| 摘要 |
PURPOSE:To improve welding efficiency by performing TIG welding while rotating a non-consumable electrode arc around the axial center of a consumable electrode thereby preventing generation of spatter and permitting the use of O2-free shielding gas for high grade steel. CONSTITUTION:An electrode nozzle 1 is rotated around its axis at a constant speed by a motor 4 and a shielding gas nozzle 5 circumscribes the same. A TIG electrode 6 is attached in parallel in the lower part of the nozzle 1 in the position deviated from the axial center thereof and the electrode 6 is rotated around the axial center by the rotation of the nozzle 1. A nozzle hole 7 is provided at the axial center of the nozzle 1 and a welding wire 8 passed through the hole 7 is fed at a constant speed while receiving the conduction of current together with the electrode 6 via the nozzle 1. The TIG arc 11 by the electrode 6 and the MIG arc 12 by the wire 8 are generated between the weld zones 10 of welding base metal 9, and these arcs are generated within the shield of the inert gas such as Ar ejected from the nozzle 5. |
