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Welding alloys(3 posts)

Welding alloysGreyhound
Mar 4, 2002 12:04 PM
Can different aluminum alloys be welded together? I ask this becuase on Easton's website they list top tubes, down tubes, seat tubes, and head tubes in scandium but no stays. I'm guessing that means standard alloy is used for these parts on a scandium bike. If this is true, what are the limitations on what alloys can be welded together? And on a different note, what is better for weight/strength of the frame, polishing or shot-peening(sp) and anodizing? Thanks for any feedback.

re: Welding alloysslow-ron
Mar 4, 2002 1:10 PM
I know that different aluminum alloys can be welded but I'm not sure on all the limitations. I think that you must use filler rod and alloys that have the same relative melt temperatures. Proper alloy and filler rod selection is a science in itself.

As for adding weight/strength to an aluminum frame, polishing does neither. It could add a bit of fatigue strength if you polish away surface imperfections. Anodizing is a process whereby the aluminum is placed in a solution to oxidize the metal. This is for corrosion resistance. I don't think this would add any appreciable weight or add any strength. Shot-peening is used to relieve surface stresses on metals and helps to increase the fatigue strength of the part. This would not add any additional weight to the frame.
re: Welding alloyscurlybike
Mar 5, 2002 7:19 AM
I got the impression from my builder that the scandium tube set came with the welding rod that was required. Maybe it is formulated to allow mixing of not exactly the same alloys.