Aluminum brazing

[The Boat House]

I did make a successful prop repair. It’s all about
getting what you want to weld up to the temp. that
will melt the rod. If your melting the rod with the
torch its not sticking to the work. That is why they
use a soda can in there demonstration. Doesn’t take
much to get it up to temp. It was a good color match
when done but it darkened quite a bit after the first
week of use.

[bob-d]

Tubs as usual……amazing work!
Bob D

[joecb]

what wbeaton said… however about color match, if the repaired joint is to be polished and left unfinished, the zinc filler will oxidize to a darker color than the AL, becoming readily apparent over time.
And a helpful thought about joint preparation and cleanliness…. when prepping and "Veeing" out a joint never use an abrasive in the last operation, always a clean file. Aluminum oxide contamination is your enemy!. Final clean up and to help scrub the zinc rod into the joint use a CLEAN stainless steel wire brush that has NEVER touched anything but clean aluminum. I keep a couple of the small stainless steel brushes neatly wrapped in aluminum foil just for this purpose.

Joe B

[Author]

Posts