Abstract: A different material welded joint in which a first member made of a first material and a second member made of a second material having a melting point lower than that of the first material are joined to each other by welded parts, wherein the first member has a plurality of through-holes and a filler material made of the second material is filled in the plurality of through-holes, and wherein an interval between the through-holes is made wider and/or an area of the through-hole is made smaller at a welding end-side than at a welding start-side with respect to progress of welding.

Abstract: An automated welding system includes a welding robot and control circuitry. The welding bug robot includes a welding torch. The welding bug robot is configured to move on a track disposed around a circumference of a first pipe and perform a root pass welding operation at a joint between the first pipe and a second pipe. The control circuitry is configured to control movement of the welding bug robot around the circumference of the first pipe, apply a high energy welding phase via the welding torch to establish a first root condition, and apply a low energy welding phase via the welding torch to establish a second root condition.

Abstract: A different material welded joint in which a first member made of a first material and a second member made of a second material having a melting point lower than that of the first material are joined to each other by welded parts at a plurality of welding sections, wherein the first member has a plurality of through-holes respectively corresponding to the plurality of welding sections and a filler material made of the second material is filled in the plurality of through-holes, and wherein apexes of welding beads of the welded parts, which are deposited and formed on a surface of the second member facing the through-holes, are formed independently of each other at each of the welding sections.

Abstract: Apparatuses, components, methods, and techniques for altering equipment operation are provided. An example tool control and breathable air delivery system includes equipment including a tool and a controller configured to control the tool. The example system also includes a wearable respirator and an air delivery device connected to the wearable respirator. The example system further includes an air evaluation monitor configured to generate a signal based upon a condition of air being delivered to the wearable respirator. An example electronic circuit is configured to adjust the tool based at least in part on the signal generated by the air evaluation monitor. An example method includes enabling the tool, providing air to a respirator, determining a condition of the air, and adjusting the tool based on the condition of the air.

Abstract: In arc welding, determining a current value to be high in an early stage of the arc period is effective in reducing spatters caused by feeble short circuit in the arc period. In that case, to sharply decrease the voltage that has increased with increase in current, an inductance value of a reactor has to be kept small. However, a small inductance value causes a problem—weakness against disturbance. The present invention provides an arc welding control method that performs arc welding while repeating the short-circuit period and the arc period. According to the method, changing an inductance value relating to welding output in the arc period offers stable arc welding with fewer spatters and insusceptibility to disturbance.

Abstract: An arc spot welding method able to give a predetermined weld bead diameter or excess metal height in a back surface weld bead of arc spot welding and able to give a welded joint excellent in both strengths of TSS and CTS and a welding apparatus for working the same are provided. Steel sheets containing carbon in 0.2 mass % or more and having sheet thicknesses “t” or more are arranged overlaid. A backing plate including a non-contact part and a contact part maintaining the back surface of the lower side steel sheet is provided. An arc generation and short-circuit conduction where the welding voltage between the welding wire and upper side steel sheet becomes 10V or less are alternately repeated so that the time period of the short-circuit conduction becomes over 30% to less than 60% per cycle to thereby weld the steel sheets.

Abstract: An arc welding apparatus includes: a driver for advancing and retreating a welding consumable with respect to a workpiece to generate a short circuit condition and an arc condition; a state detector for detecting respective starts of the short circuit condition and the arc condition based on a voltage between the workpiece and the welding consumable; a time detector for detecting that an elapsed time from the start of the short circuit condition reaches a reference time using a time shorter than an estimated continuation time of the short circuit condition as the reference time; and a power controller for reducing an electric current between the workpiece and the welding consumable corresponding to a state where the elapsed time reaches the reference time and raising the electric current after the start of the arc condition.

Abstract: A method includes receiving data corresponding to a voltage level over time and a current level over time. The method also includes determining a first ratio corresponding to a voltage ramp percent or a voltage falling edge percent with respect to a peak in the voltage level and determining a second ratio corresponding to a current ramp ratio or a current falling edge ratio with respect to a peak in the current level. The method further includes determining, based on a comparison between the first ratio and the second ratio, whether to increment, decrement, or maintain an inductance compensation estimation value corresponding to an estimated inductance present in one or more secondary components associated with the welding operation.

Abstract: The present invention improves the stability of welding conditions in a welding method that involves cyclically repeating forward feed and reverse feed of a welding wire. Provided is an arc welding control method involving cyclic repetition of forward feed and reverse feed of a welding wire at feed speed, generating short-circuit intervals and arc intervals, during which arc intervals, application of a first welding current is followed by application of a second welding current smaller than the first welding current, wherein the phase of the feed speed at the point in time of transition from an arc interval to a short-circuit interval is detected, and the value and/or the application duration of the first welding current is varied in accordance with the detected phase. In so doing, fluctuation of the phase of the feed speed due to outside disturbances during generation of short-circuiting can be minimized.

Abstract: Disclosed herein is a technique for reducing harmonics resulting from the rotation of a motor and generated in a power supply current. This power converter device includes a compensation current generator (52) configured to control compensation currents (Icr, Ics, Ict) flowing between itself (52) and an AC power supply (12), and a compensation controller (60; 260) configured to obtain output voltage instruction values (Vid, Viq) such that the compensation currents (Icr, Ics, Ict) cancel a harmonic component in load currents (Ir, Is, It) flowing from the AC power supply (12) into a rectifier (22) and resulting from the rotation of the motor (16) and a harmonic component in the load currents (Ir, Is, It) and dependent on a period (Ts) of a voltage of the AC power supply (12).

