Civil Engineering Reference
In-Depth Information
Arc spot welds
Arc spot welding is carried out from one side of the joint so the weld
symbol is placed on one side of the reference line as shown in
Fig.
12.3
. This figure also shows the different ways of indicating the
number of welds in the ISO and AWS standards.
Illustration
ISO
AWS
4
3
10
3 (100)
10
8
3/8
4
(3)
3
8
100
12.3
Examples of arc spot weld symbols. ISO dimensions are in millimetres; AWS dimensions are in inches.
The nomenclature for both resistance and arc spot welds in the
ISO and AWS systems is similar, apart from the placement of the
brackets and the figure for the number of welds.
Projection welds
In both the ISO and AWS standards the weld symbols for spot and
projection welds are identical, but have additional indications. In
the ISO system the letter P is placed in front of the weld size and in
the AWS standard the letters PW are placed in the tail of the refer-
ence line. A reference to the size of the projection by a separate
sketch is indicated in the tail in the AWS system, as shown in
Fig.
12.4
. This figure also shows that the weld symbol in the AWS system
is placed above or below the reference line, depending on which
member is to be embossed.
1
8
7
16
DETAIL A
PW
(SEE A)
PW
(SEE A)
Other side
embossed
12.4
Symbolisation of projection weld (AWS) (dimensions are in inches).
Arrow side
embossed
