Civil Engineering Reference
In-Depth Information
fillet weld is to be tested, it would be indicated by two arrows, one
on each side of the joint. Figure 16.1 shows that NDT and weld
symbols may be combined on the same reference line or, alterna-
tively, two reference lines may be used.
The direction of radiation for radiographic testing may be indi-
cated (see
Fig. 16.2
). The field test symbol (
Fig. 16.3
) and the test
all-round symbol (
Fig. 16.4
) are similar to the corresponding weld
symbols.
RT
16.2
Symbols for direction
of radiographic testing
(AWS).
16.3
Field test
symbol (AWS).
16.4
Test all-
round symbol
(AWS).
For the clarification of complex drawings the symbols for non-
destructive testing can be included on a separate drawing from that
showing welding symbols.
An NDT procedure sheet would normally be needed to supple-
ment the welding symbol, especially if inspection is required during
welding to confirm freedom from cracking. This could involve dye
penetrant or magnetic particle inspection between weld passes, a
procedure that the welding symbol alone could not indicate.
Visual inspection should nearly always be carried out during the
welding operation to detect any flaws as well as distortion because
it is easier to rectify at an intermediate stage than after welding is
completed.
