H - Electricity – 05 – B
Patent
H - Electricity
05
B
327/17
H05B 6/10 (2006.01) B23K 13/00 (2006.01) B23K 13/02 (2006.01)
Patent
CA 1066783
ABSTRACT OF THE DISCLOSURE For welding pipeline pipe in the low ambient temperatures, encountered in extreme latitudes that may range from + 32°F to - 70°F and possibly lower, the induction heating of the pipe in the area of the weld joint prior to welding and at selected other times such as while the weld is being made, during quenching and for normalizing. A split-ring pancake induction heater is used comprising a pair of separable jaws that may be opened for lateral application to the pipe and closed to circumferentially embrace the same and wherein each of the jaws constitutes a separate induc- tor. Unlike the welding difficulties that would be caused by a ring induc- tor, the split-ring nature of the present inductor tends to break up unwanted eddy currents giving improved weld disposition quality and production speed. The unit is self-contained and readily movable along the pipe-line route. This method of induction heating comprises the steps of preheating the pipe in the area of the weld joint and heating it while the weld is being made. It provides also for further heating during the quenching and heating for normalizing.
242851
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