File:Pipe Root Weld With HAZ.jpg
A method of checking temperature is by the temper colors: A given temperature will leave a distinct color corresponding to that temperature on a freshly filed surface. (It should be noted that the presence of alloying elements in the steel affects the colors formed, and some of the higher alloy steels have no temper colors.)
This temperature range is very evident in the picture above, at the outside edge of the temper color you can see the transition of all the colors and corresponding temperatures.
Temperature C And Color 204.4 Faint Straw 226 Straw 246.1 Deep Straw 282 Bronze Peacock 590 Full Blue 640 Light Blue
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