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Aluminium Solder
Vixen:
I have used something similar?? stuff called Techno-weld. It is an alloy of bismuth + tin + antimony which needs no flux, but you do need to remove the oxide coating off the aluminium with the supplied stainless steel wire brush and then use the stainless steel rod to scratch the aluminium's surface, just before you add the weld rod. The weld rods melts between 380 and 408*C and dissolves into the aluminium being welded. The guy demonstrating the Techno-weld rods makes it look very easy, it probably is, when you have used it as often as he has. It does take practice to get a decent looking weld. A good welded joint seems to be quite strong.
Mike
steamer:
--- Quote from: Vixen on December 11, 2019, 10:07:08 PM ---I have used something similar?? stuff called Techno-weld. It is an alloy of bismuth + tin + antimony which needs no flux, but you do need to remove the oxide coating off the aluminium with the supplied stainless steel wire brush and then use the stainless steel rod to scratch the aluminium's surface, just before you add the weld rod. The weld rods melts between 380 and 408*C and dissolves into the aluminium being welded. The guy demonstrating the Techno-weld rods makes it look very easy, it probably is, when you have used it as often as he has. It does take practice to get a decent looking weld. A good welded joint seems to be quite strong.
Mike
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I have seen the same demo Mike. Some thoughts......Most aluminum alloy sections that we use are most often the common wrought alloys... 6061-T6, 6063-T6, 2024-T4, 7075-T6...ect maybe some A356 cast parts...
Now most of these wrought materials are Precipitation Hardened....which is the "T" number at the end of the designation....here's the rub....once you heat a piece of Aluminum that's been heat treated like this to say anything over 350F...the heat treat is gone. the material strength properties will have dropped pretty significantly. Now....for 99% of what we would use this for...that's probably just fine...but do keep in mind not to be soldering up your latest gantry crane from this stuff hmmmmm? If it matters....get a proper TIG welder on the job.
I watched this youtube vid on a shop test of this material....pretty interesting.....at least from the pragmatic side of things...
I don't think it's any worse than say JB weld....
http://www.youtube.com/watch?v=k21JDVdGalY
Dave
crueby:
--- Quote from: steamer on December 12, 2019, 12:43:11 AM ---...once you heat a piece of Aluminum that's been heat treated like this to say anything over 350F...the heat treat is gone. the material strength properties will have dropped pretty significantly. Now....for 99% of what we would use this for...that's probably just fine...but do keep in mind not to be soldering up your latest gantry crane from this stuff hmmmmm? If it matters....get a proper TIG welder on the job.
...
Dave
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If it was TIG welded, wouldn't that also heat up the metal? Localized for a large part, but what about for a small one, model-sized bits? Thanks for the tips and info!
steamer:
Yes....you're right about heat affected zone....no I can't predict the outcome with the filler metal an all....though usually the welded joint is much stronger than the surrounding metal....and it makes me ask why? :thinking:
I'm sure there are some TIG welders here who can jump in on this one
Dave
Jasonb:
For things that matter the welded structure is retreated as a whole, things like ali bike frames certainly are.
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