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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When the rated temperature is reached, the stick leaves a liquid<br />
streak instead of a dry mark and welding can begin.<br />
To ensure accurate temperature indication with no override,<br />
two or more indicators can be used to alert the operator<br />
that the test object is approaching the correct temperature.<br />
When a range of recommended preheat temperatures is<br />
given, use of several indicators might be appropriate. For<br />
example, carbon-molybdenum steel should he preheated to<br />
between 95 and 205 °C (between 200 and 400 °F). A bundle<br />
of indicators with ratings at 95, 120, 150, 175 and 205 °C<br />
(200, 250, 300, 350 and 400 °F) might be useful for<br />
determining how much of the test object is within the preheat<br />
temperature range.<br />
Charlie Chong/ Fion Zhang
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