Taiyo Nippon Sanso Corporation

Hiroki Oono

Katsunori Wada

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 (), includes supplying an inert gas, as a pilot gas (), into the gap between a tungsten electrode () and an insert chip () at a flow rate of 2.1 m/sec or less, and supplying a shield gas () into the gap between the insert chip () and a shield cap (), 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 ().

Welding gas and plasma welding method

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 Sof the first shield gas is set in a range of 0.175 m/sec&#x2266;S&#x2266;1.75 m/sec, and a second shield gas is used wherein the gas is argon gas, and the flow rate Sof the second shield gas is set in a range of 0.05 m/sec&#x2266;S&#x2266;1.51 m/sec.

TIG welding method of ferrite stainless steel sheet

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 (A) which is installed in a switchable manner in a welding torch (A) having a single nozzle structure, the present invention includes an attachment (A) which is mounted to the torch body () in a state where the torch nozzle (inner nozzle) (A) 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 (A) that is mounted to the attachment (A) surrounding the periphery of the torch nozzle (A) and discharges a second shielding gas.

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Kai, Japan

Hiroki Oono