Electric heating – Metal heating – Of cylinders
Patent
1992-07-22
1993-06-29
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 95, 219 1077, 219110, H05B 606
Patent
active
052236838
ABSTRACT:
A high frequency welding system for tubular members applies high frequency current I to the gap for creating an alternating field. According to magnetic flux of the alternating field, an opposed current i is generated in a conductive portion of the welding apparatus. In close proximity, inductance is effected between the welding current I and the response current i. An output circuit is provided for generating high frequency current for establishing a welding heat with suppression of ripple current at the output. The welding processing is observed by a CCD camera which is in communication with an image processing portion for analyzing image data for determining welding conditions. A signal from the image processing portion is output to a monitoring portion which continuously monitors welding operation and activates an alarm if welding conditions exceed predetermined values. A correction processing portion also receives the signal from the image processing portion and effects adjustment of the power circuit for maintaining a welding heat at a desired level.
REFERENCES:
patent: 3573416 (1971-04-01), Drechsler
patent: 4357512 (1982-11-01), Nishimoto et al.
patent: 4492847 (1985-01-01), Masaki et al.
patent: 4798925 (1989-01-01), Ishizaka
patent: 4833381 (1989-05-01), Taft et al.
patent: 4877940 (1989-10-01), Bangs et al.
Kabushiki Kaisha Meidensha
Leung Philip H.
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