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Aldo, helium is helium. Helium is used in welding by blowing it around the weld so that the material being welded can not get any oxygen , so does not oxidize. That is what gives that clean melted metal look to good aluminum welding. Argon is actually better, as it is a heavier gas and easier to keep on the weld. Acetylene welding uses a mixing device which burns the gas as it is combined with oxygen in a torch tip ( tell those guys about "oxygen cleaning" ). Welding oxygen could conceivably get acetylene pushed back into the tank, but then the fact is that acetylene acts like an inert gas for diving smells horrible , and if it does not blow up then, well you'll be able to tell by the buzz. The suppliers keep the welding, aviator, and medical bottles separate and the fill them as categories, generally vacuuming the welding bottles once, aviators twice, medical three times. There is nothing else in the gas. Use it and have fun. ----- Original Message ----- From: Aldo P. Solari [APS] <aldo.solari@ho*.se*> To: George "Trey" Irvine <trey@ne*.co*> Sent: Saturday, September 30, 2000 9:41 PM Subject: helium > Trey, can you clarify whether you use welding helium for your gas > mixes ? > > Here (Canary islands) we dont have "medical grade" helium but > there is helium for welding ... > > Do you have some specific filters to transvase welding helium to > your triox mixes ? > > As a matter of fact, if this welding heliums could be used for > diving, it would open a new window here in Canary Islands. > > cheers, > > aldo > > > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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