Welding method for joining overlapping sheets, at least comprising an upper sheet and a lower sheet, by means of a metal inert-gas-shielded welding device, comprising a welding torch with a welding wire and a wire feed facility to feed in the welding wire, which to this end is guided movably in its longitudinal direction inside the welding torch, having the method steps: a) positioning of the welding torch and thus of the welding wire on a predetermined joining site with specified spacing above the upper sheet, whereby the welding wire is orientated at an angle of 90 ± 30° to the sheet plane of the upper sheet; b) delivery of the welding wire in the direction of the upper sheet by means of the wire feed facility with a variably adjustable wire feed speed; and characterised by the further method steps: c) fusing of the upper sheet and melting of the welding wire by means of an arc started between the upper sheet and the welding wire with the formation of a trough-shaped molten puddle of molten weld metal; d) pressing of the molten weld metal onto the lower sheet by means of the welding wire, whereby the average wire feed speed is in the range from 10 to 40 m·min -1 and the lower sheet is melted through with the formation of a breakthrough, the lateral extent of which is smaller than that of the trough-shaped molten puddle, and additionally material of the lower sheet is absorbed in the molten weld metal; f) pressing of the weld metal through the breakthrough in the lower sheet by means of the welding wire; g) filling-up of the joining site with molten weld metal through continuing fusing of the sheets (1, 2) and of the welding wire by means of the arc; and h) switching-off of the arc and of the wire feed facility after a determined welding time, whereby the weld metal solidifies with the formation of a performed head (7.1) in the region of the upper sheet, of a drop-shaped closing head (7.3) on the surface of the lower sheet facing away from the welding torch and of a shank (7.2) inside the lower sheet, the lateral extent of which is smaller than that of the performed head (7.1) and of the closing head (7.3). a) positioning of the welding torch and thus of the welding wire on a predetermined joining site with specified spacing above the upper sheet, whereby the welding wire is orientated at an angle of 90 ± 30° to the sheet plane of the upper sheet; b) delivery of the welding wire in the direction of the upper sheet by means of the wire feed facility with a variably adjustable wire feed speed; c) fusing of the upper sheet and melting of the welding wire by means of an arc started between the upper sheet and the welding wire with the formation of a trough-shaped molten puddle of molten weld metal; d) pressing of the molten weld metal onto the lower sheet by means of the welding wire, whereby the average wire feed speed is in the range from 10 to 40 m·min -1 and the lower sheet is melted through with the formation of a breakthrough, the lateral extent of which is smaller than that of the trough-shaped molten puddle, and additionally material of the lower sheet is absorbed in the molten weld metal; f) pressing of the weld metal through the breakthrough in the lower sheet by means of the welding wire; g) filling-up of the joining site with molten weld metal through continuing fusing of the sheets (1, 2) and of the welding wire by means of the arc; and h) switching-off of the arc and of the wire feed facility after a determined welding time, whereby the weld metal solidifies with the formation of a performed head (7.1) in the region of the upper sheet, of a drop-shaped closing head (7.3) on the surface of the lower sheet facing away from the welding torch and of a shank (7.2) inside the lower sheet, the lateral extent of which is smaller than that of the performed head (7.1) and of the closing head (7.3).