A pressure welding device (1) includes a plastification device (7), an upsetting device (8) and a mounting (11) for the components (2,3) to be welded together and a machine frame (12). The pressure welding device further includes a machine head (13) and an upsetting head (27) which can be moved relative one another along a machine axis (6). The mounting (11) includes a component seat (36), which is mounted on the machine frame (12) so as to be able to float between the machine head (13) and the upsetting head (27), and a preferably automatic adjusting device (17) for adaptation to different component dimensions, in particular component lengths.