A METHOD OF MANUFACTURING A SUBMARINE POWER CABLE

A method of manufacturing a submarine power cable, comprising: a) providing an insulation system around a conductor, the insulation system including an inner semiconducting layer arranged around the conductor, an insulation layer arranged around the inner semiconducting layer, and an outer semiconducting layer arranged around the insulation layer, b) arranging a metal sheath around the insulation system, and c) welding opposing edges of the metal sheath longitudinally by autogenous welding to form a metallic water-blocking layer around the insulation system, wherein the metal sheath consists of a copper material comprising at least 99 wt.% copper and at most 0.1 wt.% oxygen, or wherein the metal sheath consists of a stainless steel which has a chromium equivalent in a range of 16-25 and a nickel equivalent in a range of 11-22 according to a Schaeffler-DeLong constitutional diagram for which the chromium equivalent is calculated according to the formula %Cr + %Mo + 1.5 × %Si + 0.5 × %Nb and the nickel equivalent is calculated according to the formula %Ni + 0.5 × %Mn + 30 × (%C + %N).