On 11/20/2009 02:14 PM, Gene Heskett wrote:
> On Friday 20 November 2009, Andy Pugh wrote:
>> 2009/11/20 Leslie Newell<[email protected]>:
>>> 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.
>
In my experience, the only gas that should be used on aluminum is
argon. I use argon for all of my welding needs, I have one bottle for
my TIG/Stick welder, and another for my MIG welder.
If you are going to go through all of the trouble of using a
shielding gas, a good non-reactive gas would be better than CO2, and
depending on where you live, argon should be easier to find than nitrogen.
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