Alternative to soldering?? Cold bonding??? Bookmark and Share

Alternative to soldering?? Cold bonding???

Postby 2ba4t » Wed Aug 28, 2019 2:55 pm

Are Superpro copper glue - Just for Copper: any good for us??

Various cold copper bonding ‘glues’ seems to have been around for decades. If they are so good we should all have abandoned soldering. I can understand the natural conservatism of professionals and fear of leaks and consequences. Most reactions seem to be, ‘What was wrong with the old methods?’ ‘Would not touch it with a barge pole’ ‘Bound to leak eventually’. It may be no good for high pressure uses or refrigeration and specialised chemical applications – but tubas?
Torching around valves and on lacquer is a pain and the acrobatics of wiring up a series of joints in close proximity and getting them all to melt and bond simultaneously can be a nightmare. Just carefully cleaning and then glueing with this magic stuff seems very attractive. [These amateurs!!!! :oops: ]
Anyone tried this? Why do we not all use it? Any experience please?? [You can answer anonymously if it is unprofessional to admit using this stuff :mrgreen:]
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Re: Alternative to soldering?? Cold bonding???

Postby roweenie » Wed Aug 28, 2019 3:11 pm

I've never heard of this method. How does one "undo" the bonds made this way? Heat, chemicals, or otherwise?

Actually, "soft" soldering (with flux and lead/tin solder) is not that difficult, once you get the hang of it.
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Re: Alternative to soldering?? Cold bonding???

Postby bloke » Wed Aug 28, 2019 8:07 pm

If someone had an instrument with a leak in a slide joint in one little spot, didn’t want to burn the lacquer, didn’t want to mess up the silver or gold plating, and just wanted to stop the leak, I don’t see what the heck would be wrong with putting a drop of super glue down into the little leaking spot – particularly if there is a lime or some other contaminant in there that would make it a really involved solder joint to repair.
After all, what is most important: the method, or the results ?
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Re: Alternative to soldering?? Cold bonding???

Postby Big Toot » Thu Aug 29, 2019 9:20 am

bloke wrote:If someone had an instrument with a leak in a slide joint in one little spot, didn’t want to burn the lacquer, didn’t want to mess up the silver or gold plating, and just wanted to stop the leak, I don’t see what the heck would be wrong with putting a drop of super glue down into the little leaking spot – particularly if there is a lime or some other contaminant in there that would make it a really involved solder joint to repair.
After all, what is most important: the method, or the results ?


Not that my opinion is worth the bytes that it's typed with, but I wouldn't see anything wrong with that, all things being equal.
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Re: Alternative to soldering?? Cold bonding???

Postby 2ba4t » Thu Aug 29, 2019 12:04 pm

I think it is a great idea if it works permanently. I would hate to have the player end up with several bits of tuba. Anyone used this brand - Just for Copper?? It should revolutionise tech work http://justforcopper.co.uk/" target="_blank
The site is like Hamlet's mum - it claims too much - but if it is true ....
also see https://www.amazon.com/Copper-JFC050-Ou ... B000VHYRGA" target="_blank and https://www.doityourself.com/forum/plum ... -instead-s" target="_blank.

I think that on a lacquered bass or with lots of close bends and joints needing soldering simultaneously it should be a dream. It is easily undone by applying heat from a torch apparently - so with lacquer you get only one bite.

I'll experiment.
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Re: Alternative to soldering?? Cold bonding???

Postby bloke » Thu Aug 29, 2019 2:15 pm

If a tiny crack (leak) in a critical (pretty-on-the-outside / dirty-on-the-inside) solder joint, why not...
- apply super glue to the crack/leak
- plug up one end
- suck on the other end
- wait 20 minutes
- test
??

...so - besides lacquer stripper and lye - are solder and flux also banned?
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Re: Alternative to soldering?? Cold bonding???

Postby Stryk » Thu Aug 29, 2019 8:12 pm

bloke wrote:If someone had an instrument with a leak in a slide joint in one little spot, didn’t want to burn the lacquer, didn’t want to mess up the silver or gold plating, and just wanted to stop the leak, I don’t see what the heck would be wrong with putting a drop of super glue down into the little leaking spot – particularly if there is a lime or some other contaminant in there that would make it a really involved solder joint to repair.
After all, what is most important: the method, or the results ?


I've used it on many school horns - especially when my budget was gone. It's best on plastic, but several brass instruments in my old bandroom have super glued parts. Doctors use it instead of stitches after surgery now, so if it's good enough for us.....
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Re: Alternative to soldering?? Cold bonding???

Postby The Big Ben » Fri Aug 30, 2019 12:06 am

If it is a crack or hole and doesn't need to gain strength, what's wrong with a small piece of electrician's tape? No glue cleanup before soldering.
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