Housing with pressure-resistant enclosure (ex-d) type ignition protection for housing electrical elements which may be or may form sources of ignition, having two housing shells (15, 16) engaging with each other, which are connected to each other by a self-contained, unbranched, continuous welded seam, wherein the housing has: a first housing shell which has a base section and two side sections (19, 20) which are connected to this on sides of the base section which face one another and form an angle with this, such that the two side sections (19, 20) form first jaw openings delimited on three sides, having a first shape, a second housing shell which has a base section and two side sections (33, 34) which are connected to this on sides of the base section which face one another and form an angle with this, such that the two side sections (33, 34) form jaw openings delimited on three sides, having a second shape, wherein the two housing shells (15, 16) are arranged with their side sections (19, 20; 33, 34) engaging with one another in such a way that the side sections (19, 20) of the first housing shell close the jaw openings of the second housing shell and the side sections (33, 34) of the second housing shell close the jaw openings of the first housing shell, characterised in that the edges (27, 41) are close together and wherein the welded seam extends along the two edges (27, 41) over the whole length thereof with no gaps, wherein the second housing shell has a strip-like front surface as an edge, said front surface being at least partially overlapped by the first housing shell, or the first housing shell has a strip-like front surface as an edge, said front surface being at least partially overlapped by the second housing shell, wherein the welded seam is formed as a fillet weld between the edge of the first housing shell and the edge of the second housing shell. a first housing shell which has a base section and two side sections (19, 20) which are connected to this on sides of the base section which face one another and form an angle with this, such that the two side sections (19, 20) form first jaw openings delimited on three sides, having a first shape, a second housing shell which has a base section and two side sections (33, 34) which are connected to this on sides of the base section which face one another and form an angle with this, such that the two side sections (33, 34) form jaw openings delimited on three sides, having a second shape, wherein the two housing shells (15, 16) are arranged with their side sections (19, 20; 33, 34) engaging with one another in such a way that the side sections (19, 20) of the first housing shell close the jaw openings of the second housing shell and the side sections (33, 34) of the second housing shell close the jaw openings of the first housing shell, characterised in that the edges (27, 41) are close together and wherein the welded seam extends along the two edges (27, 41) over the whole length thereof with no gaps, wherein the second housing shell has a strip-like front surface as an edge, said front surface being at least partially overlapped by the first housing shell, or the first housing shell has a strip-like front surface as an edge, said front surface being at least partially overlapped by the second housing shell, wherein the welded seam is formed as a fillet weld between the edge of the first housing shell and the edge of the second housing shell.