I've been building and fabricating with Aluminum for a very long time . I recently welded my son's Cannondale frame for the third time. Bottom bracket cracking around front drop tube. after I weld any of the aluminum frame be it motorcycle or bicycle or any other racing parts. I've never had a weld fail or weakening of the original frames integrity.
I preheat my parts to be welded, I find this to make getting a good solid weld easier. Please let me know how you turnout with this project..
Interesting. In the case of this frame, 7005 Alu, solution hardened to T-6 as a tubeset and then artificially aged after welding, I thought it best(after getting opinions from several knowledgeable chaps, including the aerospace company that treated these frames bitd) to keep heat to a minimum. To that end, the welder was in and out very quickly. The frame will now "age" for several months, thanks to the Canadian winter, before it gets any stress.
Thanks for the encouragement, I fully expect some negativity from the armchair engineers for this part of the build.