Re: [AMC-list] AMC-list Digest, Vol 12, Issue 72

[tom jennings <tomj@xxxxxxx>]

On Thu, Mar 25, 2010 at 6:29 AM, Peter Marano <pmarano@xxxxxxxxx> wrote:


> Using an ELECTRIC vac this way is inviting disaster, the motor is not
> sealed to prevent gas fumes from entering.  Tom used his to ventilate the
> tank, not evacuate the tank. Sparks from the motor could ignite the vapors.
>

Shop vac on BLOW, not SUCK. Even the world's most comically worn out brushes
in the motor couldn't fill the entire length of the hose with hot sparks!



> The argon sheilds the back side of the weld.
>

Not needed; the metal's not liquid/vapor on that side unless you arc
through. And that's a lot of expensive argon!



The human nose is exquisitely sensitive; if you can't smell gas, it ain't
there. There's also minimum concentrations necessary to even combust. This
problem is being over-thought.
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