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  #11  
Old 06-14-2008, 08:29 PM
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journyman journyman is offline
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Some Creep, I don't know the meg reading on the DI at the brewery as I worked for a local piping contractor to replace the pipe. The determinations were made long before I was on the job.
I have used 18 meg water as a solvent when I worked for a tank shop (PEI) fabricating cryogenic ultapure tanks for the electronics industry. We also used 18 meg water as a testing medium to determine cleanliness for purity.
SS is a very broad term and includes 304 through the exotics, and I'm sure many more grades than I can imagine. Specificly I am refering to 304 being replaced with AL6xN.
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  #12  
Old 06-15-2008, 07:41 AM
Don_S Don_S is offline
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According to one of my TIG books 308 or 347 are reccomended for your likely combination of metals. 308 is common. I was suprised that 309 was not.
If your 300 series alloy is 316 then there wasn't a reccomendation but most likely in industry you are not likely to weld 316 to a 400 series as you are getting on opposite ends of the corrosion chart.

filler | alloys used on
308 | 201, 202, 301, 302, 304, 305, 405, 409, 410, 430
309 | 309, 442, 201, 202, 301, 302, 304, 305
347 | 347, 301, 302, 304, 304l, 308, 321, 403, 405, 409, 410, 430, 501, 502

This is just info out of one book. Generally 309 is considered to be one of the more universal ss rods.

Don
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  #13  
Old 06-15-2008, 08:51 PM
markct markct is offline
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thanks for all the advice guys, i guess its ok what im doing, like i said this is all salvage stainless so no idea of the alloy, other than weather its 300 or 400 by the magnet test. like i said the first stuff i tigged i didnt even know one part was 400 and one was 300, it was a soda keg section to some sheetmetal from a freezer, to make a roof jack, it welded well and the welds are not rusting so i guess for my needs 309 should be ok
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