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Adjustable, swivel grate with pics

Adjustable, swivel grate with pics

Adjustable, swivel grate with pics

(OP)
I hope the pictures make it.  The prototype is ss304 and some galvanized.  The build with the ribs is ss304, picture 3.

The problem is with the Tee at the base holding the 1/2" threaded rod that supports the upper grate, picture 2.  At the base Tee, the build is 1/2" threaded rod, screwed into a coupling, with the coupling top welded only into a drilled out 1/2" Tee.  With 16 lbs. on the top grate, the downward deflection from front to back is about 1/2 inch.  That is OK.  The problem is, the verical rod is moving/shifting in the base Tee.  I wonder if welding the bottom of the coupling to the Tee, somewhat difficult to do, is a fix or, given time, it will move again.

I could slip a 1/2" thread rod with minor grinding into a 3/8 nipple and weld them together and with a bushing screw that into the Tee.  But welding threaded rod to the nipple, how strong will that be over time?

I am using the threaded, 150#, ss304 pieces as they are generally available and I have friends who want to build, so changing length/widths is easy, different fittings/nipples.

Am I asking for future trouble by welding on this ss304 and exposing it to temps during the cook in excess of 1000 degrees.  I've read about impact of temp on ss304 and chances of cracking etc. Thanks again for any hlep.  

http://img.photobucket.com/albums/v233/tvogds/prototype2.jpg

http://img.photobucket.com/albums/v233/tvogds/verticalrod.jpg

http://img.photobucket.com/albums/v233/tvogds/ribsonswinggrate.jpg

RE: Adjustable, swivel grate with pics

Amatuer
 That's quite a cooker! The only issue with properly made welds of 304 is that these temperatures could cause sensitization, which would cause the welds to lose their corrosion resistance. Use 304L to avoid this.
 The main degradations I would expect over time are warping from thermal stresses and formation of black oxide.

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