| 摘要 |
PROBLEM TO BE SOLVED: To execute the gas shield arc welding in a high efficiency by using a welding wire adding single or plural number among alkali metals, alkali-earth metals, alkali metal oxide, alkali metal fluoride and TiO2 while omitting a substrate treatment, when a position sticking and forming the impurities is welded. SOLUTION: Defective welded position 3 is developed on the inner surface side of the butt welded part 2 of mutual steel pipes in the existing pipe line 1, and in the defective welded position 3, the impurity 6 of fats and oils, etc., consisting essentially of rust and tar, the impurity 7 of slag, etc., and dislocation between both pipes 8 exist. Repair welding is applied with the welding wire 10 under remaining state of these defects. The welding wire adding single or plural number among the alkali metals, alkali-earth metals, TiO2, A12O3, MgO, ZrO2, Al, Si, CaCO3 and CaF3 is used while melting the substrate treatment to execute the gas shield arc welding.
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