APPARATUS FOR CONTROLLING WELDING CURRENT AT MULTI-PASS WELDING Russian patent published in 2005 - IPC

FIELD: automatic control of electric arc gas-shield welding of dressed and angular seams under flux, particularly apparatuses for controlling welding current at multi-pass welding.

SUBSTANCE: output of power source of electric arc is connected to voltage pickup and to gas torch. Output of voltage pickup is connected to first inlet of fourth single-shot multivibrator. Output of second generator is connected to first inlet of second flip-flop and to second inlet of counter of welding torch zone position. Output of second flip-flop is connected to second inlet of fourth single-shot multivibrator whose outlet is connected to second inlet of second flip-flop, second inlet of third power amplifier and to third inlet of flaw counter. Output of first generator is connected to first inlet of second power amplifier and to first inlet of third power amplifier. Output of first power amplifier is connected to first ultrasound irradiator. Output of second power amplifier is connected to second ultrasound irradiator. Second outlet of first pickup of limit position of welding torch is connected to first inlet of counter of welding torch position zone. First inlet of first and second pickups of limit position of welding torch are connected to inlet of first single-shot multivibrator whose outlet is connected to inlet of second single-shot multivibrator, to inlet of step motor, to first inlet of digital switching circuit and to first inlet of memory register. Output of second single-shot multivibrator is connected to inlet of third single-shot multivibrator, to second inlet of second power amplifier. To second inlet of unit of first analog memory, to third inlet of flaw counter, to second inlet of first unit for controlling amplification factor. Output of third single-shot multivibrator is connected to second inlet of first power amplifier, to second inlet of unit of second analog memory, to second inlet of second unit for controlling amplification factor. First output of counter of welding torch position zone is connected to first inlets of first and second units for controlling amplification factor. Second output of counter of welding torch position zone is connected to inlet of first flip-flop and to inlet of pass counter. Output of first flip-flop is connected to third inlet of counter of welding torch position zone. Button "reset" is connected to second inlet of pass counter. Output of pass counter is connected to outlet of subtraction unit and to third inlet of digital switching circuit. Output of subtraction unit is connected to second inlet of digital switching circuit whose outlet is connected to second inlet of memory register. Output of first pickup for receiving ultrasonic oscillations is connected to first inlet of first amplifier having variable amplifying factor; output of said amplifier is connected to inlet of first rectifier whose outlet is connected to inlet of first smoothing filter. Outlet of said filter is connected to second inlet of differential amplifier. Output of third pickup for receiving ultrasonic oscillations is connected to first inlet of third amplifier with variable amplification factor whose outlet is connected to inlet of third smoothing filter. Output of said filter is connected first inlet of second differential amplifier. Output of fourth pickup for receiving ultrasonic oscillations is connected to inlet of fourth rectifier whose output is connected top second inlet of second differential amplifier. Output of first differential amplifier is connected to first inlet of first adder and to first inlet of first comparator. Output of first adder is connected to second inlet of unit of first analog memory whose outlet is connected to second inlet of first adder and to second inlet of first amplifier with variable amplification factor. Output of first unit for controlling amplification factor is connected to second inlet of second amplifier with variable amplification factor. Output of second unit for controlling amplification factor is connected to second inlet of third amplifier with variable amplification factor. Output of second differential amplifier is connected to first inlet of second adder and to first inlet of second comparator. Output of second adder is connected to second inlet of unit of second analog memory whose outlet is connected to second inlet of second adder and to second inlet of fourth amplifier with variable amplification factor. Output of reference voltage source is connected to second inlets of first and second comparators. Output of first comparator is connected to first inlet of OR-gate. Output of second comparator is connected to second inlet of OR-gate whose outlet is connected to second inlet of flaw counter. Output of said counter is connected to third inlet of memory register whose outlet is connected to first contact of switch. Second contact of switch is connected to zero wire; third contact of switch is connected to inlet of electric arc power source.

EFFECT: possibility for controlling welding current and detecting flaws at welding process, enhanced quality of welded joint at multi-pass welding.

1 cl, 1 dwg