Nory wrote:
>
> John wrote:
>
> >I use 75% argon / 25% co2. My Lincoln
> >instruction manual recommends pure
> >co2, no reason given. The welding shop
> >guy says the blend runs cooler. I've been >satisfied, but am curious
> about whether
> >the co2 would be any different/better. My >guess is that the difference
> is not critical. >I'd welcome any other opinions from the
> >list on the matter. John Vallely
>
> When I worked for the local Highway Department, 75% argon / 25% co2 was
> the blend they used for all their welding - not just on the trucks, but
> also on road signs, guard rails, etc. It seemed to be good for any
> welding they did, although I'm afraid I can't tell you what reasons they
> had for chosing that particular blend.
>
> -NORY
>
> Don't assume that because you have found one problem, you have found the
> ONLY problem.
>
> '71 5-speed Midget (my new baby)
> '74 Midget & '71 parts car
> '94 Ford Ranger
> '86 Ford Escort
> '89 Ford Probe
> '96 North American Shepherd
> '94 Tigger Cat/Wheel Chock
> '98 White Cat/Wheel Chock #2 (Lucy Fur)
>
> Car pages and other stuff:
> http://www.geocities.com/SiliconValley/Way/9101
>
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> http://www.angelfire.com/ny/nory
>
> NEW Legal / Law Enforcement Page:
> http://members.tripod.com/~nory
When I did my engineering apprenticeship, as a Toolmaker, we used Argon
Arc welding on the dies and presses, simply because it did not oxidise
the metal. You could machine down the weld, and not have a small
indentation around the edge of the repair. We made presses and pressure
die casting moulds for Vauxhall motor cars, many of the items had to be
able to take chrome plating, ( YES it was MAZAK alloy,) with little
preparation. Argon Arc welding led to the least damage. Oxy/Aceteline
required too much heating, and would 'sink', and ordinary arc welding
far too fierce, and both oxydised at the weld limits.
Neil.
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