I am getting ready to do a project using a blend of Pure
Silver, Palladium, Ruthenium,Platinum, and will be using
Hydrogen/Oxy from the torch to do the melt and pour and I will use
an Argon Gas to put a blanket of inert gas over the melt to keep
down the scale and carbon.
Although I have never tried this particular combination, I have
never found oxides of either palladium nor ruthenium to be a
problem. I have only used ruthenium sponge to make 95% platinum
alloy. Oxides have never been a problem for that. Palladium gives up
it's oxides at around 1100F. Silver only oxidizes in ozone. Even if
oxygen was to be a problem, I am puzzled as to how you would "cover"
your melt with argon when a high pressure stream of burning gas is
blowing it right off of the melt. What percentages are you
considering? Perhaps the the silver and platinum will cover the melt
I will be soldering pieces of 22K Green Gold on the cast pieces
an will I need to go back to Butane/Oxy to do that?
Just about any torch will do on this soldering job.
Bruce D. Holmgrain
JA Certified Master Benchjeweler, CAD/CAM Services