Page 83 - Quick Guide to Welding and Weld Inspection by S.E. Hughes, Clifford Matthews
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A Quick Guide to Welding and Weld Inspection
Figure 6.1 Liquid penetrant testing
technique that is often used to confirm visual uncertainties.
Viewing is done under good lighting conditions of 1000 lux
(100 ft candles).
Typical colour contrast penetrants used are solvent
removable, post-emulsifiable or water washable.
Fluorescent penetrants can also be used in solvent remov-
able, post-emulsifiable or water washable form but are
viewed under ultraviolet (UV) light and tend to be more
sensitive than the colour contrast methods. Viewing is done
68
Woodhead Publishing Ltd – A Quick Guide to Welding and Weld Inspection
Data Standards Ltd, Frome, Somerset – 17/9/200906QG Welding chap6.3d Page 68 of 87
