Solid state HF welder is a typical example of induction heating

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.