| 摘要 |
<p>Arrangement in connection with induction heating, especially for butt-welding of two substantially pipe- or bolt-shaped elements (11, 12) of metal, which are provided close to each other along substantially the same center axis, and which at their welding edges (14, 15) define a narrow gap or joint (13) which are kept approximately constant during the heating phase. For the purpose of achieving an electromagnetic field which can be guided into the area of the joint for thereby rendering a concentrated heating area at the welding edges, there is according to the invention suggested a combination of a coil (16) provided around the narrow gap (13) and adapted for being subjected to a voltage in the frequency range of approximately 50-5000 Hz, and a cover (17) of ferro-magnetic material provided around the coil (16) and serving to guide the electromagnetic field to the area of the welding joint (13).</p> |
