| 摘要 |
PURPOSE: A gas tungsten arc welding method and steel manufactured thereby are provided to perform welding with a high speed without deterioration of machinability of steel by using inert gas including 10-20 mass% of hydrogen gas as a protection gas and using inert gas including 1-5 mass% of oxygen gas as back shielding gas. CONSTITUTION: A gas tungsten arc welding method includes the following steps. Protection gas and back shielding gas are provided to steel(100) and the steel is welded. The gas tungsten arc welding method uses inert gas including 10-20 mass% of hydrogen as the protection gas. The gas tungsten arc welding method uses inert gas including 1-5 mass% of oxygen as the back shielding gas. The steel is one of hot-rolled steel plate, cold-rolled steel plate and stainless steel plate. The stainless steel plate includes 11-18% of Cr and less than 150 ppm(exclusive of 0) of C+N in wt%. [Reference numerals] (AA) Protection gas; (BB) Gas back shielding
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