On 13/10/16 02:20, Don Foreman wrote:
On Fri, 30 Sep 2016 21:26:17 -0700, Gunner Asch
wrote:

On Fri, 30 Sep 2016 20:42:39 -0500, Tim Wescott
wrote:

On Fri, 30 Sep 2016 13:57:04 -0500, Jon Elson wrote:

wrote:

So, after looking at tubular reviews I decided the TIG 200 was a
good buy.
Tried it out last night for the first time. Just on 120 volts. I
was able to weld .125 thick 6061 using 3/32 filler rod with no
problems.

That's very impressive! It took me a while to get the feel of doing
Aluminum. First problem is nobody told me the work NEVER got hot enough
to glow. Once I realized that bit of info from steel welding would not
be available, things went a bit better. I have a square wave TIG 300,
which is a fantastic machine, but large and heavy.

Gas lenses help reduce gas consumption, and Argon is getting pretty
pricey.

Jon
If I'm not mistaken, it's not that the work won't get hot enough to glow,
it's that aluminum is never emissive enough in the visible wavelengths
for it to glow. If you watch aluminum casting, you'll see that the
crucible is glowing a dull red, even though the aluminum inside is
shiny. If the aluminum were "black" (meaning, if it were emissive), it'd
be glowing that same dull red.
https://www.tinmantech.com/products/...lding-lens.php

The Tinman's lens is for cutting the yellow sodium flare from flux
when gas-welding aluminum. That flare completely obscures vision of
the weld zone. The TM2000 lens completely blocks that yellow flare,
greatly facilitating gas welding of aluminum.

I've seen this sodium flare issue mentioned many times but have never
actually experienced it when gas welding aluminium and using a standard
gas welding filter as used for OA welding of steel. Maybe the flux
formulation i have used in the UK differs from that in the US and it
doesn't produce the flare or maybe it's a problem when gas welding
aluminum but not aluminium as we have in the UK .


Years ago weldors used cobalt blue lenses to block that sodium flare.
They didn't work as well at blocking the sodium flare. I can attest
to that; they were better than nothing, but not nearly as effective as
the green TM2000 lenses. More importantly, they did not adequately
protect the weldor from UV and IR rays. They are no longer used or
available.



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