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Match Document Document Title
8304683 Seam welding apparatus and seam welding method  
A seam welding apparatus and a seam welding method perform a seaming process on workpieces of various shapes having flange sections, by preventing a welding track formed by upper and lower rotary...
5869800 Phase distortion compensated time base for a welder control  
A phase controlled weld controller system provides a stable timebase phase reference which has improved transient response in the presence of spurious noise generated by other external equipment...
5821491 Multiple single phase weld control systems coupled to a polyphase power source  
A weld control system, supplied by a polyphase voltage source, consists of an isolation contactor supplying power to separate single phase weld controllers. The single phase weld control systems...
5760361 Multiple single phase weld control systems from a polyphase power source  
A weld control system, supplied by a polyphase voltage source, consists of multiple and separate single phase weld controllers. The single phase weld control systems have their separate power...
5607604 Apparatus for detecting voltage across thyristor in alternating-current resistance welding machine  
A thyristor voltage detector includes a current-limiting resistor having a high resistance (e.g., 30 kilo-ohm) and a switching device (e.g., photo MOS FET) of a switching photo coupler which are...
5585997 Hydrogen thyratron modulator  
A single resonant DC charging circuit provides both the power and timing for the pedestal insertion is, likewise, controlled by a single trigger circuit input and by a saturable reactor which...
4963707 Resistance welding control system  
A resistance welding control system is disclosed which comprises a resistance detection unit for detecting an interelectrode resistance by measuring welding current and voltage applied between...
4945201 Rack mountable weld controller  
A rack mountable weld controller for use as a plug in card within a rack of a programmable logical controller (PLC) system. All signals between the PLC and the weld controller are through the...
4885451 Automatic stepper for resistance welding  
A method is disclosed for controlling the magnitude of current delivered through welding electrodes to a workpiece to be welded using resistance welding techniques, in order to prevent weld...
4876431 Microprocessor welder controller  
A welding system controller for controlling the welding of a workpiece including a switch for selectively applying power to a welding transformer and a controller for controlling the power...
4851635 Method and apparatus for determining the power factor of a circuit  
Structure for and method of controlling the firing point of thyristors in a phase controlled contactor in a resistance welding circuit in accordance with variations in current line voltage and/or...
4745255 Method and apparatus for welding current regulation for a resistance welding machine  
A method and arrangement are described for regulating the welding operation in a resistance welding machine by sensing the welding current and controlling the welding time. A first integrator (20)...
4716267 Three phase high frequency spike welding system  
A resistance-type welder employing a three phase, pulsed power supply and a pair of opposed electrodes which a workpiece may be clamped under pressure, includes a microcomputer based control...
4700042 Device for controlling electrical resistance welding apparatus, particularly for controlling apparatus for welding parts of motor vehicles bodies  
In electrical resistance welding apparatus comprising two welding electrodes connected through respective supply cables to an electrical power supply which can generate welding current with...
4628176 Apparatus for setting schedules of a resistance welding machine  
Items constituting a resistance welding schedule are set to desired numerical values by pressing three kinds of keys, namely a shift key for designating one item after another, and increment and...
4560852 Spike welding system having improved power supply  
A power supply for a pulse type electrical resistance welder includes an A.C. source of electrical power, a firing circuit for delivering spikes of current to a pair of welding electrodes and a...
4532399 Apparatus and method of welding nails to wires  
An improvement in a method of welding the shanks of successive nails to a pair of wires to form a series of wire connected nails suitable for packaging and use in a power driven fastener driving...
4493040 Apparatus and method of phase control for resistance welding and other resistive-inductive loads  
A computer-controlled welding apparatus includes a phase-controlled resistance welding circuit (A) for selectively conducting pulses of a welding current to a workpiece (B) and a control circuit...
4490795 Apparatus for controlling and programming welding guns  
An apparatus for controlling and programming welding guns, constituted by a set of electronic component circuit boards enclosed in a casing provided with a keyboard and a programming and control...
4465918 Method for controlling welding current  
A method for controlling a welding current in a resistance welder which phase-controls an A.C. power supply voltage by a thyristor to control the welding current to a target value. Prior to...
4463244 Air core type current pulse and power factor monitoring and control system for a resistance welding apparatus  
A monitoring and control system for a resistance welding apparatus. The system monitors the quality of a weld as a weld is formed and terminates the welding current when a quality weld is...
4459457 Feedback welder control system  
A control system for resistance welders of the type in which welding current is supplied to a workpiece through a transformer. The system assures weld quality by monitoring the change in...
4459456 Feedback welder control system  
A control system for resistance welders of the type in which welding current is supplied to a workpiece through a transformer. The system assures weld quality by monitoring the change in...
4458132 Welding apparatus and control system therefor  
A resistance-type welder employing a pulsed power supply and a pair of opposed electrodes between which a workpiece may be clamped under pressure, includes a microcomputer based control system for...
4456809 Microprocessor-controlled controller for resistance welding machines  
A precision key pad controlled controller for a resistance welding machine is provided which may be set to deliver welding power to each of a multiplicity of welding operations on a precisely...
