I mostly use TIG, one can just melt material in an area and NOT have to be adding filler. Mig will work, penetration can be a problem and new filler material will ALWAYS be being added while you have an arc. BE SURE to get the appropriate filler material if you use tig (ie if welding Everdure, get everdure wire). If the parts have a good fit, with tig, the weld can be made with NO filler, not so if using Mig.

Good luck.

John Dach

Stephen Fitz-Gerald
You can MIG weld SILICON BRONZE and it works well.
You must use silicon bronze wire though (a bit expensive).
I'm using straight argon (I think) for my shielding gas.
This set up means there'll be no discoloration of the seams after cleanup because the weldment is the same material as the welding wire,and of course any patina will be homogeneous throughout.
It takes just a bit of getting used to because it's not quite as smooth as welding steel,by this I mean adjusting your machine PRECISELY is just a bit more important...Burnback seems to be a little more prevalent.

Yes, you can use MIG - or TIG, or oxy/acetylene, if you wish. It is important that whatever process you use, your filler material must be the same alloy as the parent metal. If it is not, you will not only have a poor color match, you may experience other problems as well.

The most "user friendly" bronze for welding is high silicon bronze, alloy C65500, also called "Everdur" by many people. This bronze is generally 97% copper and 3% silicon, though there may be traces of other tramp elements present.

When welding bronze, you should be aware that, as a copper alloy, it has high thermal conductivity so it takes extra heat to initiate a weld puddle. Once the puddle is initiated however, you can back off on the heat somewhat to maintain good control of the weld puddle. Like most copper alloys, bronze has a narrow differential between the fluidus and solidus temperatures so you have to be careful not to melt it into a puddle.