ASNT Level III- Visual & Optical Testing
My Level III Self Study Notes Reading 4 Section 4B
My Level III Self Study Notes Reading 4 Section 4B
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6.1 Other Temperature Indicators<br />
In addition to the stick, temperature indicating pellets and liquids are available.<br />
The liquid indicator is brushed on before welding starts and is useful on highly<br />
polished surfaces or for making large marks viewed at a distance. Heat<br />
indicating pellets, about the size and shape of an aspirin, have greater mass<br />
than stick or lacquer marks (see Fig. 64). Pellets are sometimes selected for<br />
use with large, heavy pieces requiring prolonged heating- applications where<br />
stick or lacquer marks could fade with time.<br />
Charlie Chong/ Fion Zhang
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