METHOD FOR FASTENING A ROLLER HEAD TO A WELDING ARM FOR A RESISTANCE SEAM WELDING MACHINE

An arrangement including a welding arm (2) for a resistance seam welding machine and a roller head (1) fastened thereon, which has a stator (3) and an electrode roller (4) which is supported as a rotor on the stator (3) in a rotatable way, wherein the stator (3) protrudes over the electrode roller (4) with fastening extensions (5) on both sides of the electrode roller (4). The welding arm (2) has a reception opening (6) for the roller head (1), which is formed between two limiting walls (7) facing each other, which themselves have fastening reception openings (8) for the fastening extensions (5). The roller head (1) is arranged inside the reception opening (6) in such a way that the electrode roller (4) protrudes outside the reception opening (6) with a part of its circumferential boundary and the fastening extensions (5) are arranged inside the fastening reception openings (8). The roller head (1) is fastened to the welding arm (2) by pressing each of the fastening extensions (5) of the stator (3) with an even contact surface (9) formed thereon to a attributed even contact surface (10, 19) inside the boundaries of the respective fastening reception opening (8), wherein each of the fastening extensions (5) of the stator (3) is pressed with a clamping piece (11) received in the respective fastening reception opening (8) with its contact surfaces (9) against the attributed contact surfaces (10, 19). It has been discovered that mounting errors may be avoided by the arrangement according to the invention and that a good and reliable sealing and current transmission can be reached.