| 摘要 |
PURPOSE:To improve the welding efficiency and to reduce the heat loss by directing an arc to the welding aiming part at all times by providing the magnet integrally moving with an electrode and wrapping the aiming part with the inert gas fed from an elliptic discharging space. CONSTITUTION:The DC positive polarity TIG arc welding with the electrode 2 side as a cathode and a welding base metal 15 as an anode is performed. Magnets 6, 7 are integrally provided on an electrode nozzle 2 and the discharging space 9 of the electrode nozzle 2 is formed in the elliptical shape having a major axis 13 in the welding direction 12. The TIG welding is performed with a small electrode 2 and an arc 18 is always directed for a welding aiming part 10 with the magnetic line of the magnets 6, 7. The welding part 10 is always wrapped by the inert gas fed from the elliptical discharging space 9. In this way, the oxidation of the weld zone and the flow of the arc 18 can be prevented, so the welding speed can be increased. Consequently the welding efficiency is improved and the heat loss is reduced.
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