See if you can source some of the proper, " old style " flux and wire containing cadmium.
I talked to some producers at the last Essen welding show about problems such as you describe and they confirmed that cadmium containing products are still made, at least in eurostan, but only supposed...
An engraving tool can work as well ; Dykem both ends and threaten physical violence to anyone who puts any material back in the rack with both marked ends gone!!
On long lengths I would also wrap duct tape around the tube/bar in two places and write the number on it with a magic marker...
I'd second that suggestion, if you decide go the solder route. Here in eurostan, the good silver solders (those containing cadmium) are only commercially available to the aviation industry.:angry:
Why not use a bearing with greater than normal radial clearance, like a C3 or C4, which are common spec bearings in car and bike engines, where you have a interference fit for both races.
Then there's the option to locate the shaft in one ball race and have a parallel roller on the opposite end...
Your post made me search ( as I was curious about how repairs were made on an oil preserved structure ) and I found this ;
Corrosion Protection Method for Welded Steel Tube Structures - Aircraft engineering - Eng-Tips
One advantage of drilling breather holes in TIG welded tube structures for...
If you are using cadmium free silver solder and flux, that could be a problem.
I've found using that crap even on normal type jobs that they are vastly inferior to the old cadmium content products and the flux will form an oxide very easily if the part gets too hot.
gbent's suggestion is good...
Would it be feasible to make a perimeter frame from square steel tubing with diagonals corner to corner and pop rivet the shelves to the frame ?
What temperature are the shelves seeing ?
Have a look through these, there is at least a link to a manual.
Miller aerowave repair, you tube - Google Search
Miller aerowave repair - Google Search
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