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Mar 21, 2013 at 14:35 comment added Rocketmagnet @OlinLathrop - Inductive heaters often adjust their frequency dynamically. I assume this is to achieve resonance despite changing characteristics of the object being heated. See this interesting teardown.
Mar 21, 2013 at 12:05 comment added Olin Lathrop Radio pretty much always envolves resonance because you are interested in a narrow band around a specific frequency. I'm not sure about welding, but inductive heating doesn't necessarily rely on resonance. A inductive heater is basically a high power transformer primary. The stuff being heated is conductive, so becomes a single-turn secondary. Resonance is not necessary, and will take some tweaking to achieve since the load characteristics can vary.
Mar 21, 2013 at 11:37 history answered pjc50 CC BY-SA 3.0