4442337 Method and system for dual control of resistance welding  
A method and system for controlling resistance welding whereby the preferred quality of resistance welding can be ensured automatically during the welding process by controlling the electrode...
4419559 Resistive welder having a controlled output voltage unaffected by secondary circuit disconnection  
A resistance welder is provided having an electronic contactor, a welding transformer coupled in series with the electronic contactor, and a secondary circuit with a welding load connected to the...
4387289 Control system for resistance welding  
A system for resistance welding in which the welding voltage between the electrodes is controlled by changing the pressure applied to the electrodes or the firing phase angle of the welding...
4306138 Power supply apparatus for resistance welder including means for preventing polarized transformer excitation  
A power supply apparatus for a resistance welder has an inverse-parallel thyristor circuit for constrolling the welding current. One of thyristors connected in inverse-parallel relationship is...
4301351 Modular microprocessor-controlled controller for resistance for resistance welding machines  
A precision resistance welding machine controller is provided which may be set to deliver welding power to each of a multiplicity of welding operations on a precisely controlled repeatable basis....
4289948 Automatic voltage compensation for digital welder control system  
An automatic voltage compensation control for a microprocessor controlled resistance welder system includes a digital voltmeter for measuring the line voltage cycle by cycle and associated...
4289951 Power factor monitoring and control system for resistance welding with line disturbance immunity  
A power factor monitoring and control system with line disturbance immunity for controlling the quality of spot welds made by resistance welding techniques such as those used in the automotive...
4230929 Control circuit for a welding device  
A control circuit for accurately controlling the duration of a welding operation. In a preferred embodiment the control circuit includes first and second connectors for connecting the control...
4158121 Spot welder control circuit  
A phase controlled regulating circuit for a portable spot welder having an output transformer, utilizes a normally saturated transistor across one diagonal of a diode bridge circuit to interrupt...
4132880 Seam welding method and apparatus  
A high speed seam welding system wherein single phase alternating current welding pulses are applied to electrode mechanism during only a less than maximum amplitude fractional portion of the wave...
4076974 Current control device and method  
A circuit for improved control of current for use in conjunction with an inductive load, for example, a transformer in a welding operation. The circuit of this invention is adapted to maintain the...
3816724 SYSTEM FOR WELDING CONTROL  
A control system for timing the occurrence and duration of functions occurring in a sequence in an industrial process, in which a single RC charging circuit initiates an output signal from a...
3723772 TENS AND UNITS TIMER FOR A WELDING SYSTEM  
A timing system for use in conjunction with a welding system, wherein the timing system consisting of separate tens and units counters, the counters being electronically controlled to select the...
3694615 WELDING CONTROL SYSTEM  
A firing control system for controlling the application of electrical energy to a welding load including sensing the power factor of the load and generating a firing curve having a fixed slope...
3676766 MULTIPHASE ALTERNATING CURRENT REGULATION SYSTEM FOR TRANSFORMER-COUPLED LOADS  
In a multiphase alternating current regulating system employing controlled rectifiers operated in accordance with phase commutation techniques, the improvement of circuitry for eliminating direct...
3670138 WELDING EQUIPMENT  
A welding apparatus including a pair of electrodes connected by elongated electrical conductors to a transformer and a circuit for controlling the duration and strength of the welding current. One...
3660693 ANALOG TENS AND UNITS TIMER WITH SOURCE SYNCHRONIZATION  
A timing system for use in conjunction with a welding system, wherein the timing system consisting of separate tens and units counters, the counters being electronically controlled to select the...
3622738 MULTIPHASE CONTROL CIRCUIT  
A heat control system for controlling the firing of the control elements, i.e., power-controlled rectifiers, in a welding system utilizing a single-control potentiometer to control the firing...
3597575 SOLID STATE HEAT CONTROL AND INITIATING CIRCUIT FOR A RESISTANCE WELDER CONTROL  
A solid state control for a resistance welder which will prevent false tripping of a solid-state logic memory in response to bounce of the contacts of an initiating switch which initiates and...
3588435 SOLID-STATE HEAT CONTROL AND INITIATING CIRCUIT FOR A RESISTANCE WELDER CONTROL  
3578941 SURGICAL ELECTRIC WELDING APPARATUS  
A surgical electric welding apparatus for interconnecting bone implantations, said apparatus comprising a transformer whose primary winding may be connected to an electric energy source, two...
3553416 WELDING EQUIPMENT  
A welding apparatus including a pair of electrodes connected by elongated electrical conductors to a transformer and a circuit for controlling the duration and strength of the welding current. One...
3553567 HIGH CURRENT SQUARE WAVE POWER SOURCE  
3526741 METHOD AND APPARATUS FOR WELDING STUDS  
1,155,339. Stud welding. GREGORY INDUSTRIES Inc. 30 Nov., 1967 [7 Dec., 1966], No. 54582/67. Heading B3R. [Also in Division H2] Apparatus for welding a stud 5 to a workpiece P comprises means for...
3526742 STUD WELDING  

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