On Sun, 13 Jun 2004 21:13:44 +0100, "PR"
wrote:

"Gunner" wrote in message ...
Im curious though..when welding on a chunk of mystery steel (likely
12L something) I was getting a brown layer of soot on the work area.
What is it? What was causing it? I recall something about that in a
post before..but cannot find the reference.

This one?
http://groups.google.com/groups?selm...bk%404 ax.com
"If you are welding hot rolled metals/A36 (like angle iron) and do not
remove mill scale there is a substance which looks like rust where the
parent and weld metals join. The shielding gas will also sometimes a
brownish dust around the weld."


Ayup..the brownish dust thingy. Thanks!

Gunner

That rifle hanging on the wall of the working-class flat or labourer's
cottage is the symbol of democracy. It is our job to see that it stays
there.
- George Orwell