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Tool Talk Discussion Forum

Plasma cutting

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Chuck in TX

05-12-2006 08:07:51




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I have had a plasma cutter on my short list for awhile. Just ran into a situation where a friend was making pieces from 3/8 steel, and had them cut by plasma including some 3/4 inch holes. He then milled out the holes for a precision fit, but found that the plasma cut holes had hardened so much that he was breaking milling tools. He ended up drilling and milling to get the job done. This left me with several questions for you guys.
1. Is the hardening as noticeable on thinner metal, say 1/8 inch for instance?
2. Does Oxy/ace do the same thing, maybe to a lessor degree?
3. Is there a good way to work around or minimize the hardening?

Thanks for your wisdom.

Chuck

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mjbrown

05-12-2006 18:14:03




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 Re: Plasma cutting in reply to Chuck in TX, 05-12-2006 08:07:51  
Cutting with oxy/act. can harden the steel especially if you dunk it in water to cool it. The slag is very hard. It makes a difference what the carbon content of the steel is also.
I think the plasma cutter would harden less of the steel since it does not preheat the way oxy cutting does.



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