A working cylinder, comprising a cylinder tube with a main longitudinal axis, a first closure part, a second closure part and a piston unit, wherein the cylinder tube comprises a first cylinder tube end and a second cylinder tube end, wherein the first closure part is arranged at the first cylinder tube end, wherein the second closure part is arranged at the second cylinder tube end, wherein the cylinder tube and the closure parts (3, 4) form a cylinder interior, wherein the piston unit is arranged axially displaceable along the main longitudinal axis in the cylinder interior and forms at least one working chamber in the cylinder interior, wherein the piston unit slidingly passes through the first closure part, wherein the first closure part is connected in a positive substance manner to the cylinder tube by means of a first circumferential laser ring weld seam and the second closure part is connected to the cylinder tube by means of a second circumferential laser ring weld seam, wherein the laser ring weld seams (9, 10) each form a fluid-tight sealing plane, characterized in that the laser ring weld seams (9, 10) each have a ring weld seam centre axis, wherein the ring weld seam centre axis and a main longitudinal axis of the cylinder tube enclose a ring weld seam inclination angle alpha (a), wherein alpha (a) is 20 to 70 degrees, and that a first circumferential sealing ring is arranged in the cylinder interior between the first closure part and a cylinder tube inner wall of the cylinder tube at its first cylinder tube end, axially spaced from the first laser ring weld seam, and forms a first pressure-separated ring section which is arranged between the first circumferential sealing ring and the first laser ring weld seam, and/or a second circumferential sealing ring is arranged in the cylinder interior between the second closure part and a cylinder tube inner wall of the cylinder tube at its second cylinder tube end, axially spaced from the second laser ring weld seam, and forms a second pressure-separated ring section which is arranged between the second circumferential sealing ring and the second laser ring weld seam. comprising a cylinder tube with a main longitudinal axis, a first closure part, a second closure part and a piston unit, wherein the cylinder tube comprises a first cylinder tube end and a second cylinder tube end, wherein the first closure part is arranged at the first cylinder tube end, wherein the second closure part is arranged at the second cylinder tube end, wherein the cylinder tube and the closure parts (3, 4) form a cylinder interior, wherein the piston unit is arranged axially displaceable along the main longitudinal axis in the cylinder interior and forms at least one working chamber in the cylinder interior, wherein the piston unit slidingly passes through the first closure part, wherein the first closure part is connected in a positive substance manner to the cylinder tube by means of a first circumferential laser ring weld seam and the second closure part is connected to the cylinder tube by means of a second circumferential laser ring weld seam, wherein the laser ring weld seams (9, 10) each form a fluid-tight sealing plane, characterized in that the laser ring weld seams (9, 10) each have a ring weld seam centre axis, wherein the ring weld seam centre axis and a main longitudinal axis of the cylinder tube enclose a ring weld seam inclination angle alpha (a), wherein alpha (a) is 20 to 70 degrees, and that a first circumferential sealing ring is arranged in the cylinder interior between the first closure part and a cylinder tube inner wall of the cylinder tube at its first cylinder tube end, axially spaced from the first laser ring weld seam, and forms a first pressure-separated ring section which is arranged between the first circumferential sealing ring and the first laser ring weld seam, and/or a second circumferential sealing ring is arranged in the cylinder interior between the second closure part and a cylinder tube inner wall of the cylinder tube at its second cylinder tube end, axially spaced from the second laser ring weld seam, and forms a second pressure-separated ring section which is arranged between the second circumferential sealing ring and the second laser ring weld seam.