wrote in message
...
okay thank you!

i do want to use 6061 but there aren't too many suppliers of aluminum
alloys in my country and I just found this one that sells 6063 alloy
products.

either 6061, 7075 or 2024 alloys but then it's really difficult to
look for suppliers here.

i guess i'll have to look around some more.

Except for 6061, those other alloys will require lugs and adhesive assembly,
rather than welding. 7075 can be welded but it loses its corrosion
resistance. On 2024, you won't get a satisfactory weld, and the tubes may
crack. And the welding on 6061, or any weldable aluminum alloy, almost has
to be TIG (GTAW) when you're welding tubes.

All in all, you need a really good reason to make a tube structure out of
aluminum, rather than steel.

--
Ed Huntress