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| Number | Title | Issue Date |
| 7371990 | Cable monitoring system and monitoring method thereof A cable monitoring system, which monitors failure of a plurality of cables connecting a power supply and a welding gun, has voltage detection lines connected to arbitrary two points of each of the cables, an insulating transformer a primary side of which is connecte... | 05/13/2008 |
| 7339134 | Extension lift truck modification An apparatus for welding, including a lift mechanism for lifting a personnel platform attached to an end of the lift mechanism, a drive system for moving the apparatus, where the drive system includes a DC power source, a set of controls mounted on the platform for ... | 03/04/2008 |
| 7330008 | Apparatus for sensing position of vehicle seat An apparatus for detecting a vehicle seat position is disclosed. The apparatus includes a hall sensor for detecting a target position according to a flux variation; a first power-supply unit for activating the hall sensor in an active period of a received drive-volt... | 02/12/2008 |
| 7289862 | Methods to support process quality and maintenance during control of an industrial process such as welding A number of methods to support process quality and maintenance during control of an industrial process such as welding are provided. The methods provide, among other things: automatic process limit programming based on runtime data; user-initiated process limit prog... | 10/30/2007 |
| 7254046 | DC-DC converter In a DC to DC converter, first and second primary windings are magnetically coupled to a first secondary winding. Third and fourth primary windings are magnetically coupled to a second secondary winding. The first and second primary windings are magnetically coupled... | 08/07/2007 |
| 7183516 | System and method for welding with multiple arcs A system and method for welding with a first and second arc between a first and second electrode, respectively, and a common workpiece, where each of the electrodes is driven by a single power source, where there is a first inductor connected in series with the firs... | 02/27/2007 |
| 7180029 | Method and system for a remote wire feeder where standby power and system control are provided via weld cables The present invention is directed to a remotely controlled welding machine that uses serializing and modulating circuits to transfer modulated data packets to a welding power source across a weld cable. A transmitter transmits the data packets of desired welding ope... | 02/20/2007 |
| 7091445 | Electric arc welder and method for controlling the welding process of the welder Electric arc welder (10) performs a given weld process with selected current waveform performed between electrode (24) and workpiece (26). Welder (10) includes a controller with a digital processor (30), sensor (44) for read... | 08/15/2006 |
| 7041936 | Method for connecting several welding devices and corresponding welding device The invention relates to a method of linking several current sources, in particular several welding devices (1; 27; 28), plasma current sources or similar. Operating individually and independently of one another, a process control and/or regulating system ( | 05/09/2006 |
| 6995337 | Power source with saturable reactor In a power source for an electric arc welder including an inverter having two primary circuits connected in a series circuit across the DC bus of an input rectifier where each primary circuit comprises a capacitor parallel with a primary winding section and a switch... | 02/07/2006 |
| 6797922 | Power supply apparatus for welder A power supply apparatus for a welder includes a rectifier (104) and a smoothing reactor (106) which operate together to convert a commercial AC supply voltage to a DC voltage. The DC voltage is converted to a high-frequency voltage by an inverter (... | 09/28/2004 |
| 6649869 | Method and system for welding with paralleled power supplies A method and system for welding with a plurality of welding power supplies connected in parallel. The system includes a first power supply and a second power supply. A reference signal indicative of a welding output of the first power supply is provided t... | 11/18/2003 |
| 6566625 | Welding apparatus and method The invention provides a plasma welding or brazing process in which a direct current pilot arc is maintained throughout the process. The process comprises the steps of setting a pilot arc power supply (6) to a relatively high level, generating a high volt... | 05/20/2003 |
| 6501049 | Short circuit arc welder and method of controlling same An electric arc welder operated to perform a short circuit process with a first waveform controlling a short condition followed by a second waveform controlling an arc condition, wherein the welder includes a comparator to create an arc signal when the sh... | 12/31/2002 |
| 6472633 | Method and system for welding with paralleled power supplies A method and system for welding with a plurality of welding power supplies connected in parallel. The system includes a first power supply and a second power supply. A reference signal indicative of a welding output of the first power supply is provided t... | 10/29/2002 |
| 6369350 | Plasma-arc torch system with pilot re-attach circuit and method A plasm-arc torch system, a circuit, and a method for controlling a pilot arc. A rate of change sensor, such as a dv/dt sensor, monitors the output of an error amplifier to determine whether to close a switch to re-attach a pilot arc before a transferred ... | 04/09/2002 |
| 6268587 | Current feedback device for electric arc welder In an electric arc welder including a main transformer with a primary stage coupled to a secondary stage in which is created an AC output current, a first switch opened and closed at a given rate to pass a series of first pulses of DC current in a first c... | 07/31/2001 |
| 6194681 | Power supply apparatus for arc-utilizing machine A DC voltage resulting from rectifying and smoothing a commercial AC voltage is converted into a high-frequency voltage in an inverter which is operated in response to the closure of a start switch. A transformer transforms the high-frequency voltage, and... | 02/27/2001 |
| 6091049 | Power supply apparatus for use with arc utilizing device A power supply apparatus for use with an arc utilizing device includes capacitors coupled in series between outputs of a rectifying unit, and inverters each of which is coupled across a respective one of the capacitors. Each inverter converts a DC voltage... | 07/18/2000 |
| 6051806 | Power supply apparatus for welders and method of manufacturing same A power supply apparatus for welders includes an input-side AC-to-DC converter for converting an input commercial AC voltage into a DC voltage, which is, in turn, converted to a high-frequency voltage in an inverter. The high-frequency voltage is transfor... | 04/18/2000 |
