solid state HF welder is a typical example of induction heating.
Here we'd like to introduce equivalent circuit of Inductor & ERW steel pipe.
◆Tube wall inner current circuit & outer current circuit.
◆The ferrite rods influence to inner and outer circuit impedance.
◆Opening angle to the influence of the welding efficiency.
◆The position of the inductor to the influence of the welding efficiency.
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