Abstract: A method for gas-shielded arc brazing of a steel sheet; wherein a solid wire containing copper, as a main component, and aluminum is used in arc brazing of a steel sheet; and the method including periodically carrying out pulse droplet transfer and short circuit droplet transfer in arc brazing using, as a shielding gas, a mixed gas consisting of 0.03 to 0.3% by volume of oxygen gas and the remainder which is argon.

Abstract: A shielding gas for MAG welding wherein a carbon steel solid wire is used for lap fillet welding of a galvanized steel sheet; wherein the shielding gas is a mixed gas composition consisting of 8 to 15% by volume of oxygen, 20 to 30% by volume of carbon dioxide, and residual % by volume of argon.

Abstract: A shield gas for use in welding of galvanized steel sheet with the simultaneous use of laser welding and arc welding, wherein, providing that A refers to the vol. % of carbon dioxide gas and B to the vol. % of oxygen gas in the shield gas, in the event of overlapped welding of steel sheets, at least one of which is a galvanized steel sheet, when the gap between the steel sheets is 0, 15?A?50, 5?B?9 and B?21?0.8A, when the ratio of G/T, in which G is the gap between the steel sheets and T the thickness of the steel sheet positioned on the side of welding torch, is 1 or below and when the thicknesses of the steel sheets are identical with each other, 15?A?50, 3?B?9 and B?0.1A, and when the ratio of G/T is 1 or below and when the thicknesses of the steel sheets are different from each other, 10?A?50, 3?B?9 and B?0.1A and B?15?0.6A, and in the event of overlapped fillet welding, when both the steel sheets to be welded are galvanized steel sheets, 3?A?25, 5?B?13 and B?10?0.

Abstract: The present invention relates to a shielding gas for hybrid welding of a steel plate by combining laser welding and arc welding, characterized by containing: carbon dioxide; and oxygen, in which the mixing ratio of carbon dioxide and oxygen satisfies the following conditions: 15?A?35, 1.0?B?9.0, and B?16-0.6 A, in which A is the volume percentage of carbon dioxide and B is the volume percentage of oxygen.

Abstract: A shielding gas for MAG welding wherein a carbon steel solid wire is used for lap fillet welding of a galvanized steel sheet; wherein the shielding gas is a mixed gas composition consisting of 8 to 15% by volume of oxygen, 20 to 30% by volume of carbon dioxide, and residual % by volume of argon.

Abstract: A shielding gas for MAG welding wherein a carbon steel solid wire is used for lap fillet welding of a galvanized steel sheet; wherein the shielding gas is a mixed gas composition consisting of 8 to 15% by volume of oxygen, 20 to 30% by volume of carbon dioxide, and residual % by volume of argon.

Abstract: A method for laser welding steel sheets in which a gas mixture comprising at least one of argon, helium and nitrogen, and 20 to 50% by volume of a carbon dioxide gas, or a gas mixture comprising at least one of argon, helium and nitrogen, 10 to 40% by volume of a carbon dioxide gas and 1 to 5% by volume of an oxygen gas is used as a shield gas.

Abstract: A heat-resistant separator composed of a non-woven fabric of high-melting resin, 1 to 20 &mgr;m in average fiber diameter, 5 to 300 g/m2 in basis weight, 1 to 200 cc/cm2/sec in air permeability, and 0.01 to 1.0 mm in thickness, or a laminated heat-resistant separator composed of a laminate having a melt-blown, non-woven fabric layer of high-melting resin, 1 to 20 &mgr;m in average fiber diameter, 5 to 300 g/m2 in basis weight, 1 to 200 cc/cm2/sec in air permeability, and 0.01 to 1.0 mm in thickness is more resistant to heat, and hence safer, and is suitable for batteries and electrical double-layer capacitors serviceable at high temperature.

Abstract: A heat-resistant separator composed of a non-woven fabric of high-melting resin, 1 to 20 &mgr;m in average fiber diameter, 5 to 300 g/m2 in basis weight, 1 to 200 cc/cm2/sec in air permeability, and 0.01 to 1.0 mm in thickness, or a laminated heat-resistant separator composed of a laminate having a melt-blown, non-woven fabric layer of high-melting resin, 1 to 20 &mgr;m in average fiber diameter, 5 to 300 g/m2 in basis weight, 1 to 200 cc/cm2/sec in air permeability, and 0.01 to 1.0 mm in thickness is more resistant to heat, and hence safer, and is suitable for batteries and electrical double-layer capacitors serviceable at high temperature.

Abstract: A non-woven fabric for filtering medium having graded packing density. The packing density is the lowest at one surface, and gradually increases towards the other surface at which the packing density becomes the greatest. The gradually increasing packing density and the nearly constant increasing rate of the packing density of the non-woven fabric provide a good filtering efficiency and elongate the life time of a filter.

Abstract: A laminated non-woven fabric for filtering medium, which is composed of a plurality of non-woven fabric layers having different average pore sizes and laminated in the order of the average pore size, and a plurality of entangled regions interposed between any of adjacent two non-woven fabric layers which is formed by causing fibers of one of the adjacent two non-woven fabric layers to penetrate into the other layers to entangle the penetrated fibers with fibers of the other layers. The presence of the entangled regions provide a gradual change of the pore size from a non-woven fabric layer to another non-woven fabric layer to result in a good filtering efficiency and an elongated lifetime of a filter.