x 25 (40)
3x 25 (40)
40
40
25
ANSWERS TO EXERCISES.
3
40
30
50
z6
3x 50 (25)
z10
3x 40 (30)
40
25
30
50
40
25
50
4
25
50
20
z8
3x 25 (50)
z10
2x 20 (40)
25
40
50
20
25
BS EN 22553 BUTT WELDS
1
2
s10
3
BS EN 22553 BUTT
WELDS
4
z8
s12
z12
AWS A 2.4 RULES

Welds on arrow side of joint go underneath
the reference line while welds the other side
of the joint, go on top of the reference line
Symbols with a vertical line component must be
drawn with the vertical line to the left side of
the symbol
All CSA dimensions are shown to the left of the
symbol
All linear dimensions are shown on the right of
the symbol i.e. number of welds, length of
welds, length of any spaces
AWS A 2.4 SUMMARY

Welds on arrow side of joint symbol below the
reference line.
welds on other side of the joint, symbol above
the reference line.
Arrow
Side
Other
Side
AWS A 2.4 SUMMARY

Use of 3 reference lines to show sequence of
operations.
3
UT
2
1
AWS A 2.4 SUMMARY

Staggered intermittent fillet welds are
indicated by the symbol about the reference
line.
AWS A 2.4 SUMMARY

Fillet weld distances are measured center to
center
AWS A 2.4 SUMMARY

Definite break in the arrow line when only one
side is prepared.
AWS A 2.4 SUMMARY

Dimensions may be shown in imperial
measurement.
3/4
or
0.75
"
NDT PRACTICLE.
QUESTIONS ?
WELD SYMBOLS
QUESTIONS ?
Reference line
Convention of the reference line AWS
A 2.4
a) Shall touch the arrow line
b) Shall be parallel to the bottom of the

drawing
AWS A 2.4 rules-example
10
3 x 50 (70)
70
50
10
Fillet welds
Fillet weld dimensions according AWS A
2.4
5x8
5
8
5legon
vertical
member
Intermittent fillet welds

Chain intermittent fillet weld
pitch
(e)
length
(l)
z
z
z
Symbol to AWS A2.4
l-e
l-e
Intermittent fillet welds

Staggered intermittent fillet weld
pitch
(e)
e/2
length
(l)
z
z
z
Symbol to AWS A2.4
l-e
l-e

Example:
Draw the symbols for the weld given as
shown below to the specification BS EN
22553
MM
Weld drawing
A
Symbol
Drawing
111
Solution BS EN
22553
Note that the arrow
lines are not drawn
correctly in the notes
on page 8.7
a7z
10
s 35
135/111
s 15
z 10
z
10
s 30
s 20
z
10
BS EN 22553 Welding Symbols
13
10
s10
10
Partial penetration single-V butt

S indicates the depth of penetration
15
Solution AWS
A2.4
10
30
20
10
10
35
15
10

Student symbols exercise
Complete a symbols drawing for the welded
joint given below to AWS A2.4 & BS EN
22553
7
10
35
20
15
30
All fillet weld leg lengths are 10 mm

mm

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Weld symbols on drawings

Weld symbols on drawings

Weld symbols on drawings

simple and accurate

Disadvantages of symbolic representation:

Shall touch the joint intersection

c) Shall point towards a single plate

THE DUAL REFERENCE LINE

Arrow side joint B

Arrow side joint A

Other side joint B

Arrow side joint B

Arrow side joint A

Other side joint A

TABLE 1-ELEMENTARY SYMBOLS

Square butt weld

Single V butt weld

TABLE 1 - ELEMENTARY SYMBOLS

Single bevel butt

TABLE 1 - ELEMENTARY SYMBOLS

TABLE 1 - ELEMENTARY SYMBOLS

TABLE 2 - COMBINED SYMBOLS FOR SYMMETRICAL

Representation of welds done from both

TABLE 3 - SUPPLEMENTARY SYMBOLS.

TABLE 3 -SUPPLEMENTARY SYMBOLS

TABLE 3 - SUPPLEMENTARY SYMBOLS

BS EN 22553 rules - example

BS EN 22553 rules - example

Number of welds (n) x Length of weld (l)

BS EN 22553 rules - example

PARTIAL PENETRATION WELDS

INTERMITTENT FILLET WELDS

Weld all round ( peripheral weld )

Site (Field) Weld

Fillet welds that are intermittent and staggered

AWS A 2.4 RULES

AWS A 2.4 SUMMARY

AWS A 2.4 SUMMARY

AWS A 2.4 SUMMARY

AWS A 2.4 SUMMARY

AWS A 2.4 SUMMARY

AWS A 2.4 SUMMARY

b) Shall be parallel to the bottom of the

AWS A 2.4 rules-example

Intermittent fillet welds

Symbol to AWS A2.4

Intermittent fillet welds

Symbol to AWS A2.4

Weld symbols on drawings

Weld symbols on drawings

BS EN 22553 Welding Symbols

Partial penetration single-V butt

Weld symbols on drawings

Weld symbols on drawings

All fillet weld leg lengths are 10 mm

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