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+--- Thread: How can I tell different aluminum alloys apart? (/showthread.php?tid=30503)
How can I tell different aluminum alloys apart? - aluminiumsheet - 12-17-2019
There are quite a few different aluminum alloys and for proper and safe welding, you should know what alloy your welding. If you don't, you can follow these general guidelines:
Extrusions are generally 6000 series alloys
Castings most often are a combination of aluminum/silicon cast -- some are weldable, others are not
Pieces of sheet, plate or bar are probably 5000 to 6000 series alloys
If you want to be precise, purchase an alloy tester kit that will help you determine the exact makeup of your alloy.