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On Sun, 15 Feb 2004 20:57:48 GMT, Orval Fairbairn
wrote: : :I have used a bandsaw with a smooth blade to friction cut titanium. One :time I had a very small chip catch fire and burn itself out on the :bandsaw table. I think that it takes a lot LESS than 5000 degF to flame :it. That may be true, but I'm trying to figure out how. Ti melts at 3020°F and boils at 5949°F. I'm assuming that solid Ti doesn't burn - it's Ti gas that burns, just like everything else. So, in order to release Ti gas, the solid has to get to 5900 degrees. Even if it's just a little, tiny point on the TI that gets that hot. I've seen white hot Ti sparks coming off a grinding wheel. To be that color, they've got to be up in the 3000 degree range or hotter. I've put an old fashioned gasoline blow torch on a thin piece of Ti and left it there for an hour. It glowed red and got surface discoloration, but it didn't melt or burn through. The hottest point in a blowtorch flame is 21-2200 F BTW, the melting point of 304 stainless is 2590°F. I think if you have a fire hot enough to ignite Ti, your stainless will be long gone - along with the rest of the engine compartment. |
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richard riley wrote:
On Sun, 15 Feb 2004 20:57:48 GMT, Orval Fairbairn wrote: : :I have used a bandsaw with a smooth blade to friction cut titanium. One :time I had a very small chip catch fire and burn itself out on the :bandsaw table. I think that it takes a lot LESS than 5000 degF to flame :it. That may be true, but I'm trying to figure out how. Ti melts at 3020°F and boils at 5949°F. Well, friction cutting does imply that it is hot enough to melt. Might a thin chip get enough concentrated heat to double the temp? |
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