Jerry Hey wrote:

Paul,  I want to drop a 2.25inch  o.d. section of tube into the S-beam
to allow direct air flow into the cool tube. The tube i.d should allow
a piece of 2" scat to run through it.   I think if this is done
properly, the  s-beam's integrity will be enhanced, certainly not
weakened in any way.  By properly, I mean the hole cut in the S-beam
would provide a tight fit around the tube, the tube would be either
4130 or 304 SS.  It would be Tig'd into the s beam. I will build a
prototype so we can prove its strength.      Your thoughts?    Jerry

That would probably be OK. Max stress on the beam is in by the mounting
bolts. I would stick to 4130. No telling what can of 
worms you might get into by welding stainless to 4130.

Paul Lamar
 
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