[Amps] Pre-heating of tubes

[Will Matney]

Peter,

Check again and see if that isn't degrees F your quoting. I looked this up in a few other books, one it particular because it has a color chart by Tempil who makes the paint sticks for heat treating. The book I'm using is Modern Welding by William and Kevin Bowditch, C 1988. The charts are the same as the chart located at the link below.

By the way, I know Tubal Cain, and I'd venture to say several on here do. He circumscribes his differences with his compasses. If you do know, introduce yourself off the list. : )

For the others, Tubal Caine is a pen name by somebody, I don't know who.

Heat chart;

http://www.zianet.com/ebear/metal/heattreat4.html

Best,

Will

*********** REPLY SEPARATOR  ***********

On 7/30/06 at 12:48 PM Peter Chadwick wrote:

>Will said:
>>Under 300 deg C which is just under where you can't see the anode turn
>red in the dark, is where zirconium will not do any good at all, neither
>for hydrogen or O2 and the others. These heat colors work for any metal,
>but not for graphite. You can check them against any heat treatment or
>metalurgical chart.<
>
>According to my book on heat rreatment (Hardening, Tempering and Heat
>treatment, Tubal Cain, Nexus  Special interests, ISBN 0 85242 837 5) in a
>dim natural light, 700 deg C is dull red, 740 blood red, 800 cherry red,
>825 bright cherry red, 850 red, 900 bright red and 1000 deg C is yellow.
>Not to be confused with the pale straw through dark blue used when
>tempering steel. I would be surprised if 300 deg C can be seen, even in
>the dark - unless maybe, you are a pit viper!
>73
>Peter G3RZP
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