Class / Patent application number | Description | Number of patent applications / Date published |
219130310 | Responsive to arc voltage only | 24 |
20080264915 | Welding power source with automatic variable high frequency - A high frequency power source configured to provide a variable voltage output is described such as for use in welding systems. The high frequency power source charges a capacitive storage device. A transformer having a primary winding coupled to the output of the high frequency power source and establishing a resonant frequency signal with the capacitive storage device, and a secondary winding coupled to the welding power supply, superimposes the resonant frequency signals onto the welding power signal of the welding power supply during periods of the resonant rings. By varying the voltage output from the high frequency power source, the high frequency energy delivered to the welding torch can be optimized for a variety of welding applications. | 10-30-2008 |
20080296276 | Welding-Type Power Source with Integrated Open-Circuit Voltage Controller - A welding-type system and method for operating a welding-type system is disclosed. The system includes a switched power delivery circuit connected to deliver power to output terminals and an open-circuit voltage (OCV) control circuit configured to adjust an operational state of the switched power delivery circuit. A controller is included that is configured to monitor the output terminals to identify an open circuit condition and selectively engage the OCV control circuit to adjust the operational state of the switched power delivery circuit to reduce a voltage of the output power delivered to the output terminals during the open circuit condition. | 12-04-2008 |
20100133250 | Welding method for carrying out a welding process - The invention relates to a welding method for implementing and monitoring a welding process, whereby a power source ( | 06-03-2010 |
20100213181 | Arc Start Control Method - An arc start control method comprises starting advance of a welding wire, and determining that a distal end of a welding wire contacts a base material and short circuit is caused. If a feed torque value is a reference torque value or greater, the welding wire is retracted and the distal end of the welding wire is separated from the base material without generating an arc. If the feed torque value is smaller than the reference torque value the welding wire is retracted and the distal end of the welding wire is separated from the base material and an initial arc is generated between the welding wire and the base material. | 08-26-2010 |
20110198330 | METHODS AND DEVICES FOR RESPONDING TO HIGH PRIMARY SUPPLY VOLTAGES OF WELDING SYSTEMS - Methods and devices for controlling a welding power source based on a primary supply voltage level are provided. One method may include sensing activation of the welding power source and sensing a primary supply voltage established on a control transformer of the welding power source. The method may also include establishing a substantial current draw from a primary power supply that exceeds a predefined current threshold when the sensed primary supply voltage exceeds a predefined voltage threshold. The substantial current draw may be adapted to trip a circuit breaker of the welding power source to disallow current through the welding power source when the sensed primary supply voltage exceeds the predefined voltage threshold. | 08-18-2011 |
20110226749 | ARC WELDING CONTROL METHOD AND ARC WELDING CONTROL SYSTEM - A welding control method alternately repeats a short circuit period, during which a welding wire and an object to be welded short-circuit, and an arc period, during which an arc is generated and discharged, to weld the object to be welded. The method compares average output voltage, which is an average of welding voltage calculated during welding, to set voltage preliminarily set, and controls a welding output current produced when an arc is generated based on the comparison result therefrom, to regulate the meltage of the wire for adjusting the arc length, which brings the short circuit cycle closer to a constant one when a disturbance (e.g. extended or shortened arc length) occurs. | 09-22-2011 |
20120000895 | METHOD OF CONTROLLING WELDING - A welding control method for a welding device having an output characteristic with a predetermined gradient showing a relation between a welding output voltage and a welding output current. By setting a set target welding voltage that is higher than the set initial welding voltage according to a difference between the set initial welding voltage and the welding output voltage, the welding output voltage is controlled to be the set target welding voltage. Thus, a proper arc length can be achieved early by correcting the change of the arc length due to, for example, motion of the hands of a welding operator. | 01-05-2012 |
20120006801 | ARC ENERGY REGULATION IN DRAWN ARC FASTENER WELDING PROCESS - A drawn arc welding process that includes the steps of providing a work piece, providing a welding tool holding a metal object onto the work piece, providing a power supply outputting a preset current, providing an arc voltage sensing device, lifting the metal object and drawing a pilot arc current, energizing a welding current locally melting the metal object and forming a weld pool in the work piece, measuring an arc voltage, predicting the arc voltage for a remaining time of the welding process, regulating the time of the welding process wherein the measured arc voltage and predicted arc voltage are utilized to control a desired energy input set point, and plunging the fastener into the locally melted work piece forming a weld between the metal object and the work piece. | 01-12-2012 |
