Not logged inAmerican Welding Society Forum
Forum AWS Website Help Search Login
Up Topic Welding Industry / Processes / Help with brazing copper art projects.
- - By LaneG Date 03-09-2005 04:50
Hello

I know the information I seek is out there somewhere, the trick is finding it, hopefully someone on this forum can help me.

I have a hobby/business where I make things out of copper. I have a web site at www.copperaccents.com where you can see the type of stuff I make. I have a problem that I haven't been able to find an answer for. I started out using soft solder, then went to a silver solder for my joints. But they weren't holding up. I then was told by my local welding store to try a sil-phos product. The joints are strong now, but I hate all the clean up work afterwards. I don’t use plumbers fittings, as they are ugly. What I do is butt joints, so there isn’t very much in the way of surface area for the solder/braze to grip. The JW Harris sil-phos product I use is Dynaflow, and flow it does, all over the place, but I do get very good strong joints. I then have to use a die grinder with a coarse scotch bright pad to burnish away all the dynaflow to get it back to copper color again. The only place the brazing material needs to be is in the butt joint, and not all around it and be visible. When I’m done with the scotch bright then the copper pipe isn't shiny anymore. If I have a customer who wants their item shiny, it is awfully labor intensive. Usually they want the item with a copper patina, then I don't worry about it so much. In that case I very often even sandblast the item to get rid of the extra brazing material There is another company, GI Designs, at http://www.gidesigns.net/garden_structures.html where you'll see that they sell a lot of items that look very shiny. I know that they braze or solder their joints because I asked them. What I need to learn is how to braze/solder a good strong joint and not have all the mess to deal with. Can some one PLEASE help?

I'd be sincerely thankful.

Lne Gustafson
Copper Accents
http://www.copperaccents.com
Parent - By billvanderhoof (****) Date 03-09-2005 07:02
There are materials for soldering (solder resist or anti-flux) that keep the solder away from areas where you don't want it. There may be similar materials for your filler. The manufacturer of the filler would be the best place to find out.

Ultimately I bet the process you would like best is tig welding. The filler would be copper so there would be no color mismatch at the joint.
Bill
Parent - - By Lawrence (*****) Date 03-09-2005 12:57



The stuff Bill mentioned is called "Stop Off" you can apply it with a brush or squeese tube and braze will not flow where you put it. It is formulated to clean up easily.

There are a variety of Stop Off compounds so you will need advice as to which is best for your copper, but I bet it will solve your problem.

Here are a couple examples
http://www.omnibraze.com/stop_off.html

http://www.aimtek.com/html/brazing_alloys.html
Parent - By LaneG Date 03-09-2005 18:00
I thank you for the suggestions, and I’ll keep them in mind. However I'm thinking isn't this like corralling the cows after someone left the gate open. I don't want to open the gate. Is there a product, method, or process that would keep the braze/solder material where it should be without building a dam around the area with "stop off". This process of painting something around every joint would be time consuming and labor intensive in it's own right. Or am I dreaming,… again…. <grin>

Thanks
Lane
Up Topic Welding Industry / Processes / Help with brazing copper art projects.

Powered by mwForum 2.29.2 © 1999-2013 Markus Wichitill