System for and method of automatically controlling amount of inp

Details System for and method of automatically controlling amount of inp System for and method of automatically controlling amount of inp

1997-05-15

1999-03-30

Walberg, Teresa

Electric heating

Inductive heating

Metal working

219 615, B23K 1301

Patent

active

058892621

ABSTRACT:
A system and a method for automatically controlling an input heat amount of a high-frequency electric resistance welding machine. The automatic input heat amount control system includes a coil antenna for sensing a spark signal which is generated by electromagnetic waves produced on portions of an object to be welded, a spark signal processing unit for filtering a desired signal component of the spark signal sensed by the coil antenna, separating the filtered signal component into amplitude and frequency signal components and processing the separated amplitude and frequency signal components, an induction coil mounted on the object for generating melting heat, an oscillator for supplying high-frequency current to the induction coil, a welding machine controller for controlling the amount and frequency of current being supplied from the oscillator to the induction coil, a welding machine power controller for controlling the output of the welding machine controller, and a main controller connected to the spark signal processing unit and the welding machine power controller, for controlling the output of the welding machine power controller in response to a spark signal fed back from the spark signal processing unit to establish the optimum welding condition.

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