A method for additive-free laser beam welding of a metallic tube member to a metallic holding member; comprising the following steps: providing a tube member and providing a holding member for the tube member in such a way that the holding member abuts with an abutting side against an outer circumferential area of the tube member, so that the connecting area between the holding member and the tube member is constituted by the abutting-side end portion of the holding member and the outer circumferential area of the tube member on the abutting side; wherein the holding member abuts in a butt joint against the outer circumferential area of the tube member, in particular at a circumferential angle range of 0.5 to 10° on the outer circumferential area of the tube member; and wherein the focused laser beam strikes the connecting area between the holding member and the tube member laterally from one side, in particular from a tangential direction of the tube member at the connecting area; characterised by: additive-free welding of the holding member to the tube member by operating a laser beam source (10, 14, 22) such that the laser beam strikes an impact area of 700 - 8000 μm 2, in particular 2000 - 3000 μm 2, on the connecting area between the tube member and the holding member; and that relative movement of the laser beam takes place over a large part of the entire width of the connecting area while the laser beam is guided over the zone to be melted for joining by means of a two-dimensional oscillating movement with an energy per section of 20 - 100 J/mm. providing a tube member and providing a holding member for the tube member in such a way that the holding member abuts with an abutting side against an outer circumferential area of the tube member, so that the connecting area between the holding member and the tube member is constituted by the abutting-side end portion of the holding member and the outer circumferential area of the tube member on the abutting side; wherein the holding member abuts in a butt joint against the outer circumferential area of the tube member, in particular at a circumferential angle range of 0.5 to 10° on the outer circumferential area of the tube member; and wherein the focused laser beam strikes the connecting area between the holding member and the tube member laterally from one side, in particular from a tangential direction of the tube member at the connecting area; characterised by: additive-free welding of the holding member to the tube member by operating a laser beam source (10, 14, 22) such that the laser beam strikes an impact area of 700 - 8000 μm 2, in particular 2000 - 3000 μm 2, on the connecting area between the tube member and the holding member; and that relative movement of the laser beam takes place over a large part of the entire width of the connecting area while the laser beam is guided over the zone to be melted for joining by means of a two-dimensional oscillating movement with an energy per section of 20 - 100 J/mm. additive-free welding of the holding member to the tube member by operating a laser beam source (10, 14, 22) such that the laser beam strikes an impact area of 700 - 8000 μm 2, in particular 2000 - 3000 μm 2, on the connecting area between the tube member and the holding member; and that relative movement of the laser beam takes place over a large part of the entire width of the connecting area while the laser beam is guided over the zone to be melted for joining by means of a two-dimensional oscillating movement with an energy per section of 20 - 100 J/mm.