Electroslag vertical welding speed control

Details Electroslag vertical welding speed control Electroslag vertical welding speed control

B - Operations, Transporting

23

K

327/42

B23K 9/02 (2006.01) B23K 25/00 (2006.01)

Patent

CA 1049624

ELECTROSLAG VERTICAL WELDING SPEED CONTROL ABSTRACT An improved vertical electroslag welding system wherein the driving motor which propels the molding shoes is controlled by varying its speed in response to electrode current thereby assuring a molten puddle which for any set speed will not rise over the cavity wall or become too fluid. The motor is remotely controlled by a control circuit which is arranged so that the welding current is not directly coupled to the circuit. The control circuit includes, for example, an operational amplifier having its input connected across a shunt resistor for sensing the magnitude of the welding current, a pulse transformer having input and output windings and a relaxation oscillator having an output connected in series with the input winding of the pulse transformer and the output of the operational amplifier. Any change in the welding current produces a corresponding change in the alternating signal at the output winding of the pulse transformer. This signal is rectified to produce a DC control signal which is then fed to the motor governor.

241998

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