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Heat Treating and Metallurgy Discussion of heat treatment and metallurgy in knife making. |
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#1
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Temperature color
Question, do all metals glow the same brightness at the same temperature? Example, is brass the same bright red at 1500F as steel?
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#2
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Try not to think about it as item X color temp but more what color temp is is nothing more than wavelengths of light and how the human eye perceives that.
Copper melts around orangish - yellowish __________________ Gold is for the mistress - silver for the maid Copper for the craftsman cunning in his trade. "Good!" said the Baron, sitting in his hall But steel - cold steel is master of them all. Rudyard Kipling (1865 - 1936) |
#3
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Some never change color. My guess would that different metals would have different colors when at the same heat. Stick a piece of brass and a piece of steel in the ht oven and see what happens. I know brass glows nice.
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#4
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Thanks for the chart
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#5
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I read somewhere that they do, but you would need to research that to really be sure.
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#6
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Very easy test to conduct. Just make sure you reduce your variables to the steel types. Ie- same finish, same geometry, same spot in your heatsource, etc.
__________________ Carl Rechsteiner, Bladesmith Georgia Custom Knifemakers Guild, Charter Member Knifemakers Guild, voting member Registered Master Artist - GA Council for the Arts C Rex Custom Knives Blade Show Table 6-H |
#7
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It's not exact as it depends on alloy, surface condition [finish, oil etc] . You can get temperature crayons especially helpful when you're learning.
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#8
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But some metals don't even change color before they melt.
__________________ J, Saccucci Knives, JSK |
#9
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True, but said metals do not get the opportunity to change colors because they vaporize before reaching a particular temperature color level. Lead would be an example.
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#10
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True true. You got me lol.
__________________ J, Saccucci Knives, JSK |
#11
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Try welding aluminum.
__________________ Carl Rechsteiner, Bladesmith Georgia Custom Knifemakers Guild, Charter Member Knifemakers Guild, voting member Registered Master Artist - GA Council for the Arts C Rex Custom Knives Blade Show Table 6-H |
#12
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I've welded aluminum both with a mig and (believe it or not) just for fun at school we welded some with the oxy/acet torch. Now that is hard! lol.
The hardest thing I have done with aluminum is heat shrinking damaged body panels. __________________ J, Saccucci Knives, JSK |
#13
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Yeah, there's definitely a learning curve with Al. Wouldn't want to try it with a o/a torch, tough enough with a mig. Thing is, there is no color change before a hole appears, nothing like steel.
(Just for those that don't know.) __________________ Carl Rechsteiner, Bladesmith Georgia Custom Knifemakers Guild, Charter Member Knifemakers Guild, voting member Registered Master Artist - GA Council for the Arts C Rex Custom Knives Blade Show Table 6-H |
Tags |
brass, easy, heat, make, metal, steel, surface, welding |
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