Re: Silicon bronze sheet?
Muntz metal is a trade name, not an alloy name- so it can vary a bit from mill to mill, but generally its either
C365, which is 60% copper, .6 % lead, and 39.4% zinc
C370, which is called "free machining" muntz, which is 60% copper, 1% lead, and 39% zinc.
Either way, its hell to weld.
The zinc and lead boil off, bubble, and release toxic fumes.
Best way to weld it is to tig weld with a silicon bronze filler rod- you wont get a great color match, and there will still be some porosity in the weld, but it will stick, structurally. You may be able to gas braze it with flux- never tried it, but it might work. Again, get it too hot, and the lead and zinc will drive you nuts.
It was never designed to be a weldable alloy- its for cold forming and machining. Maybe a bit of hot forming, at relatively low temps in big presses.
It is used for condensor tubes, screw machine parts, and other stuff that is mostly machined.
Got in Trouble for that.