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Home Brew Forums > Home Brewing Beer > DIY Projects > Kettles, Mash Tuns, & Hot Liquor Tanks > Silver soldering fail - How to recover?
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Old 11-16-2013, 03:04 AM   #1
jasonbickford
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Default Silver soldering fail - How to recover?

My brew partner and I decided to silver solder our kegs. The first joint came out horrible... Its got a lot of big blobs of solder and there is kind of a small "cavity" in it. We haven't water tested it to see if its water tight yet. The rest (we did 8 total) turned out really nice and all look great.

I think we didn't use enough flux, and overheated the coupling instead of the general area.

Does anybody have any experience trying to "re-do" a silver solder coupling joint?

I'm wondering if I can get the solder flowing, try to wick it away or suck it out, sand everything, re-flux, and re-solder.

Thanks guys!

image.jpg   silver-solder-joint-1.jpg  
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Old 11-16-2013, 03:14 AM   #2
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For sure you can do it again. Heat it up, remove the part, clean all of the residue off of the part and the keg, and do it again. Take the time to clean both keg and part really well before you try it again

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Old 11-16-2013, 04:41 AM   #3
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Default solder

Just a guess but did you use the correct flux?

I also heated up the fitting not the keg when I did mine and it came out fine.

You can definitely start over once everything is clean.

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Old 11-16-2013, 08:48 AM   #4
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Use a heavy grit sand paper to give the solder a place to stick.

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Old 11-16-2013, 09:44 PM   #5
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Re-solder! It's a lot easier to deal with than a bad weld!

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Old 11-17-2013, 02:59 AM   #6
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Thanks I think I'll give it a try.

Any advice on how to get the fitting out of the bulkhead? Its held in by the dimple really snug and I wonder if I'll have trouble getting it out once the solder is fluid.

Thanks!

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Old 11-17-2013, 03:03 AM   #7
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I had to get one out too. Have your dimple tool all ready to back the fitting out, heat the fitting as you normally would-letting the solder liquefy, back it out while hot. It worked for me. Good luck!

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Old 11-17-2013, 03:31 AM   #8
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You could try cleaning all around the joint then while heating it to liquefy the solder brush more flux on with an acid brush soaked in flux. That worked for me when I had a spot on my attempt at soldering stainless didn't take to well. It also works all the time for me when sweating copper pipes that have issues sucking the solder in.

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Old 11-17-2013, 02:23 PM   #9
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If the fitting is still in the keg dipple, I would suggest heating till the solder flows and then use a small stainless brush to clean the joint off.

This will get rid of the excess solder and any oxidized material on the surface.

Then just apply new flux, heat, and reflow the joint with solder.

Laying the keg so the fitting is horizontal will allow gravity to work for you by helping to carry the solder away from the joint.

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How hard can it be?

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Old 11-17-2013, 03:13 PM   #10
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Another easy way to desolder is to heat until it's liquid then drop the keg from a height of 4 inches onto a concrete floor.

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