Electric heating – Metal heating – Of cylinders
Patent
1988-08-26
1990-08-07
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 95, 219 1043, 219 1079, H05B 610
Patent
active
049474626
ABSTRACT:
Arrangement in connection with induction butt-welding of the aubstantially pipe- or bolt-shaped elements of metal, which are provided close to each other along substantially the same center axis, and which at their welding edges define a narrow gap or joint 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 rendering a concentrated heating area at the welding edges, a combination of a coil provided around the narrow gap and adapted for being subjected to a voltage in the frequency range of approximately 50-5000 Hz, and a cover of ferro-magnetic material provided around the coil and serving to guide the electromagnetic field to the area of the welding joint.
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