A method of manufacturing a lightweight pressure vessel (1; 1'), forming a lightweight pressure tank, from a metal material with two domed vessel bottoms (12, 14; 12', 14'; 12"), wherein the domed vessel bottoms (12, 14; 12', 14'; 12") are connected or integrally formed with each other or with at least one cylindrical vessel portion, wherein at least one of the vessel bottoms (12, 14; 12', 14'; 12") is at least partially manufactured seamlessly by additive manufacturing by means of a thermal spray process, characterised in that the metal material is applied by means of at least one spray nozzle (30, 30', 30", 30′′′, 30"") as a spray jet to a surface (21, 60, 60', 70, 90) of at least one formwork mould (2, 6, 6', 6", 7, 9) and that the production of the respective domed vessel bottom (12, 14) is carried out by the following steps: a) providing an annular body having a y-shaped cross-section with a cylindrical outer wall and a brim extending radially obliquely inwards from there at an acute angle (α) and having a radially inner peripheral edge, the wall thickness of the brim tapering towards the radially inner circumferential edge, as a result of which a wall portion extending obliquely in cross-section is formed as a chamfer at the free end of the brim, b) providing a domed formwork mould having a concave or convex domed mould surface, c) placing the annular body, which is y-shaped in cross-section, on the edge of the domed formwork mould in such a way that the brim of the annular body rests on the domed mould surface and covers the edge thereof, the obliquely extending wall portion of the brim forming the chamfer facing away from the mould surface, d) applying the metal material by a spray jet by means of at least one spray nozzle according to the thermal spray method onto the oblique wall portion of the annular body and onto the mould surface of the domed formwork mould to form a central domed portion seamlessly adjoining the brim and integrally formed therewith, and e) removing the unit forming the vessel bottom (12, 14), consisting of the domed portion and the annular body, from the domed formwork mould. wherein at least one of the vessel bottoms (12, 14; 12', 14'; 12") is at least partially manufactured seamlessly by additive manufacturing by means of a thermal spray process, characterised in that the metal material is applied by means of at least one spray nozzle (30, 30', 30", 30′′′, 30"") as a spray jet to a surface (21, 60, 60', 70, 90) of at least one formwork mould (2, 6, 6', 6", 7, 9) and that the production of the respective domed vessel bottom (12, 14) is carried out by the following steps: a) providing an annular body having a y-shaped cross-section with a cylindrical outer wall and a brim extending radially obliquely inwards from there at an acute angle (α) and having a radially inner peripheral edge, the wall thickness of the brim tapering towards the radially inner circumferential edge, as a result of which a wall portion extending obliquely in cross-section is formed as a chamfer at the free end of the brim, b) providing a domed formwork mould having a concave or convex domed mould surface, c) placing the annular body, which is y-shaped in cross-section, on the edge of the domed formwork mould in such a way that the brim of the annular body rests on the domed mould surface and covers the edge thereof, the obliquely extending wall portion of the brim forming the chamfer facing away from the mould surface, d) applying the metal material by a spray jet by means of at least one spray nozzle according to the thermal spray method onto the oblique wall portion of the annular body and onto the mould surface of the domed formwork mould to form a central domed portion seamlessly adjoining the brim and integrally formed therewith, and e) removing the unit forming the vessel bottom (12, 14), consisting of the domed portion and the annular body, from the domed formwork mould. a) providing an annular body having a y-shaped cross-section with a cylindrical outer wall and a brim extending radially obliquely inwards from there at an acute angle (α) and having a radially inner peripheral edge, the wall thickness of the brim tapering towards the radially inner circumferential edge, as a result of which a wall portion extending obliquely in cross-section is formed as a chamfer at the free end of the brim, b) providing a domed formwork mould having a concave or convex domed mould surface, c) placing the annular body, which is y-shaped in cross-section, on the edge of the domed formwork mould in such a way that the brim of the annular body rests on the domed mould surface and covers the edge thereof, the obliquely extending wall portion of the brim forming the chamfer facing away from the mould surface, d) applying the metal material by a spray jet by means of at least one spray nozzle according to the thermal spray method onto the oblique wall portion of the annular body and onto the mould surface of the domed formwork mould to form a central domed portion seamlessly adjoining the brim and integrally formed therewith, and e) removing the unit forming the vessel bottom (12, 14), consisting of the domed portion and the annular body, from the domed formwork mould.