I don't know if it's applicable here, but I have heard that stainless is
   welded, the back side of the weld needs to be in an O2 purged
   environment.  I wonder if/how that's done when the inside of the pipe is
   being welded to a flange..


   Matt-

   That is true for tube butt joints such as headers. You need a
   separate supply of nitrogen gas behind the weld. Not so for a
   flange welded on the end of a tube as the slag, if any, can be
   mechanically removed.

   Paul Lamar ...No rotor no motor

Paul,
Let's hope that Matt mistyped O2 for N2! Oxygen wouldn't be used in
almost any weld process other than flame cutting.
Bill Jepson

Thanks Bill. I missed that.

Paul Lamar ...No rotor no motor.

The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Copyright 1998-2006 All world wide rights reserved.