| 摘要 |
<p>A plasma torch is equipped with a preferably axial magnetic field in order to rotate the arc around the torch's centre axis. One or more bodies (4) of a ferromagnetic material are placed in or along the centre axis of the torch and with one end close to the arc's area of operation. The ferromagnetic body (4) will concentrate the magnetic field in the arc zone and if desired conduct the magnetic field from an area with a stronger axial magnetic field to the arc's area of operation.</p> |
