Door assembly with assembled support part and upper part

A door assembly for a vehicle, comprising a support part and an upper part mounted on the support part, a first one of the support part and the upper part comprising a welding hole, a second one of the support part and the upper part comprising a welding boss inserted into the welding hole along a direction of welding, the second one being distinct from the first one, wherein the support part comprises at least one snap-fit slot and the upper part comprises at least one clip inserted into the at least one snap-fit slot, the at least one snap-fit slot comprising at least one supporting surface extending in the direction of welding, the at least one clip comprising at least one hook portion in contact with the at least one support surface of the at least one snap-fit slot so as to lock the upper part in one direction along a direction of immobilization, said direction of immobilization being perpendicular to the direction of welding, wherein the at least one snap-fit slot further comprises an opposite surface and a clip portion, the clip portion defining a snap-fit surface, the clip portion being elastically deformable so that the snap-fit surface is suitable for moving with respect to the support surface, the at least one or each-clip comprising a snap-fit portion snap-fitted in-between the snap-fit surface and the opposite surface of the at least one snap-fit slot, so as to lock the upper part in position along the direction of welding.