you can braze Aluminium with Oxy/Acet, and there is a special rod that can be used for this purpose.
MIG: To do MIG welding on Aluminium there are a few things that you need to change, first one is your tip, you need to go a size bigger for example, if you are using a 0.8mm wire you need to use 0.9mm tip for it. you need to change you conduit liner, this the liner which is inside you torch, there is a special one for the aluminium. And last thing would be you feed rollers inside the machine, you need to get U-Grooved roller which are for aluminium, and of course, you need to get aluminium wire as well.
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