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Old 06-07-2012, 10:55 PM   #1
s8omobb
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May 2012
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Im gonna go ahead and get 1/2" couplings welded into my keggle instead of weldless. The question I have is does the fitting have to be welded on both sides of the keg wall? The welders I have gotten quotes from have told me that getting under the coupling will not be possible.

 
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Old 06-08-2012, 12:36 AM   #2
Junkster
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I TIG weld mine on the outside of the keg only. If it's a full coupler where you want to thread something in from the inside (pickup tube connector), I make the hole in the keg just a big enough to pass a nipple thru the keg wall and use that to center the coupler for tack welds. Then, remove the nipple and complete the welding around the coupler where it meets the outside of the keg wall. If you purge the back side with argon it will minimize "sugaring". The "sugar" can be cleaned up pretty well with abrasives - I keep those flap discs / wheels separate from those I use on carbon steel to avoid embedding particles which will rust.

Half-couplers only require a hole in the keg large enough to pass whatever is threaded in from the outside like a thermowell or thermometer probe so they're just a wee bit easier.

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Old 06-08-2012, 03:15 AM   #3
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Just weld the outside of the coupling. MAkE SURE THEY PURGE THE BACK SIDE OF THE WELD. If they can't just do a weldless bulk head.
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Old 06-08-2012, 03:29 AM   #4
pfgonzo
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What does it mean to purge the backside?

 
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Old 06-08-2012, 04:35 AM   #5
s8omobb
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Good question!!!

 
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Old 06-08-2012, 04:46 AM   #6
Bobby_M
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Check this article out http://brewhardware.com/weldorweldless
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Old 06-08-2012, 12:56 PM   #7
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When welding you place the coupling through the wall of the keg. Then the welder covers the back side with argon gas. He does this with another line coming from a regulator on his argon tank. Some use a can to contain the gas around the fitting. I just use foil tape to create the pocket. If you have a decent welder, he will know what to do. If not find another welder.
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Old 06-09-2012, 12:54 AM   #8
Dirty
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The argon back flush purges the air out and prevents any contamination from entering the molten steel keeping it sanitary.

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Old 06-09-2012, 01:26 AM   #9
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Quote:
Originally Posted by Dog House Brew View Post
When welding you place the coupling through the wall of the keg. Then the welder covers the back side with argon gas. He does this with another line coming from a regulator on his argon tank. Some use a can to contain the gas around the fitting. I just use foil tape to create the pocket. If you have a decent welder, he will know what to do. If not find another welder.
The preferred method would be to weld the fittings flush to the inside of the vessel.
Check out Junkster's work.

He is not even a welder by trade, but that's what you should be shooting for.
I give him much credit for doing fantastic work.

link to the thread
http://www.homebrewtalk.com/f51/how-...d-look-332934/
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Old 06-09-2012, 03:36 AM   #10
ProzHack
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Am I mistaken... are there two thoughts on this: 1) hole only the size of the close-nipple; 2) hole the size of the entire bulkhead so that the weld is "flush with the inside." I guess I'm just confused about what people mean when they say "fitting."

I'm in the same boat as the OP. I'm drilling soon so I should know what size hole to make. Also, is the weldless hole the same size if you're just sticking the close-nipple through the keg wall?

 
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