| 摘要 |
Apparatus for reducing the strength of an ambient magnetic field in a weld region comprises a magnetic field generator (50, 52, 54, 56) for generating an opposing magnetic field in the weld region in response to an input current, a magnetic field sensor (140) for sensing the direction and the magnitude of an ambient magnetic field in any vector direction in the weld region and outputting a sensor signal in response thereto, and a controller (7) arranged to receive the sensor signal and control the input current to the magnetic field generator in response to the sensor signal so as to generate the opposing magnetic field which reduces the magnetic field in the weld region. Methods for reducing the magnetic field in a weld region using apparatus of this form are also provided.
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