20120031885 | POWER BOOSTER FOR METAL DISINTEGRATOR - A high power disintegrator system comprising a master disintegrator unit and a power booster disintegrator unit, the units being connectable in parallel to a common electrode, each unit including a cutting transformer and an adjustable auto transformer arranged to supply an adjustable voltage to its cutting transformer, an electrical control circuit responsive to voltage detected in the power booster unit that prevents operation of the booster unit when the auto transformers are set to produce different voltages at their respective cutting transformer. | 02-09-2012 |
20120061362 | Method and Apparatus For Welding With Short Clearing Prediction - A method and apparatus for providing welding-type power is disclosed and includes a short clearing prediction module that uses the second derivative with respect to time of the output voltage, or an error between a measured output voltage and an output voltage predicted using the first derivative with respect to time of the output voltage. | 03-15-2012 |
20120118865 | DEVICE AND METHOD TO CONTROL A POWER SOURCE - Apparatus, devices, and methods for providing a voltage reduction capability in a welding power source for safety purposes. The resistive load and the output voltage of the welding power source output are monitored and compared to predefined or preselected threshold values to generate a load condition signal and an output voltage condition signal (e.g., logic signals). The load condition signal and the output voltage condition signal serve as inputs to a voltage reduction device control logic which generates control signals to enable and disable the input and output of the welding power source according to the defined control logic. As a result, an extra measure of safety in preventing electrical shock is provided to users of the welding power source during hazardous operating conditions. | 05-17-2012 |
20120145691 | ARC WELDING METHOD AND ARC WELDING APPARATUS - An arc welding method of the present invention controls a short-circuit current increasing gradient (di/dt), an inflection point at which the short-circuit current increasing gradient (di/dt) changes, the current in a peak period and in a base period, and the time of the peak period in accordance with a difference between a set voltage and an output voltage. This allows the output voltage to be matched with the set voltage, and stabilizes the arc. Thereby, a stable arc welding method can be implemented, even as a method for outputting a welding current based on a welding voltage. | 06-14-2012 |
20120273473 | SYSTEMS AND METHODS TO CONTROL GAS TUNGSTEN ARC WELDING AND PLASMA ARC WELDING - A control system for a welding process controls the current applied to the welding torch in either a manual or automatic welding system. The arc voltage is monitored to determine when full penetration of the weld pool has occurred so that the current to the welding torch can be stopped. The arc voltage or the slope of the increase of the arc voltage can be used to operate the control algorithm. Additional variables such as torch speed, torch angle, and weld position can be used to influence the control algorithm. The contemplated systems include both GTAW and PAW welding process as well as others. | 11-01-2012 |
20120298644 | ENERGY CONSERVATION AND IMPROVED COOLING IN WELDING MACHINES - A system and method for generating a weld are provided. A power circuit in communication with a control circuit generates welding output voltage. A voltage reducing circuit in communication with the power circuit generates a reduced output voltage relative to the welding output voltage if the system determines that the welding process is idle for the predefined period of time. The welding output voltage is restored from the reduced voltage if the welding process is restarted. | 11-29-2012 |
20130056453 | ARC WELDING METHOD AND ARC WELDING APPARATUS - A consumable electrode arc welding method includes: setting an optimal voltage and an increasing slope of a short circuit current to correspond to a setting current; feeding a consumable electrode wire; and alternately generating a short circuit condition and an arc condition, thereby carrying out welding, wherein the short circuit current is controlled by changing the increasing slope of the short circuit current according to a difference between the setting voltage and the optimal voltage when the setting voltage is different from the optimal voltage. With this, the increasing slope of the short circuit current and the current value corresponding to the inflection point of the short circuit current are automatically changed. | 03-07-2013 |
20130119038 | SHORT ARC WELDING SYSTEM - A system for controlling a weld-current in an arc welding apparatus for short arc welding comprising a current regulator included in a voltage feedback loop from a power supply to a welding electrode and a ramp generator arranged to provide current ramps during a short circuit phase at said welding electrode. | 05-16-2013 |
20130161302 | METHOD OF AUTOMATICALLY SETTING A WELDING PARAMETER FOR MIG/MAG WELDING AND A CONTROLLER FOR PERFORMING THE METHOD - A method of automatically setting a welding parameter for MIG/MAG welding including the following steps:—initiating (S | 06-27-2013 |
