| 摘要 |
PURPOSE:To improve the workability, quality and efficiency of welding by feeding alternately and pulsatively a welding wire and a shield gas to the center of a welding arc from the inside of a tungsten hollow electrode in case of TIG welding, and heating the welding wire on the way of feeding. CONSTITUTION:In case of TIG welding, a welding wire 13 and shield gases 19, 20 are fed pulsatively and alternately to the center of a welding arc from the inside of a hollow tungsten electrode 11. By the shield gas 20, the welding wire 13 is prevented completely from being oxidized, and a weld zone is also air-sealed together with an outside shield gas 22. Also, by a center ejected gas 19, the welding direction can be converted freely. Moreover, when the welding wire 13 is heated on the way of feeding, the welding speed becomes higher. Accordingly, the workability, quality and the efficiency of welding are improved. |