| 5844197 | Arc retract circuit and method An arc retract circuit for use in a plasma arc system with a torch having an electrode and a nozzle, a power supply for providing a D.C. current, a power circuit for connecting the power supply across said electrode and a workpiece to be cut, a power swit... | 12/01/1998 |
| 5811757 | Power source including parallel switching circuits and related methods for a welding or cutting system A power source for a plasma cutting tool includes first and second power switching circuits and a controller. Each power switching circuit includes a switch for switching electrical power to a respective output, and the outputs of the power switching circ... | 09/22/1998 |
| 5751568 | Power supply apparatus for arc-utilizing equipment A power supply apparatus for arc-utilizing equipment includes a first converter for converting a received AC voltage to a DC voltage. An inverter converts the DC voltage to a high-frequency voltage, which is applied to a voltage-transformer with primary and se... | 05/12/1998 |
| 5683602 | Welding power supply A power supply for supplying a substantially square wave of current to a welding arc and including a source of A.C. power having a succession of positive and negative portions forming an input voltage cycle; first switch means for initiating a positive ou... | 11/04/1997 |
| 5648007 | Method of performing arc welding between optical fibers The method of arc welding optical fibers includes a fusion and inter-penetration first step during which the ends subjected to the arc are fused and caused to inter-penetrate, and an alignment second step so as to continue the fusion under the control of ... | 07/15/1997 |
| 5570254 | Method and device for preventing excessive currents in a welding converter A method for preventing excessive currents in a welding converter that, by use of power semiconductors, generates a two-phase, pulse-width-modulated a.c current from a rectified mains a.c. current supplied to the primary side of a welding transformer. The... | 10/29/1996 |
| 5528013 | Method of automatically adjusting welding conditions for an arc welding robot A method, such that, using known data, a relationship between a target welding current and a welding current command to be instructed to a welding machine to achieve the target welding current is estimated by a linear formula. Then, a welding current comm... | 06/18/1996 |
| 5463197 | Apparatus and method for forming wire bonding ball A ball forming apparatus free from parameter variations introduced in setting spark discharge control parameters wherein the variations may be largely of operator-dependent or apparatus-dependent nature. To control discharge parameters, digital data for c... | 10/31/1995 |
| 5457300 | Consumable electrode DC arc welder An inverter controlled DC arc welder of consumable electrode type includes an input rectifier for rectifying AC input power, an inverter for converting the rectifier output to high frequency AC power, an output transformer for stepping down the inverter o... | 10/10/1995 |
| 5349157 | Inverter power supply for welding A high frequency power supply for supplying a yielding current through a choke to a welding station including an electrode element and a workpiece element, wherein the power supply includes a transformer means for creating a first current pulse in a first... | 09/20/1994 |
| 5250786 | D-C arc welding apparatus A d-c arc welding apparatus including an engine-driven welder converting the a-c power generated by an engine-driven alternator into d-c power for use as the drive power of the welder, a battery-driven welder using a battery as the drive power of the weld... | 10/05/1993 |
| 5220151 | Power source apparatus for an alternating-current arc welding capable of supplying an alternating-current welding current having any waveform There is disclosed a power source apparatus for an alternating-current arc welding. In the power source apparatus, a reference signal generator periodically generates a reference signal having a predetermined waveform, and a direct-current power source ou... | 06/15/1993 |
| 5218182 | Constant current welding power supply with auxilary power source to maintain minimum output current levels An auxiliary power supply is connected through a fast acting switch to the output of a regulated, constant current welding power supply. A current sensing circuit monitoring the output current level actuates the fast acting switch whenever the current lev... | 06/08/1993 |
| 5149940 | Method for controlling and synchronizing a welding power supply A microprocessor-controlled arc welding power supply is disclosed. An silicon controlled rectifier ("SCR") bank is used to generate a direct current arc welding current under program control. Positive sychronization is provided by the microprocessor using... | 09/22/1992 |
| 5017756 | Method and apparatus for preventing chain reaction transistor failure in paralleled transistors An improved electronic welding station is disclosed. The welding station provides for an improved arc striking capability by providing a higher arc striking voltage and a large arc striking current and, once the arc is struck, automatically switches over ... | 05/21/1991 |
| 4929811 | Plasma arc torch interlock with disabling control arrangement system A plasma arc torch system includes a fault detect circuit for sensing a short between the electrode and the nozzle and disabling the power supply when the short is sensed. A sensing circuit within the torch cable is provided for actuating the fault detect... | 05/29/1990 |
| 4897522 | Output control circuit for inverter A control circuit is provided for the output of a high frequency inverter of the type having an output transformer with a core, primary windings and a secondary winding with two sections for creating a first secondary current pulse of electrical current i... | 01/30/1990 |
| 4896018 | Method and apparatus for protecting a power transistor from excessive current flow An improved electronic welding station is disclosed. The welding station provides for an improved arc striking capability by providing a higher arc striking voltage and a large arc striking current and, once the arc is struck, automatically switches over ... | 01/23/1990 |
| 4785149 | Distributed station welding system An improved welding system is shown. A single high capacity power supply (10) provides operating power for several weld selector stations (16). Each weld selector station (16) operates independently, is adjustable, and allows a welder to obtain the voltag... | 11/15/1988 |
| 4716274 | Distributed station welding system An improved welding system is shown. A single high capacity power supply (10) provides operating power for several weld selector stations (16). Each weld selector station (16) operates independently, is adjustable, and allows a welder to obtain the voltag... | 12/29/1987 |
