Seat having a welded transverse shaft

A seat comprising a seat part and a backrest pivotally mounted relative to the seat part, the backrest including a backrest frame with two mutually opposite side bars, wherein the two side bars are connected with each other via a transverse shaft which is rotatably mounted on the seat part in the region of a side bar, and wherein at least one fitting arrangement with a fitting part fixed at the backrest frame is provided wherein the at least one fitting arrangement is configured to arrest the pivotally mounted backrest relative to the seat part, wherein the fitting part fixed at the backrest frame is welded to one of the side bars and the transverse shaft is welded to this fitting part, and an end of the transverse shaft remote from the fitting arrangement extends through another one of the two side bars and this end is rotatably mounted in a seat side part of the seat part, so that the transverse shaft defines a pivot axis about which the backrest is pivotable relative to the seat part, the transverse shaft itself serving as a bearing for pivotably mounting the backrest on the seat side part of the seat part remote from the fitting arrangement.