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| Number | Title | Issue Date |
| 7351932 | Method and apparatus for welding with voltage control A method and apparatus for providing welding-type power includes an input circuit, a switched circuit connected to the input circuit, and an output circuit connected to the switched circuit. A controller controls the system output in response to a setpoint and an ou... | 04/01/2008 |
| 7351931 | Switching power supply apparatus and electronic device using the same Provided is a switching power supply unit which uses a multilayer board or a stack of planar conductors as the windings of transformers so as to reduce the volume of the transformers and to have high efficiency, small size and small noise. The switching power supply... | 04/01/2008 |
| 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 |
| 7271365 | System and method for pulse welding Systems and methods are provided for pulse welding, in which a welding signal is provided to an electrode in series of pulse welding cycles, where the amount of energy applied to the electrode in each cycle is determined and a pulse is provided to initiate a transfe... | 09/18/2007 |
| 7217904 | Electric arc welder and method for controlling the welding process of the welder An operating system is provided for an electric arc welder including a high switching speed inverter power source for creating an arc voltage and arc current between an electrode and a workpiece. This operating system regulating the arc voltage to provide a voltage ... | 05/15/2007 |
| 7208697 | System and method for monitoring and controlling energy usage A welding control system to monitor the energy consumption of a plurality of welders. The welding control system controls the operation of one or more welders based upon the energy information received from one or more energy monitoring devices. ... | 04/24/2007 |
| 7115834 | Method and apparatus of electronic selection of an output mode of a welding power source The present invention provides a method and apparatus of electronically selecting an output mode of a welding power source. The invention includes operational circuitry that electronically energizes an output terminal based on a user selected parameter. Specifically... | 10/03/2006 |
| 7109439 | Short circuit arc welder and method of controlling same An electric arc welder operated to perform a short circuit welding process between an electrode and a workpiece, where the process comprises a succession of alternate short circuit conditions and arc conditions, with a first current waveform during the short circuit... | 09/19/2006 |
| 7109437 | Electric ARC welder with background current An electric arc welder comprising a power source driven by a main input transformer with a secondary winding creating an output pulsating current across the electrode and workpiece of a welding operation is provided with a background current circuit including a full... | 09/19/2006 |
| 7105776 | Method and apparatus for welding with start control A method and apparatus for providing welding power with a start control is disclosed. The welding power supply includes a source of welding power, a wire feeder and a controller. The source of welding power has at least one power control input, and provides welding ... | 09/12/2006 |
| 7091449 | Voltage regulated MIG welding using a constant current power source A system and method of duplicating CV mode of operation with a CC power includes a wire feeder designed to automatically adjust the speed of which consumable wire is delivered to a weld so as to maintain a target voltage set by a user. The wire feeder is designed to... | 08/15/2006 |
| 7060935 | Power supply for electric arc welding A power supply connectable to a source of AC line voltage for AC electric arc welding by an AC arc current across a welding gap between an electrode and a workpiece, the power supply comprises a high capacity transformer that converts said line voltage to an AC outp... | 06/13/2006 |
| 7049545 | MIG welding machine having 115V inverter The present invention is directed to a MIG welding machine having a 115 volt inverter. Incorporation of the 115 volt inverter into the MIG welding power source reduces the weight of the power source thereby increasing its portability. The power source may include a ... | 05/23/2006 |
| 7041937 | Wire feeder operable with lower minimum input voltage requirement The present invention is directed to a power supply that maintains power supply to a plurality of electronic components of a welding system when an arc voltage falls below approximately 15 volts. The invention includes a power supply having a secondary supply circui... | 05/09/2006 |
| 6998807 | Active sensing and switching device An active sensing and switching device for use in controlling current to a load, comprising a controller means (U1) for disconnecting the load from a power source by providing a switch-open control signal based on a signal indicating a sensed value of electri... | 02/14/2006 |
| 6995338 | Method and apparatus for short circuit welding A method and apparatus for short circuit welding includes providing welding power suitable for short circuit welding, sensing the stick out length, and adjusting the welding speed, such as wire feed speed or travel speed, adjusting a welding parameter, or adjusting ... | 02/07/2006 |
| 6956750 | Power converter controller having event generator for detection of events and generation of digital error A power converter comprises an event detection module detecting various events of the power converter in real time at the switching frequency of a switch in the power converter according to predetermined criteria. A pulse generator generates control signals for cont... | 10/18/2005 |
| 6944033 | Multi-phase interleaving isolated DC/DC converter A converter has a transformer with primary and secondary windings each having n coils in a series-series arrangement connected to primary and secondary sides. The primary side has n primary legs each having a top switch and a bottom switch and connected to the prima... | 09/13/2005 |
| 6944780 | Adaptive voltage scaling clock generator for use in a digital processing component and method of operating the same There is disclosed clock control circuitry for selectively applying a clock signal to a digital processing component wherein the clock signal is capable of being changed to a plurality of operating frequencies. The clock control circuitry is operable to (i) receive ... | 09/13/2005 |
| 6909067 | Method and apparatus for welding with CV control A method and apparatus for welding is disclosed. The output is preferably a cyclical CV MIG output, and each cycle is divided into segments. An output parameter is sampled a plurality of times within one or more of the segments. The CV output is controlled within th... | 06/21/2005 |
