Judging by the side wear on the front sprocket, the sprockets are out of line, check with a straight edge/string.
If you weld the sprocket on, you do not need to weld All the sprocket to the shaft, just put a couple of blobs on to stop the sprocket coming off, do it so it can be ground off later, try and weld on top of the splines, not in the valleys.It shouldn't take much of a weld to stop it coming off.
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