Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Koji Nakamura0
Yutaka Kimura0
Toyoyuki Satou0
Hidetoshi Fujii0
Kiyoshi Nogi0
Shanping Lu0
Date of Patent
March 29, 2011
Patent Application Number
11673983
Date Filed
February 12, 2007
Patent Citations Received
Patent Primary Examiner
Patent abstract
The TIG welding methods of the present invention include generating an electric arc between an electrode and an object to weld the object, wherein a first shielding gas including an inert gas flows toward the welded object surrounding the electrode, a second shielding gas containing an oxidative gas flows toward the welded object along a periphery of the first shielding gas, and the concentration of the oxidative gas in the second shielding gas is set such that the oxygen concentration in the welded metal portion of the welded object is within a range of 70 to 220 wt. ppm.
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