Patent ID: 8876214

Claim:
A vehicle seat for motor vehicles, comprising a plurality of structural or retaining parts which are joined together or to a further part in at least one joining region, wherein at least one of the joining regions is being produced by friction welding, wherein the structural or retaining parts which have been joined together consist of different materials, wherein a respective backrest frame side part is joined with a fitting for coupling with a seat frame in at least one of the joining regions or a respective seat frame side part is joined with a fitting for coupling with the backrest frame in at least one of the joining regions, wherein assembly aids are provided on the backrest frame side part and on the fitting, which assembly aids form a pair of assembly aids and engage positively in one another and are configured such that the backrest frame side part and the fitting can be moved relative to one another over a predetermined distance to carry out a friction welding process and are located in a predetermined position relative to one another by a mutual stop of the assembly aids after the conclusion of a movement phase of the friction welding process which serves to heat the portions to be joined together.