The invention relates to a device for manufacturing circumferentially closed tubular tube bodies. The device comprises conveying means for conveying the substrate (10) in a conveying direction, tube-forming means (12) which are designed to form a web-like substrate (10) which has a first and a second longitudinal edge (18, 19), into a tubular form (13), wherein the first and the second longitudinal edge (18, 19)in the circumferential direction form or delimit a contact region (20), in particular an abutting or overlapping region, which extends in the conveying direction, and effect the shaping of the substrate (10) into the tubular form (13) in a shaping region (21), welding means (22) for welding the tubular form (13) at a weld circumferential position, first sensor means (27) for detecting the position of the substrate web (10) in the conveying direction at the upstream of the shaping region (21), adjusting means (26) for adjusting the position of the substrate web transversely with respect to the conveying direction, and first control means (31) which are designed to actuate the setting means (26). The first control means (31) takes into consideration the measurement values from the first sensor means (27), such that the web-like substrate (10) is held in a setpoint position transversely with respect to the conveying direction or such that the web-like substrate (10) is adjusted in the direction of the setpoint position.