Abstract: A beam-supported joining machine, in particular laser transmission welding device, including a beam head for providing a joining beam producing a joining seam between two components, a receiver for mounting the first component, and a clamping mechanism for clamping the components, in particular to clamp components with a joining seam running three-dimensionally. The clamping mechanism has a clamping device adapted to the course of the joining seam to produce a clamping force between the two components at least in the region of the respective joining zone acted upon by the joining beam, wherein a magnetic or magnetisable strip adapted to the course of the joining seam is provided as the clamping device, which strip, at least in the region of the respective joining zone acted upon by the joining beam, applies a clamping force to the components by a control magnet guided with the joining beam due to the magnetic forces acting between the strip and control magnet.