A working cylinder, comprising a cylinder and a piston unit, wherein the cylinder comprises a cylinder tube, a closure part and a further closure part, wherein the cylinder tube comprises a cylinder tube end portion and a further cylinder tube end portion, wherein the closure part is arranged at the cylinder tube end portion and the further closure part is arranged at the further cylinder tube end portion, and wherein the cylinder tube and the closure parts (4a, 4b) form a cylinder interior, wherein the piston unit forms at least one working chamber (6.1) in the cylinder interior, wherein the cylinder comprises a coupling portion, which comprises the closure part and the cylinder tube end portion, wherein the cylinder tube end portion comprises a threaded cylinder tube portion (5.1a), an intermediate cylinder tube portion (5.2a), and a cylinder tube end (5.3a), wherein the closure part has an external thread and the threaded cylinder tube portion (5.1a) has an internal thread corresponding to the external thread, wherein the external thread and the internal thread form a common threaded portion which is designed to couple the closure part and the cylinder tube in a form-fit manner, wherein the cylinder tube end portion is connected to the closure part in a positive substance manner by means of a circumferential ring weld seam, wherein the ring weld seam is made as a laser ring weld seam and forms a pressure-medium-tight sealing plane, wherein the working cylinder is designed to assume a load-relieved operating state or a loaded operating state, wherein in the load-relieved operating state, no or only a low operating pressure of the pressure medium is applied, wherein in the loaded operating state the full or a high operating pressure of the pressure medium is applied, wherein in the load-relieved operating state the common threaded portion does not absorb any axial tensile force, wherein in the loaded operating state, the ring weld seam and the common threaded portion each absorb an axial tensile force. comprising a cylinder and a piston unit, wherein the cylinder comprises a cylinder tube, a closure part and a further closure part, wherein the cylinder tube comprises a cylinder tube end portion and a further cylinder tube end portion, wherein the closure part is arranged at the cylinder tube end portion and the further closure part is arranged at the further cylinder tube end portion, and wherein the cylinder tube and the closure parts (4a, 4b) form a cylinder interior, wherein the piston unit forms at least one working chamber (6.1) in the cylinder interior, wherein the cylinder comprises a coupling portion, which comprises the closure part and the cylinder tube end portion, wherein the cylinder tube end portion comprises a threaded cylinder tube portion (5.1a), an intermediate cylinder tube portion (5.2a), and a cylinder tube end (5.3a), wherein the closure part has an external thread and the threaded cylinder tube portion (5.1a) has an internal thread corresponding to the external thread, wherein the external thread and the internal thread form a common threaded portion which is designed to couple the closure part and the cylinder tube in a form-fit manner, wherein the cylinder tube end portion is connected to the closure part in a positive substance manner by means of a circumferential ring weld seam, wherein the ring weld seam is made as a laser ring weld seam and forms a pressure-medium-tight sealing plane, wherein the working cylinder is designed to assume a load-relieved operating state or a loaded operating state, wherein in the load-relieved operating state, no or only a low operating pressure of the pressure medium is applied, wherein in the loaded operating state the full or a high operating pressure of the pressure medium is applied, wherein in the load-relieved operating state the common threaded portion does not absorb any axial tensile force, wherein in the loaded operating state, the ring weld seam and the common threaded portion each absorb an axial tensile force.