Thanks Ted, your reply is very helpful.
I was hoping that splines are ok, but now I'm not sure at all. I don't have much experience with welding so not sure how penetrating the weld can be, but I really hope that it's not bonded too deeply. What do you think?
I'm attaching a picture, maybe it can give you some idea. Be warned, it looks ugly.
By the way, the new sprocket I got is JT Sprocket, High Carbon Steel. I assume it's good for the purpose.
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