ArtMetal

I am not an expert, but I have been making stained glass and copper or steel hummingbirds and butterflys. I use a lead free solder and gel flux from the glass shop. Doing thin metals, the solder joints were strong, but on the thick stuff, it wouldn't hold. I resorted to pre-heating the thick metal with a propane touch and then applying a thin layer of solder. When I attached the wings, I added more flux and solder and it joined strongly with what I had pre-applied. I don't know if the lead free solder will work for electrical connections, but you could try the pre-heat trick. Good luck, Lin