Posted by admin on Sunday, May 3, 2009 · Leave a Comment
I have been doing some welding here and there, and recently I was doing some brazing in my garage. Usually what I do is I take a corner magnet to stand the two pieces together how I want. Except this time, these pieces of metal would not stick to the magnet, not even slightly.
I purchased these pieces as 'drop pieces', so I have no idea what alloy they are and so on. But I find this highly unusual, I wasn't aware that there was such a thing as metal that was not magnetic.
I proceeded to braze the pieces together, instead of using a magnet I used a wrench to physically hold it in place. I got it good and brazed in place with my solder, the solder DIDN'T STICK!
Another perplexing idea to me. I would imagine that searing hot metal oozing upon other pieces of metal at 1000 degrees F would certainly stick. But it didn't. Any thoughts?
I always clean the metal well before I weld. But I will try some more : )
Most metals aren't magnetic (only iron, nickel and cobalt at room temperature afaik) but the solder may not have stuck to the aluminium because of the oxide layer on the aluminium forming very rapidly (even after scrubbing it clean and leaving it for a while). You need to scrub it clean before soldering, eg with steel wool. The heat will cause it to oxidise much faster, so you should try to clean it and then apply heat and solder as fast as you can.
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