Here is a used bottom bush. You can see the weld line by more marking on the top half of the bush, the left hand end in the pic. You can also feel it when using a press to put the bushes in.

No matter who welds it I would think there must be some distortion but I would assume that the chap welding the axle parts together for MMC is in a bit more of a rush than Arwyn making a repair.

[Linked Image]