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How to solder aluminum
Identify the alloy if possible.
Pure aluminum can be soldered, although it is not an easy metal to work with. Many aluminum objects are actually aluminum alloys.
Most of these can be soldered the same way, but a few of them are very difficult to work with and may need to be taken to a professional welder. If the aluminum alloy is marked with a letter or number, look it up to see if there are any specific requirements.