| 摘要 |
PURPOSE:To stabilize a MIG arc by combining plasma welding equipment with MIG welding equipment and allowing to contain a MIG electrode in a plasma electrode to envelop the MIG arc in a plasma arc. CONSTITUTION:The plasma electrode 37 of the plasma welding equipment 33 is hollow-shaped and the MIG electrode 43 is arranged coaxially therein via an insulating cylinder 49. Plasma gas 51 is supplied to the inside of this insulating cylinder 49. Furthermore, a chip 39 is arranged to the outside of the electrode 37 via an insulating cylinder 53. Said chip 39 is provided so as to cover the whole electrode 3. The outside of the chip 39 is surrounded by an external cylinder 55 and shielding gas 57 is supplied between the external cylinder 55 and the chip 39. A plasma power source 41 impresses the positive voltage on the electrode 37 and impresses the negative voltage on the chip 39 via a switch 59 and also impresses the negative voltage on base metal 60. A MIG power source 47 is connected with the MIG electrode 43 and the base metal 60 and impresses the positive voltage on a MIG wire 45 via the MIG electrode 43 and furthermore, impresses the negative voltage on the base metal 60. The MIG arc 65 is generated in the plasma arc 61 and maintained in a state being enveloped by the plasma arc 61.
|
