Instructables

Soldering copper to copper?

I'm just starting out but most of the instruction I've seen on soldering (jewelry) talks about flux, the solder itself, and a torch or soldering iron. When soldering copper to copper is there a special flux and solder to be used so that the solder doesn't look "silver"? Does it matter whether you use a torch or a soldering iron?

Pollyyy1 year ago
Copper solder -- genuine copper in copper color -- is available now, from Rings & Things (rings-things.com), Rio Grande (riogrande.com) and probably other sources too.
It melts and flows at hard solder temperatures, so you still need a torch for it (not a soldering iron), but it looks great and is easy to use. The the 93% copper 7% phosphorous copper solder is self fluxing so you don't even need flux!
Mr.Sanchez4 years ago
Some time ago something awesome works for me to weld copper to copper. I Got a ac welder stick...someday when I got no sticks to solder ,I took an old battery and break it gently, find out the coal core and use it like welder stick, and it works with a lot of practice.
beadaholic4 years ago
You don't have to use silver solder with your torch, you can use copper solder. I bought mine from Rawtreasures on ebay. They also have a website with some interesting copper wire (square, half round) that is useful. The copper solder is low temp 1350f. Now if I can solder better that would help!
Yes, the solder is going to be silver (look for lead-free versions). When soldering, I like a liquid flux, this will clean the metal so that the solder flows and bonds properly, but will not change the color of the solder. You can patina the solder with liver of sulfur to darken it;. Whether you use a soldering iron or a torch depends on the type of solder you are using. If you are using a soft silver solder (primarily tin) that melts at low temperatures you can use a soldering iron. I like the Weller100, it maintains a constant 700oF temperature and works well for jewelry-sized projects. If you are using hard solder, whether easy, medium or hard grade, you will need a torch, as you will need to achieve temperatures in the 1200oF-1400oF range. I have been soldering copper to copper making bezel settings for resin use and glass use. I make these with a soldering iron and soft solder (tin).
ebezel3.jpgeelisabeth899.jpgkgreen1.jpg
LinemenOwn4 years ago
If you need to attach 2 pieces of copper together you may want to braze it. The joint will look more goldish then anything but it looks a lot better, and it is stronger.
Solder always looks silver. There ARE treatments that will colour it black. Using a torch or an iron is determined by the size of your job. We use an iron at work for circuit boards - and an oxy-acetlyene torch for soldering BIG copper boxes.