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 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 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 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. <EOS>