[TheForge] welding heat

Fri Aug 1 09:32:00 2003

Hey Bob,
My  Didymium/gold face shield  is equivalent to a 3.5 shade welding filter.
I need at least a #5 standard welding  filter to be able to forge weld for
long periods of time.
 When I turn away from the fire with my hands holding the billet. I can see
in my shop with the Didymium/gold face shield, but with a welding shade I'm
essentially blind until I can put down the billet and lift the shield

The #5 doesn't reduce sodium flare or block the heat waves from the IR so I
can't see the billet as well as with the Didymium/gold face shield.

Other than these differences, the shields are equivalent.

I suggest you try a Didymium/gold face shield  and see for yourself.
Chuck
----- Original Message -----
From: "Bob Rackers" <[email protected]>
To: <[email protected]>
Sent: Thursday, July 31, 2003 9:31 PM
Subject: RE: [TheForge] welding heat

> Welder's shades work as well.
>
> Bob
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Chuck Robinson
> Sent: Thursday, July 31, 2003 8:28 PM
> To: [email protected]
> Subject: Re: [TheForge] welding heat
>
>
> Hey Folks,
> At the risk of incurring the wrath of the fluxless weld crowd again,
> I find it a big help to use my Didymium/gold face shield when forge
welding.
> Didymium doesn't filter UVA and UVB or IR.
> It is effective only for filtering out sodium (Yellow) flair, caused by
the
> borax flux: But the Gold filters out everything else without darkening
your
> whole field of vision.
> When making damascus, since it filters the IR, you can see any dark
shadows
> that indicate weld flaws, and you can really see the flux dancing on the
> billet when you reach welding temperature. It is Like having x-ray vision.
> The gold blocks the IR so effectively that you can stick your face way too
> close to the forge and not feel any heat behind the shield. Of course at
> this point any unprotected areas of your body will be reaching flash
point.
> The only other cautions I have are, that there is a color shift in the
color
> temperatures you have to get used to, and the gold surface of the shield
is
> fragile.
> One other point, the forge welding temperature is inversely proportional
to
> the carbon content of the steel in simple carbon steels.
> The higher the carbon content the lower the welding temperature.
> Chuck
>
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