The invention relates to a working cylinder having a cylinder liner, a first closing part, a second closing part and a
piston unit, the cylinder liner having a cylinder liner first end and a cylinder liner second end, the first closing part being arranged on the cylinder liner first end, the second closing part being arranged on the cylinder liner second end, and the
piston unit being arranged on the cylinder liner first end. The first closing part is arranged at the first end of the cylinder liner, the second closing part is arranged at the second end of the cylinder liner, the cylinder liner and the closing parts form a cylinder inner cavity, the
piston unit forms at least one working cavity in the cylinder inner cavity, and the piston unit penetrates through the first closing part in a sliding mode. The first closing part is integrally bonded to the cylinder liner by means of an annular first
laser circumferential weld, and the second closing part is integrally bonded to the cylinder liner by means of an annular second
laser circumferential weld, and the
laser circumferential welds each form a fluid-tight sealing plane. An annular sealing ring is arranged axially spaced apart from the respective laser circumferential weld between each closing part and the inner wall of the cylinder liner, the sealing ring forming a pressure-separated ring section between each annular sealing ring and each laser circumferential weld.