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Old 09-26-2010, 05:16 PM   #1
tasq
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Mar 2010
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Hi Gang,

Need some help here.

I recently had a buddy weld some couplings on my keggles. He used stainless wire, back gassed, and used 100% Argon. They are welded from the outside only.

I have scrubbed the welds 3 times, with barkeepers friend paste and a green scrubbie pad. Each time the rust returns.

Is it possible the metal just needs more time to passivate, or are these going to be a lost cause?

Any input will be greatly appreciated.






 
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Old 09-26-2010, 07:52 PM   #2
lincoln
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Quote:
Originally Posted by tasq View Post
He used stainless wire,
this tells me it was mig and not tig, it also looks like mig (not the best but can ve made to work) the inside don not look like it was purged. the last photo on the right looks like a cold start.

to fix it i would grind the dark stuff from the inside, and try to passivate with bkf or if you have a plating house around you they will have nitric acid...



 
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Old 09-27-2010, 12:34 AM   #3
tasq
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Quote:
Originally Posted by lincoln View Post
this tells me it was mig and not tig, it also looks like mig (not the best but can ve made to work) the inside don not look like it was purged. the last photo on the right looks like a cold start.

to fix it i would grind the dark stuff from the inside, and try to passivate with bkf or if you have a plating house around you they will have nitric acid...
Many thanks for your reply! I'll try your suggestions and post back if I am still having issues.

 
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Old 09-30-2010, 05:54 PM   #4
stinkiestbink
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In my TIG welding days, a STAINLESS wire brush was the best to clean up the welds while they were still hot. Definitely stay away from a carbon wire brush. That will cause rust.
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Old 09-30-2010, 05:57 PM   #5
tasq
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Quote:
Originally Posted by stinkiestbink View Post
In my TIG welding days, a STAINLESS wire brush was the best to clean up the welds while they were still hot. Definitely stay away from a carbon wire brush. That will cause rust.
The guy who welded these for me is coming over tonight with a new stainless wire wheel. We are gonna hook it up to an air drill and go to town on them. I then plan to clean well with barkeepers friend.

Do you think a stronger solution of nitric acid might be necessary? WonderGel?

 
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Old 09-30-2010, 06:07 PM   #6
stinkiestbink
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Sorry bro, I have never used any chemical to shine stainless.
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Primary: Cabernet Sauvignon box kit
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Kegged: Red Snow blower Peated Porter II, All Homegrown Cascade IPA
Bottled: Braggot Experiment, CLIPA (Closet IPA), Vanilla Brown, Oktoberfest Honey Wheat #1&2, Bleeding Brain Belgian, Pale Ale kit, Amber Ale Kit, Porter, Blueberry Mead 2007, Apfelwein 2007, Pear Mead 2008, Rasberry Wine 2009
http://sites.google.com/site/whiteoakhillweather/fermentation

 
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Old 09-30-2010, 06:08 PM   #7
tasq
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Quote:
Originally Posted by stinkiestbink View Post
Sorry bro, I have never used any chemical to shine stainless.
Not a problem, hopefully someone else can chime in.

 
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Old 09-30-2010, 06:32 PM   #8
Sizz
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Following the keg polishing threads, I used gator grid pads to clean out the welds. "Bar Keeper's Friend" brand cleaner afterwards to clean & passivate.

 
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Old 09-30-2010, 06:37 PM   #9
tasq
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Quote:
Originally Posted by Sizz View Post
Following the keg polishing threads, I used gator grid pads to clean out the welds. "Bar Keeper's Friend" brand cleaner afterwards to clean & passivate.
Thanks Sizz, I'll def try the gator pads if the SS wire wheel doesn't work out.

 
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Old 09-30-2010, 09:44 PM   #10
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unfortunately it this don't work you will have to grind it out and start over. the rainbow is not to bad but the black blobs are sugaring.



 
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