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Old 01-28-2011, 06:07 PM   #471
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So that'll solder a SS nut TO Aluminum. Cool. Thanks.
That's what it looks like to me, but it should be noted that I haven't done this myself.
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Old 01-28-2011, 06:07 PM   #472
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It is going to be a whole lot easier to get an aluminum fitting and go AL to AL.

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Old 01-28-2011, 06:11 PM   #473
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No when I have the SS fittings already in front of me Plus, the SS locknut is $4 cheaper than the Aluminum.

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Old 01-28-2011, 06:14 PM   #474
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I hope that the difference in heat expansion rates between the AL and SS aren't enough to cause the solder joint to fail, but that's probably unfounded speculation.

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Old 01-28-2011, 06:36 PM   #475
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I hope that the difference in heat expansion rates between the AL and SS aren't enough to cause the solder joint to fail, but that's probably unfounded speculation.
That's a good point I was thinking this myself different thermal expansion rates.

If I needed to go the weldless route I would of used a thicker washer then machined a groove to capture or retain the "O" ring allowing the proper amount of preload crush of the "O" ring plus before seating the washer solid against the keg with the nut. Talking 40 ft/lbs torque for a solid fitting without fear of ball valves wobbling around spitting out "O" rings. JMO's.
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Old 01-29-2011, 11:37 AM   #476
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Not an expert, but what if you put the solder on the aluminum then placed the nut on the solder then heated the nut? I think that would negate some of the expansion differences.

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Old 02-01-2011, 03:03 PM   #477
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When soldering an element locknut, is it heavy enough to not float around like a hockey puck? The only other Silver Solder I've done to date was a grounding lug which skated all over the place.

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Old 02-01-2011, 03:39 PM   #478
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When soldering an element locknut, is it heavy enough to not float around like a hockey puck? The only other Silver Solder I've done to date was a grounding lug which skated all over the place.
what seems to be the best for lock nuts is. coil a piece of solder the same diameter as the lock nut and place that on the vessel, use your liquid flux, set the nut on top of the solder and heat even around the outside of the nut until solder melts.

is that the method you used when the nut was skating around on you?

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Old 02-01-2011, 03:41 PM   #479
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When soldering an element locknut, is it heavy enough to not float around like a hockey puck? The only other Silver Solder I've done to date was a grounding lug which skated all over the place.
I'd use a pair of vice grips or the like to hold it in place.
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Old 02-01-2011, 04:02 PM   #480
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is that the method you used when the nut was skating around on you?

-=Jason=-
No, it was just a tiny Copper ground lug which I fluxed and then flowed the solder around it. That little thing just started sliding all over the place.
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