| 摘要 |
<p>Apparatus for reducing the strength of magnetic fields in a vicinity of weld zone in a workpiece to be welded includes a Hall effect sensor (7) for sensing the strength of the resultant magnetic field in the weld zone vicinity, and a magnetic field generator (5) responsive to the output signals from the Hall effect sensor (7) to generate a counterbalancing magnetic field in the weld zone vicinity so as to reduce the resultant magnetic field in the weld zone vicinity.</p> |
