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    • 1. 发明专利
    • WELDING EQUIPMENT
    • JPH10249529A
    • 1998-09-22
    • JP5218097
    • 1997-03-07
    • HITACHI SHIPBUILDING ENG CO
    • KOYAMA MASAHIROIHARA HITOSHIOSAWA MORIHIKOKATO SHIGEYUKINAKAMOTO MIKIO
    • B23K9/16B23K9/00B23K9/095B23K9/167
    • PROBLEM TO BE SOLVED: To perform the weaving by providing a first nozzle to eject the first shield gas in the direction of the welding position along the outer circumference of an electrode, a second nozzle to eject the second shield gas along the outer circumference of the ejection flow of the first shield gas, and a third nozzle to eject the third shield gas toward a groove part along the outer circumference of the ejected flow of the second shield gas. SOLUTION: When the welding is performed while the TIG filler material 5 is fed from a wire touch 4, the first shield gas 12A is ejected in the direction of the welding position 3A along the outer circumference of an electrode 2 from a first nozzle 12 in a narrow gap 3B. Similarly, the second shield gas 13A is ejected along the outer circumference of the ejected flow of the first shield gas 12A from a second nozzle 13 is a narrow gap 3B, and the third shield gas 14 A is ejected so as to surround the second shield gas. The sealability is improved by the first shield gas 12A to reduce the amount of the ejected gas from the third nozzle 14, the size of the third nozzle 14 is reduced, and the view field of the welding position 3A is expanded to improve the workability and to realize the excellent welding.