Hmmmmm...a cure for everything (rant) - Saab General Bulletin Board - Saabnet.com
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Hmmmmm...a cure for everything (rant)
Posted by VincentD (more from VincentD) on Wed, 28 Apr 2004 02:10:32
In Reply to: Fluxless Brazing Rod?, gorper, Tue, 27 Apr 2004 19:50:00
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Pure Aluminium melts at 1220 degrees F, it's alloys in a range between 900 - 1220 degrees F.
Aluminium brazing materials melt at around 970 - 1150 F depending on application, and are based on the Aluminium - silicon eutectic. Anything that melts below that is technically considered soldering.
The product you're looking at would be in the high soldering range, 700 - 800 degrees F. These solders are typically Zinc based, alloyed with Aluminium, copper, cadmium, tin. I'm skeptical about the 'fluxless' part of it, unless the flux forms part of the constituents. A major reaction flux would be Zinc chloride. The flux is there to penetrate the oxide layer. The reason I say I'm skeptical is that Aluminium oxide melts at 3,700 degrees F. Without a flux, I don't think it would work too well to penetrate the aluminium oxide 'skin'.
My point is, if you don't have to work to a tehnical specification, like if you're repairing your lawnmower or something, it's probably a suitable product. You'll still need to have an idea of what alloy you'd be working on, though. But if you've had to work in aviation(welding, vacuum furnace brazing, metallographic and nondestructive inspection of superalloys) like me for a long time, even a fraction of a percent outside of a recognised specification for a brazing/welding rod/powder is cause for rejection.
I 'm skeptical of secret formulas that you can do everything to anything with. A lot of it I consider media hype. I'm sure there are some out there who would tend to disagree, but that's my opinion. A 'secret formula' brazing rod used on an aviation part WOULD cost me my job.
posted by 159.157.25...
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