gonna be ordering the materials for making my new subframe. What is the best grade of aluminium that I need to be ordering. Il be using 3/4 square tube various thicknesses of plate and sheet for my undertray.
Most square aluminum tubing comes in a 6061. There are a few variants about but I dont see many.
6061 has the hardest alloy, being durable so to speak and still maintains weldable properties. 7075 welds for shit and as you go down the list in reverse, the alloys become softer and less predictable for your application.
Long story short? Get 6061 and in 1/8" wall. Your welder will thank you later for it.
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