Patent ID: 8516823

Claim:
A gas turbine comprising: at least one annular combustion chamber comprising an annular inner shell and an annular outer shell, each shell being formed of sheet metal and having a split line which splits each shell into an upper half shell and a lower half shell; wherein the inner shell is, the outer shell is, or both shells are closed in the split line by at least one split line weld seam; and cooling holes in the inner shell, the outer shell, or both, along the at least one split line weld seam, the cooling holes being configured and arranged to film-cool at least part of the at least one split line weld seam; wherein at least one of the inner and outer shells comprises an indentation having three bends in said sheet metal, the at least one split line weld seam and the cooling holes being formed in the indentation, the indentation having a bottom pointing away from the hot gas side of the at least one annular combustion chamber, the bottom being directly exposed to hot gases in the combustion chamber, the indentation configured and arranged to guide a cooling air film along the split line weld seam; and wherein the bottom of the indentation extends lengthwise parallel to the main flow of the at least one annular combustion chamber.