Abstract: A TIG welding method for a ferrite stainless steel sheet is disclosed, wherein a first shield gas is used wherein the gas is a mixture of argon gas and helium gas, 20 to 90% by volume of helium is included in the mixture, and the flow rate S1 of the first shield gas is set in a range of 0.175 m/sec?S1?1.75 m/sec, and a second shield gas is used wherein the gas is argon gas, and the flow rate S2 of the second shield gas is set in a range of 0.05 m/sec?S2?1.51 m/sec.

Abstract: According to the present invention, an adapter kit is provided in which a welding torch having a single nozzle structure is switched to a welding torch having a double nozzle structure. In an adapter kit (20A) which is installed in a switchable manner in a welding torch (1A) having a single nozzle structure, the present invention includes an attachment (7A) which is mounted to the torch body (5) in a state where the torch nozzle (inner nozzle) (6A) is inserted into the attachment after the gasket is removed and in which a flow channel that supplies a second shielding gas is provided, and an outer nozzle (8A) that is mounted to the attachment (7A) surrounding the periphery of the torch nozzle (6A) and discharges a second shielding gas.

Abstract: A welding method, which performs non-keyhole welding of a ferritic stainless steel having a plate thickness of 3 mm or less using a plasma welding torch (10), includes supplying an inert gas, as a pilot gas (23), into the gap between a tungsten electrode (11) and an insert chip (12) at a flow rate of 2.1 m/sec or less, and supplying a shield gas (24) into the gap between the insert chip (12) and a shield cap (15), wherein a mixed gas prepared by adding either 0.5 to 4 vol % of oxygen gas or 1 to 6 vol % of carbon dioxide gas to an inert gas is used as the shield gas (24).

Abstract: An outer gas for plasma welding of the present invention is used in plasma welding of a stainless steel with use of a plasma welding torch in which an insert tip (2) is provided in the periphery of a tungsten electrode (1), a shield cap (3) is provided in the periphery of this insert tip (2), a front end part of the tungsten electrode (1) is located inside from a front end part of the insert tip (2), a center gas comprising an inert gas is allowed to flow into a gap between the tungsten electrode (1) and the insert tip (2), and the outer gas is allowed to flow into a gap between the insert tip (2) and the shield cap (3), wherein the outer gas is a mixed gas containing 0.5 to 2% by volume of a carbon dioxide gas with the balance of an inert gas.

Abstract: The shielding gas for MAG welding according to an embodiment is a shielding gas for MAG welding to perform narrow gap welding of a high Cr steel containing 8 wt % to 13 wt % of Cr with one layer-one pass by using a solid wire containing 8 wt % to 13 wt % of Cr, and the shielding gas for MAG welding comprises a ternary mixed gas of 5% by volume to 17% by volume of a carbon dioxide gas, 30% by volume to 80% by volume of a helium gas, and a balance of an argon gas.

Abstract: An outer gas for plasma welding of the present invention is used in plasma welding of a stainless steel with use of a plasma welding torch in which an insert tip (2) is provided in the periphery of a tungsten electrode (1), a shield cap (3) is provided in the periphery of this insert tip (2), a front end part of the tungsten electrode (1) is located inside from a front end part of the insert tip (2), a center gas comprising an inert gas is allowed to flow into a gap between the tungsten electrode (1) and the insert tip (2), and the outer gas is allowed to flow into a gap between the insert tip (2) and the shield cap (3), wherein the outer gas is a mixed gas containing 0.5 to 2% by volume of a carbon dioxide gas with the balance of an inert gas.

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 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: The present invention relates to a method and an apparatus for manufacturing keystone type superconducting compacted stranded wires. In manufacturing the keystone type superconducting compacted stranded wires, a large number of superconducting wires are stranded to form stranded wires, which are then roll-formed. The method and apparatus are configured so that, in the roll-forming, one side of the compacted stranded wires, which is thinner than the other side thereof after being roll-formed, comes into contact with one flat roll before the other side of the compacted stranded wires comes into contact with another flat roll. The method and apparatus are provided as another configuration wherein one flat roll to contact with the compacted stranded wires to be thicker is smaller in diameter than another flat roll to contact with the compacted stranded wires to be thinner.

Abstract: The present invention relates to a method and an apparatus for manufacturing keystone type superconducting compacted stranded wires. In manufacturing the keystone type superconducting compacted stranded wires, a large number of superconducting wires are stranded to form stranded wires, which are then roll-formed. The method and apparatus are configured so that, in the roll-forming, one side of the compacted stranded wires, which is thinner than the other side thereof after being roll-formed, comes into contact with one flat roll before the other side of the compacted stranded wires comes into contact with another flat roll. The method and apparatus are provided as another configuration wherein one flat roll to contact with the compacted stranded wires to be thicker is smaller in diameter than another flat roll to contact with the compacted stranded wires to be thinner.

Abstract: A method of manufacturing an aluminum-stabilized superconducting wire, which comprises the step of hot-extrusion-coating an entirety or a part of an outer circumference of a superconducting wire (11) which includes a superconducting filament embedded in a copper or copper alloy matrix, with a stabilizer (13) made of a precipitation-type aluminum alloy, is provided. The precipitation-type aluminum alloy is an Al—Ni alloy containing 100 to 25000 ppm of Ni, and the stabilizer made of the precipitation-type aluminum alloy is subjected, prior to the hot extrusion coating step, to an aging-heat treatment in which it is heated at a temperature of 250° C. to 500° C. for 10 minutes or more.