| 6906284 | Arc welding method The present invention relates to an arc welding method in which generation of spatters can be suppressed while the use quantity of gas to be supplied to a welding portion can be decreased. A welding wire 8 is brought into contact with a work W while applying ... | 06/14/2005 |
| 6899261 | Method and arrangement for a martensite-free brazing process An apparatus for brazing a connecting piece of electrically conducting material such as metal, to a metal surface by means of a new type of temperature-controlled brazing whereby for certain types of material a brazing is obtained that is free of martensite formatio... | 05/31/2005 |
| 6870132 | Power supply for electric arc welding A power supply connectable to a source of AC line voltage for AC electric arc welding by an AC arc current across a welding gap between an electrode and a workpiece, the power supply comprises a high capacity transformer that converts said line voltage to an AC outp... | 03/22/2005 |
| 6730875 | System and method for estimating true heats of welding processes An arc welding apparatus (10) for performing a waveform-controlled arc welding process includes an arc welding torch (14) that interacts with an associated weld. A power supply (12) applies a selected waveform-controlled power to the welding loa... | 05/04/2004 |
| 6713708 | Portable drawn arc stud welding apparatus and method providing high current output in short time intervals A stud welder utilizing a frequency inverter which is capable of delivering in access of 1000 A for a short duration of about 1 second using double-sided cooled power semiconductors. The inverter can deliver constant power to the stud circuit or the arc, sense the p... | 03/30/2004 |
| 6660965 | Welding assessment An apparatus and process for determining whether a fault has occurred in a welding process while the process is under way. The invention is applicable to welding and cutting processes where there is an arc plasma, such as gas-metal arc welding, tungsten-i... | 12/09/2003 |
| 6600134 | Power supply for electric arc welding A power supply connectable to a source of AC line voltage for AC electric arc welding by an AC arc current across a welding gap between an electrode and a workpiece, the power supply comprises a high capacity transformer that converts said line voltage to... | 07/29/2003 |
| 6570131 | Electric arc welder with arc starter In a standard electric arc welder of the type having a main power supply with an off condition directing no current across an electrode and a workpiece and an on condition directing welding current between the electrode and the workpiece and through a cho... | 05/27/2003 |
| 6512200 | Welding control system A system 11 for controlling an arc welding system 10 operating in a dip transfer mode is disclosed. The control system is operative to control the current output from a power source so as to apply a current pulse during the arcing phase of the welding sys... | 01/28/2003 |
| 6504738 | Freewheeling current conduction in welding power supply A power circuit for a welding power supply includes a rectifier circuit and a control circuit. The rectifier circuit includes a plurality of switches (e.g., silicon-controlled rectifiers). The control circuit is configured to provide a first control signa... | 01/07/2003 |
| 6504132 | Electric arc welder for variable AC input An electric arc welder with a variable AC voltage input of up to 600 VAC and a rectifier to provide a DC link, a driven high frequency boost stage with first and second leads connected to the DC link. The boost stage comprises an inductor, a first series ... | 01/07/2003 |
| 6498321 | System and method for controlling an electric arc welder A control system for an electric arc welder performing a welding process between an electrode and a workpiece, which system comprises: a high speed switching type power supply with a controller operated at a switching frequency of at least about 10 kHz wi... | 12/24/2002 |
| 6476354 | Method for controlling a welding apparatus and corresponding control device The invention describes a method of controlling a welding unit (1) and a current source (2), in which various welding parameters, such as a welding current, a welding wire diameter, a welding method etc., for example, can be set by a user from an input an... | 11/05/2002 |
| 6388233 | Method and apparatus for arc welding with melting electrode The invention comprises a method and an arrangement for pulsed gas metal-arc welding with an electrode fed to the welding site continuously at a given rate, the fusion conditions being adapted in such a manner that the material transfer from the electrode... | 05/14/2002 |
| 6388232 | Starting and welding device for DC TIG welder and method of operating same A DC TIG welder operable at a set low current level under about 5 amperes in a welding circuit including an electrode separated from a workpiece by a gap, the welder having an output welding current adjustable above the low current and driven by a constan... | 05/14/2002 |
| 6365874 | Power supply for electric arc welding A power supply connectable to a source of AC line voltage for AC electric arc welding by an AC arc current across a welding gap between an electrode and a workpiece, the power supply comprises a high capacity transformer that converts said line voltage to... | 04/02/2002 |
| 6333489 | Welding power supply with reduced OCV A method and apparatus for providing welding power includes controlling a phase controlled power circuit to provide a reduced OCV output. Preferably, the output is controlled in response to feedback, such as current being less than or greater than a thres... | 12/25/2001 |
| 6310320 | Dual operator phase control engine driven welder A method and apparatus for providing welding power includes two power sources (first and second), each having an output. A linking circuit selectively connects the power sources in one of an independent mode (such that each is connected to a separate weld... | 10/30/2001 |
| 6310321 | Engine driven inverter welding power supply A method and apparatus for welding with an engine driven inverter power supply includes generating an ac output with an engine and generator. The output is rectified and inverted to provide an ac inverter output. The engine is controlled using feedback in... | 10/30/2001 |
| 6278081 | Method and apparatus for producing welding power A method and apparatus for providing submerged arc welding power is disclosed. The power supply is AC/DC, and may be controlled in either a CV or a CC mode. The power supply includes a cycloconverter that provides a single phase output and receives a thre... | 08/21/2001 |
