[TheForge] last project

Thu Jun 5 02:47:01 2003

Okies good answer, must of my TIG work on stainless finds its way to Wafer
fabs (silicon computer chips) so it never see's the weather.

----- Original Message -----
From: "RIES NIEMI" <[email protected]>
To: <[email protected]>
Sent: Wednesday, June 04, 2003 10:01 PM
Subject: Re: [TheForge] last project

> on 6/4/03 6:12 PM, Paul Hewitt at [email protected] wrote:
>
> > Just curious but you actually spend the time to EP the welds, I just
take a
> > small stainless wire brush and brush them hot as soon as I am done
welding,
> > takes the color right off.
>
> I have found that even though the ss wire brush makes the weld look clean,
> in time, particularly outside, the welds still discolor. The heat affected
> zone has the chromium burned off, or recombined, or something, and so
unless
> you etch it back down to pure ss, it will turn kinda purpley brown for a
> little ways around the weld. Of course, this depends on the size of the
> stock and the amount of heat you put in it.
> I have a bridge I built last year, 40 feet long and 12 feet tall, imagine
a
> covered bridge, but the cover is a skeletal salmon made from 3/8" round.
> Because it was so big, we couldnt electropolish it, and I didnt have the
> little mini polisher then, so we just wire brushed it. It looked great for
a
> month, but now, a year later, every weld looks kinda dirty. Not blue and
> purple anymore, just discolored.
>
> I have an electropolish tank, my friend owns a
> > buisness and he mixes up his favorite concoction of acid and sends it
down
> > to me and says add X amount of water, his process is supposedly so
secret we
> > only get MSDS sheets I have no idea what is in it, but its BAD LOL.  He
does
> > hold a patent, and I do know his stuff works better than any other I
have
> > tried, plus I don't have to deal with the garbage I simply take it to
him
> > end of story he runs it through the reclaimer and that's it.
>
> Wish I had someone like that- although mostly I design things to fit in
the
> tank, or components that fit in the tank and are site welded together with
> the minimum amount of connections.
>
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