@Anibyl Same for aluminium frames, even the most trivial of fixes is an insane headache. I will not buy another frame that isn't steel unless there just isn't another option. And there will always be another option.

I have a aluminium ebike (long tail cargo) with cracks around the seat stay seat post weld. My current plan is to reinforce the entire area with carbon fibre. Yes that means I'm fixing one unrepairable material with another, but it is the best option available to me.