Use aluminium alloy 6*** 6061 or 6082 good ratio resistance/weight. Easy to weld. Avoid ricristallizazion after extrusion for fatigue and corrosion performance.
Hi, Gianfranco, now i am at home, but i work in a foundry and we develop alloys. Send me detailed information about what you want to do. When a go back to work i will ask also to other engineers. Bye, Fabrizio Fabrizio@libero.it