Induction heating method capable of improving quality of...

Details Induction heating method capable of improving quality of... Induction heating method capable of improving quality of...

H - Electricity

05

B

327/14

H05B 6/06 (2006.01)

Patent

CA 1046587

Abstract of the Disclosure A method for heating steel pipe by induction heating coils, while the pipe is travelling through said coils in the axial direction, which comprises: a) calculating the limit surface absorption electric power density PO(W/cm2) by the following formula: Image wherein T=heating temperature (°C) and d=wall thickness (mm); b) attaching a power supply to the induction heating coils c) setting said power supply so that surface absorption electric power density (P) of the steel pipe becomes greater than said limit surface absorption electric power density (PO)' and d) heating the steel pipe as it is travelling through said in- duction heating coils heated by said power supply, at such speed as to permit the steel pipe to be heated to the desired temperature, thereby causing the difference in temperature between the ends and the central portion of the steel pipe in the axial direction to be no greater than about 20°C.

234047

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