Welding symbols on drawings - .:YUSUF MANSUROGLU - P
Welding symbols on drawings - .:YUSUF MANSUROGLU - P
Welding symbols on drawings - .:YUSUF MANSUROGLU - P
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
12 Spot and seam welds<br />
Resistance spot welds<br />
Resistance spot welding requires access to both sides of the joint.<br />
The weld symbol is centred <strong>on</strong> the reference line (see Fig. 12.1).<br />
34 <str<strong>on</strong>g>Welding</str<strong>on</strong>g> <str<strong>on</strong>g>symbols</str<strong>on</strong>g> <strong>on</strong> <strong>drawings</strong><br />
ISO AWS Symbols<br />
(n)<br />
d n (e) d e<br />
12.1 Symbolisati<strong>on</strong> of a resistance spot weld.<br />
Other details of the welding symbol shown in Fig. 12.1 are compared<br />
in Table 12.1.<br />
Table 12.1 Symbols for dimensi<strong>on</strong>s and spacing of resistance spot welds<br />
Details ISO AWS<br />
Spot diameter at interface d d<br />
Number of welds n (n)<br />
Pitch (e) e<br />
An example of the applicati<strong>on</strong> of the welding symbol is shown in<br />
Fig. 12.2. Under the heading ‘Strength’, AWS A2.4-98 specifies that<br />
the strength of a spot weld shall be indicated by a number quoting<br />
pounds or newt<strong>on</strong>s placed in fr<strong>on</strong>t of the weld symbol. The strength<br />
of a spot weld is related to its size and it is questi<strong>on</strong>able whether<br />
mechanical properties should form part of a welding symbol. The<br />
purpose of this opti<strong>on</strong> and for whom the informati<strong>on</strong> is intended are<br />
not clear.<br />
6<br />
3<br />
75<br />
Illustrati<strong>on</strong><br />
1<br />
4<br />
1<br />
4<br />
d = spot diameter<br />
n = number of welds<br />
e = pitch<br />
ISO AWS<br />
(5)<br />
6 5 (75) 1/4 3<br />
12.2 Examples of resistance spot weld <str<strong>on</strong>g>symbols</str<strong>on</strong>g>. ISO dimensi<strong>on</strong>s are in millimetres; AWS<br />
dimensi<strong>on</strong>s are in inches.