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Registered Member #2123
Joined: Sat May 16 2009, 03:10AM
Location: Bend, Oregon
Posts: 312
I did not think this was practical, but there are several articles describing how it's done, gee whiz.
I would be suspicious of how reliable a copper to stainless weld would be, would electrogalvanic action cause the weld to corrode away in the presence of water, how would each metal affect the grain structure of the other, would there be embrittlement, etc.
I would still strongly advise the use of silver solder, since that is what I've used in the past.
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Harry -
Perhaps a slight nomenclature issue ...
In the US, (at least years ago when I received my training) "welding" was generally understood to be a process involving fusion of the parent metal. Brazing, soldering, etc were processes involving addition of a lower melting point filler metal, with no fusion of the parent material.
You're absolutely correct, TIG and MIG processes CAN be used to "join" stainless steel and copper alloys IF a third filler alloy is used.
As far as a joining process that is easily carried out in a home workshop, silver brazing is ideal. Higher silver content brazing alloys are very fluid, and its very easy to make good-looking, high-strength joints without requiring an expensive TIG or MIG system, shielding gas, exotic electrode material, etc.
Registered Member #1837
Joined: Tue Dec 02 2008, 02:20PM
Location: NYC
Posts: 65
Thanks for all the help although I guess i could also be more clear about what I'm up to. I want to attach a copper handle to a stainless cup. It will be 1/2" copper pipe (plumbing pipe) made into a mug handle and a polished 18/10 stainless cup. It really will not need to be fused metals, just strong enough to not break off if dropped or handled as a drinking mug would be.
I can't really find any info on what would be suitable. I was hoping i could braze or solder them together but I have not seen a product that can do this. I will look further into silver solder. I'm even thinking some sort of glue/adhesive.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
There's always rivets and even nuts and bolts if you seal them well. Might look quite stylish with the right nut heads, a break from the Alessi two-tone metal style which is done with spot welding, and plated parts.
Registered Member #1837
Joined: Tue Dec 02 2008, 02:20PM
Location: NYC
Posts: 65
Adrenaline, This is the route I originally wanted to go. I am worried the joint would not be strong enough. Do you think I would have enough strength to solder a handle on to a mug? It would weigh 2-3 pounds when complete and full! I worry that the polished stainless will not have any ridges for the solder to grip. I've never tried anything like it though and if you think it'll work I'll give it a shot. Dennis
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Soldering/welding copper to stainless steel
