| 摘要 |
A method of consumable electrode type gas shield arc welding characterized in that a shield gas consisting of an inert gas is fed toward a consumable electrode and an addition gas consisting of a mixture of oxidizing gas and inert gas toward an outer edge of welding pool. Further, there is provided a welding torch for use in the method. Thus, in the welding of steel material in accordance with GMA welding technique, the dissolved oxygen concentration of the weld metal can be reduced to 100 ppm or less, and while maintaining arc stability, desirable bead formation can be attained.
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