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PRINCIPLES OF HIGH FREQUENCY INDUCTION …
Page 1 1997 Electronic Heating Equipment, of INDUCTION TUBE WELDINGPage 1 PRINCIPLES OFHIGH FREQUENCYINDUCTION TUBEWELDING ByJOHN WRIGHTE lectronic Heating Equipment, , WashingtonPage 2 1997 Electronic Heating Equipment, of INDUCTION TUBE WELDINGI ntroductionHigh FREQUENCY INDUCTION welding accounts for themajority of welded tubing produced worldwide, yetit is still a largely misunderstood process. Part of thereason is that the process is very forgiving, however athorough understanding of it can lead to higherproduct yields and of operationInduction welding is a form of Electrical ResistanceWelding (ERW) in which the large rotary trans-former common in low FREQUENCY ERW is replacedby a virtual transformer consisting of the work coil(primary winding) and the tube itself (secondarywinding). A ferromagnetic core inside the tube has asimilar role to the laminated iron core in a conven-tional flowing in the coil causes a magnetic field todevelop surrounding the coil, part of which intersectswith the open tube.
1997 Electronic Heating Equipment, Inc. PRINCIPLES of INDUCTION TUBE WELDING Impeders
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