On Friday 20 November 2009, Andy Pugh wrote: >2009/11/20 Leslie Newell <les.new...@fastmail.co.uk>: >> Carbon dioxide is 66% oxygen (CO2). As aluminum is very active it will >> strip oxygen out of the CO2. > >The electronegativity of Al is 1.6, and that of iron is 1.8 (cf 2.5 for > Oxygen) CO2 works perfectly well as a shielding gas for MIG welding of > steel at molten temperatures, I would not anticipate it reacting strongly > with Al at machining temperatures. > >I have MIG welded aluminium with CO2 shielding gas, and it worked >(whilst being demonstrably non-ideal)
My one pass seemed to have left a blackened, (using the 25% co2 supplied commonly in the teeny bottles for outrageous prices) & rather porous looking weld that wasn't any stronger than it looked.. But I'm not a mig expert, don't even play one on tv. :) All I have is a 125 amp farmhand with a mig kit added. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> Why don't you ever enter any CONTESTS, Marvin?? Don't you know your own ZIPCODE? ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