20140131333 | Method to monitor and control weld penetration in gas tungsten welding and full-position pipe welding - The invention discloses a method to determine the weld joint penetration from arc voltage measurements in gas tungsten arc welding (GTAW). It is based on an observation on the dynamic weld pool surface in GTAW—the surface tends to first expand toward the electrode and then be pushed away from the electrode after full penetration is established. For the pool surface in GTAW, localized partial keyholes around the arc axis as in plasma are welding are not significant. The pool surface is relatively smooth. The arc voltage that reflects changes in the arc length thus first tends to reduce and then increases after full penetration is established. This invention thus tracks the arc voltage until the decrease slope becomes insignificant. Once full penetration is established, the current is reduced to decrease the weld penetration or first decrease the penetration growth for a certain period and then decrease the weld penetration. | 05-15-2014 |
20140144897 | DEVICE AND METHOD TO CONTROL A POWER SOURCE - Apparatus, devices, and methods for providing a voltage reduction capability in a welding power source for safety purposes. The resistive load and the output voltage of the welding power source output are monitored and compared to predefined or preselected threshold values to generate a load condition signal and an output voltage condition signal (e.g., logic signals). The load condition signal and the output voltage condition signal serve as inputs to a voltage reduction device control logic which generates control signals to enable and disable the input and output of the welding power source according to the defined control logic. As a result, an extra measure of safety in preventing electrical shock is provided to users of the welding power source during hazardous operating conditions. | 05-29-2014 |
20140263241 | VARIABLE POLARITY PULSE WITH CONSTANT DROPLET SIZE - An electric arc welder including a high speed switching power supply with a controller for creating high frequency current pulses with negative polarity components through the gap between a workpiece and a welding wire advancing toward the workpiece. Molten metal droplets are quickly created during negative polarity portions of the weld cycle. Welding controls include integrating a parameter during the negative polarity portions to determine when a desired amount of energy has been generated at the welding wire. This energy is associated with a desired droplet size for consistent droplet transfers to the workpiece. | 09-18-2014 |
20150034619 | Remote Sense Lead Magnitude and Polarity Controller - In a welding power supply, a feedback circuit senses electrical signals from the power output studs and from remote welding sense leads. The feedback control circuit scales the electrical signals and converts the signals to binary numbers having magnitude bits and a polarity bit respectively. The binary numbers, representing the signals, are simultaneously shifted into a logic processor for calculation of a feedback signal based on the digitized input. The feedback signal is calculated based on the polarity of connectivity of the remote welding sense leads as represented by the binary numbers. The feedback signal is then fed into the power supply output controller for automatically adjusting the power output of the arc welder. | 02-05-2015 |
20150053661 | WELDING POWER SUPPLY WITH DIGITAL CONTROLLER - A welding power supply including power conversion circuitry adapted to receive a primary source of power, to utilize one or more power semiconductor switches to chop the primary source of power, and to convert the chopped power to a welding output is provided. The provided welding power supply includes a pulse width modulated (PWM) digital controller including gate drive circuitry that generates a PWM output signal that controls the switching of the one or more power semiconductor switches. The PWM output signal includes a duty cycle term corrected for one or more sources of error in the welding system. | 02-26-2015 |
20150108103 | 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 the at least one segment in response to the sampling. The parameter is output power, a resistance of the load, an output current, an output voltage, or functions thereof in various embodiments. The control loop is preferably a PI or PID loop. The loop may be applied only within a window. The set point may be taught or fixed. The system can be used to weld with a controlled arc length. | 04-23-2015 |
20160144442 | WELDING DEVICE - The welding device of the present disclosure has a switching section, a setting section, an output detector, a controller, a frequency controller, and a driver. The switching section is formed of a switching element. The setting section determines setting output. The output detector detects welding output. The controller calculates an output-on period of the switching section according to the setting output and the welding output. The frequency controller determines an inverter frequency based on the output-on period. The driver controls on/off operation of a switching element of the switching section based on the inverter frequency and the output-on period. When the output-on period is calculated using a first ratio, the inverter frequency is determined to a first frequency, and when the output-on period is calculated using a second ratio smaller than the first ratio, the inverter frequency is determined to a second frequency higher than the first frequency. | 05-26-2016 |