| 摘要 |
PURPOSE:To execute high speed deep penetration welding and high speed cutting with an inexpensive device, by providing the electronic lens of a rotary symmetrical magnetic field type on the periphery of a welding arc and a plasma, and focusing the arc and the plasma. CONSTITUTION:For instance, in a conventional MIG welding device, an exciting coil 14 consisting of the iron core 13 of soft iron having a pole piece 12 is provided on the periphery of a shield nozzle 11 consisting of non-magnetism of the tip of a welding torch. To the exciting coil 14, a DC current is allowed to flow from an excitation power source 17 a magnetic field generated so as to surround the exciting coil 14 is collected to the gap part G of the pole piece 12, and arc (or a plasma) 4 is converged by a generated powerful magnetic field, and by utilizing the arc (or the plasma) 4 having a high energy density, high speed deep penetration welding is executed.
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