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Aluminium Solder
Roger B:
Chris, these rods are coated in a white flux. The flux started to melt and flow almost at the same time as the metal.
steamer:
--- Quote from: Jasonb on December 12, 2019, 07:07:34 AM ---For things that matter the welded structure is retreated as a whole, things like ali bike frames certainly are.
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Thanks Jason...that makes sense....I haven't done any welded structural aluminum. When it's mattered the projects I worked on were all riveted panels...but yes.....reheat treating the object makes sense.
Dave
fumopuc:
Hi Roger, here a very special source for Aluminium and other soldering in Europe.
https://rexin-loettechnik.de/
An excelent service by phone is always available. Currently the owner has some trouble with his e-mail acount.
Don1966:
I have used these rods and they do work to a certain extent. I find it make a porous weld. The material has to be well clean with a stainless brush fo it it adhere to the material your welding. Melting temp is way lower then the aluminum! Just my two cents....
Don
Muzzer:
--- 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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Interesting - I hadn't twigged that many of these alloys are PH. Although not the definitive font of all knowledge, Wikipedia says of 6061T6:
"6061 is highly weldable, for example using tungsten inert gas welding (TIG) or metal inert gas welding (MIG). Typically, after welding, the properties near the weld are those of 6061-T4, a loss of strength of around 40%. The material can be re-heat-treated to restore near -T6 temper for the whole piece. After welding, the material can naturally age and restore some of its strength as well. Most strength is recovered in the first few days to a few weeks. Nevertheless, the Aluminum Design Manual (Aluminum Association) recommends the design strength of the material adjacent to the weld to be taken as 165 MPa/24000 PSI without proper heat treatment after the welding."
Thanks for the eye opener!
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