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Aluminum Soldering

To: Land-speed@autox.team.net (Landspeed)
Subject: Aluminum Soldering
From: Bobbyhotrods@comcast.net
Date: Tue, 20 Jun 2006 12:18:07 +0000
In industry it's pretty common to get aluminum dip brazed, beautiful stuff and 
not too expensive. Typically the assembly is tacked together via MIG with .001 
spacing of the seams using special shims, then after caustic etching and drying 
an expensive silver-based paste is brushed onto the joint. The part then gets 
pre-heated and goes into the "pot" where a 1200* molten solution (solid when 
cool) allows the paste to flow, creating a joint that's stronger than the 
surrounding material. Note that the part must have no entrapped cavities and 
that rinsing of all areas is required.
Some alloys don't dip braze well. They can tell you or email me. 
The parts are annealled by this process and they must be heat treated 
thereafter if necessary.
Hot work this time of year. BJ




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