- Thread starter nikita
- Start date
The only brazing of aluminium I've seen is using lumiweld, for which a decent propane torch is enough: oxy propane would be fine.
BUT, it's very expensive and not what you'd use for thin sheet or large jobs. Much more suitable for small jobs on castings. The lumiweld is much, much harder than the metal being joined.
Aluminium welding is commonly done with oxy acetalyne or oxy hydrogen, so oxy propane might be OK for small jobs in thin material.
There's a thread here on it, plenty of stuff in the Fournier and Finch and Munroe books, and FROST will even sell you a CD of Fournier doing it!
Important points. You need a flux and you need blue goggles (or you can see nothing through the sodium flare created by the flux): this isn't about welding shade, but about colour filtration.
BUT, it's very expensive and not what you'd use for thin sheet or large jobs. Much more suitable for small jobs on castings. The lumiweld is much, much harder than the metal being joined.
Aluminium welding is commonly done with oxy acetalyne or oxy hydrogen, so oxy propane might be OK for small jobs in thin material.
There's a thread here on it, plenty of stuff in the Fournier and Finch and Munroe books, and FROST will even sell you a CD of Fournier doing it!
Important points. You need a flux and you need blue goggles (or you can see nothing through the sodium flare created by the flux): this isn't about welding shade, but about colour filtration.
Ragnarok
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just a little note, if you use a speedglas electric welding helmet for mit/tig/arc it should work for welding aluminium with oxy acetylene when it's switched off, as it's made for gas welding when switched off and i have read that they work for aluminium, also you can get murex goggles for Gas Welding Flux they're marked GWF 
I shall be trying oxy/acetylene aluminium welding too soon
I shall be trying oxy/acetylene aluminium welding too soon Personally i'd never go near aluminium with lumiweld type filler, zinc alloys though...
4047 can be used for both brazing and welding, melting point is 585C versus 650ish (alloy dependant) for other common alloys. Flux and the right filter lens required obviously
Oxy-butane... certainly be hot enough don't know if/how well it'd work though. Floating around in the back of mind is something about the amount of oxygen required but i can't remember if it was a technical (there's more to a flame than just temp) or economic reason. Could just be imagining it though!
4047 can be used for both brazing and welding, melting point is 585C versus 650ish (alloy dependant) for other common alloys. Flux and the right filter lens required obviously
Oxy-butane... certainly be hot enough don't know if/how well it'd work though. Floating around in the back of mind is something about the amount of oxygen required but i can't remember if it was a technical (there's more to a flame than just temp) or economic reason. Could just be imagining it though!
