Spot and seam welds - Welding Symbols on Drawings - page 34

12 Spot and seam welds

Resistance spot welds

Resistance spot welding requires access to both sides of the joint.
The weld symbol is centred on the reference line (see Fig. 12.1 ).

ISO AWS Symbols

(n)

d = spot diameter
n = number of welds
e = pitch

d n (e) d e

12.1 Symbolisation of a resistance spot weld.

Other details of the welding symbol shown in Fig. 12.1 are com-
pared in Table 12.1 .

Table 12.1 Symbols for dimensions and spacing of resistance spot welds

Details ISO AWS

Spot diameter at interface d d

Number of welds n (n)

Pitch (e) e

An example of the application of the welding symbol is shown in
Fig. 12.2 . Under the heading 'Strength', AWS A2.4-98 specifies that
the strength of a spot weld shall be indicated by a number quoting
pounds or newtons placed in front of the weld symbol. The strength
of a spot weld is related to its size and it is questionable whether
mechanical properties should form part of a welding symbol. The
purpose of this option and for whom the information is intended are
not clear.

Illustration ISO AWS

3

(5)

6 5 (75) 1/4 3

1 1

6

4 4

75

12.2 Examples of resistance spot weld symbols. ISO dimensions are in millimetres; AWS
dimensions are in inches.