A welding sleeve for armoured cables, wherein the welding sleeve comprises: a first sleeve part having a plurality of axial openings, and arranged to receive an armoured cable, wherein the first sleeve part has a perimeter surface for welding armouring wires of an armoured cable thereto, a second sleeve part, having a plurality of axial openings, and arranged to receive an armoured cable, wherein the second sleeve part has a perimeter surface for welding armouring wires of an armoured cable thereto, a plurality of longitudinal members, and a plurality of first stoppers and second stoppers, wherein each longitudinal member extends axially from a respective one of said axial openings of the first sleeve part to a respective one of said axial openings of the second sleeve part and is received in said respective axial openings, whereby the first sleeve part and the second sleeve part are coaxially mounted to each other, wherein each longitudinal member is provided with a first stopper at one end thereof for delimiting axial displacement of the first sleeve part, wherein the opposite end of each longitudinal member forms a second stopper for delimiting axial displacement of the second sleeve part, wherein the longitudinal members have a longitudinal extension which allows the first sleeve part and the second sleeve part to slide along the longitudinal members between the first stoppers and second stoppers, enabling axial displacement of the first sleeve part relative to the second sleeve part, characterised by a plurality of energy accumulation members arranged to bias the first sleeve part axially away from the second sleeve part. a first sleeve part having a plurality of axial openings, and arranged to receive an armoured cable, wherein the first sleeve part has a perimeter surface for welding armouring wires of an armoured cable thereto, a second sleeve part, having a plurality of axial openings, and arranged to receive an armoured cable, wherein the second sleeve part has a perimeter surface for welding armouring wires of an armoured cable thereto, a plurality of longitudinal members, and a plurality of first stoppers and second stoppers, wherein each longitudinal member extends axially from a respective one of said axial openings of the first sleeve part to a respective one of said axial openings of the second sleeve part and is received in said respective axial openings, whereby the first sleeve part and the second sleeve part are coaxially mounted to each other, wherein each longitudinal member is provided with a first stopper at one end thereof for delimiting axial displacement of the first sleeve part, wherein the opposite end of each longitudinal member forms a second stopper for delimiting axial displacement of the second sleeve part, wherein the longitudinal members have a longitudinal extension which allows the first sleeve part and the second sleeve part to slide along the longitudinal members between the first stoppers and second stoppers, enabling axial displacement of the first sleeve part relative to the second sleeve part, characterised by a plurality of energy accumulation members arranged to bias the first sleeve part axially away from the second sleeve part.