Welding symbols on drawings - .:YUSUF MANSUROGLU - P

Seam welds
The notation for the sizes and spacing of intermittent seam welds is
shown in Fig. 12.5. The only difference in the meaning of the letters
is that in the AWS system the letter e indicates the pitch of the welds,
i.e. centre to centre, whereas in the ISO standard the bracketed letter
(e) refers to the distance between welds.
The seam welding symbol in the ISO system refers to resistance
welding, whereas in the AWS standard, the symbol includes other
processes such as arc or electron beam welding. Therefore, in the
ISO system the symbol is always placed with its centre on the reference
line. In the AWS system it may be placed above or below the
line, depending on whether the weld is made from the arrow side
or the other side.
AWS A2.4-98 gives comprehensive descriptions of the symbolisation
of seam and other resistance welding processes. This standard
should be consulted for authoritative guidance.
36 <strong>Welding</strong> <strong>symbols</strong> on drawings
ISO
C n × 1 (e)
Width of weld at interface
Length of each weld
Distance between welds
Pitch of welds
Number of welds
12.5 Symbolisation of resistance seam welds.
C
ISO
C
1
(e)
-
n
AWS
(n)
1 – e
AWS
C
1
-
e
(n)