Abstract: In controlling an arc welding of consumable electrode type in which pulse welding and short-circuit welding alternately repeat, forward feeding and backward feeding of a welding electrode periodically repeat in a short-circuit welding period. The forward feeding of the welding electrode starts when a welding current is smaller than a base current immediately before a pulse period ends.

Abstract: There is provided an arc welding power supply. An output control unit outputs welding voltage and current in correspondence to each of a short-circuiting period and an arc period. A feeding control unit controls a feeding rate of a welding wire. A short-circuit forcibly generating period is provided between forward feeding acceleration and deceleration periods. In the short-circuit forcibly generating period, the feeding control unit increases the feeding rate with a change rate larger than a change rate during the forward feeding acceleration period and maintains a predetermined forward feeding peak value when the feeding rate reaches the peak value.

Abstract: A welding or cutting system having a power supply with no user interface hardware or software for controlling the operation of the power supply, and a mobile communication device which contains an application allowing for control of the power supply. The mobile device is coupled to the power supply through either a wired or wireless connection.

Abstract: A method of automatically setting a welding parameter for MIG/MAG welding is disclosed. The method includes initiating a parameter setting welding operation; measuring a welding voltage and retrieving a parameter representing a wire feed speed during the parameter setting welding operation; and identifying a second function mapping the welding current to the welding voltage from the measured welding voltage and the retrieved parameter.

Abstract: 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.

Abstract: A welding system includes a torch motion sensing system associated with a welding torch and is configured to sense welding torch orientations or movements. The welding system also includes a processing system that is configured to vary operation of a power source based on the sensed orientations or movements.

Abstract: 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.

Abstract: A welding regime may implements cyclic short circuits under a closed loop voltage control approach. Upon clearing or imminent clearing of the short circuit, a current recess is implemented. The current recess reduces the current that would otherwise be applied to the weld, resulting in multiple benefits. The recess may be implemented by suspending voltage command signals. Following the current recess, normal control is resumed with the then-current voltage command.

Abstract: A welding system comprises a welding power source that provides an alternating current in a selected wave form having a set of positive and negative portions, the negative portion consisting of a peak, tailout, and background phase, and the positive portion consisting of a peak, tailout, and background; wherein the power source provides an upward ramping current during the pinch and detachment phase, switches to an electrode negative current during the negative peak, tailout, and background phases, and switches to a subsequent electrode positive portion; wherein, the positive portion may repeat prior to the next shorting event.

Abstract: A method for repairing an air cycle machine compressor housing includes removing a journal bearing support sleeve in an air cycle machine compressor housing, positioning a cylindrical insert within the air cycle machine compressor housing, wherein the cylindrical insert has an outer diameter greater than an outer diameter of at least one portion of the removed journal bearing support sleeve, an inner diameter less than an inner diameter of at least one portion of the removed journal bearing support sleeve, and a length greater than a length of the removed journal bearing support sleeve, welding the cylindrical insert to the air cycle machine compressor housing, and machining the welded cylindrical insert to form a replacement journal bearing support sleeve.

Abstract: The present invention is directed to a remotely controlled welding machine. A remote control uses the welding circuit to transfer information to a welding power source. The information to be communicated to the power source includes welding power source output command information (amperage/voltage control), welding circuit on/off information (power source output contactor control), and power source mode control (constant voltage/constant current). A transmitter transmits the desired welding operational parameters to a receiver disposed in the power source. The transmitter is constructed to use only a small amount of power which, preferably, is supplied by one or two low voltage replaceable and/or rechargeable batteries. Additionally, an open circuit voltage is not created between the power source and an electrode holder when an arc is not present.

Abstract: Systems and methods for providing an improved start in a welding process are provided. The system may include a power circuit and a control circuit. The power circuit can generate a welding output power. The control circuit may be in communication with the power circuit to control, during the start of the welding process, at least one welding parameter until the control circuit determines that welding energy output exceeds an energy output threshold.

Abstract: A method for repairing a cabin air compressor outlet housing includes removing a journal bearing support sleeve in a cabin air compressor outlet housing, positioning a cylindrical insert within the cabin air compressor outlet housing, wherein the cylindrical insert has an outer diameter greater than an outer diameter of at least one portion of the removed journal bearing support sleeve, an inner diameter less than an inner diameter of at least one portion of the removed journal bearing support sleeve, and a length greater than a length of the removed journal bearing support sleeve, welding the cylindrical insert to the cabin air compressor outlet housing, and machining the welded cylindrical insert to form a replacement journal bearing support sleeve.

Abstract: A welding machine power supply apparatus outputs welding current in accordance with welding conditions set through operation of a display and setting unit (20). When a welding operation is ended while the welding machine power supply apparatus is operating, the welding conditions effective at the time the welding operation is ended are automatically stored in a memory (16). When any ones or more of the welding conditions at the time when the welding operation is resumed by the use of the welding machine power supply apparatus are different from the one or ones which were effective when the welding operation was ended, a load button (70), a rotary encoder (64) and a set button (72) are operated to cause a control unit (14) to read out the welding conditions stored in the memory (16) which were effective when the welding operation was ended, and to set the read-out welding conditions in the welding machine power supply apparatus.

Abstract: A real-time virtual reality welding system including a programmable processor-based subsystem, a spatial tracker operatively connected to the programmable processor-based subsystem, at least one mock welding tool capable of being spatially tracked by the spatial tracker, and at least one display device operatively connected to the programmable processor-based subsystem. The system is capable of simulating, in virtual reality space, a weld puddle having real-time molten metal fluidity and heat dissipation characteristics. The system is further capable of importing data into the virtual reality welding system and analyzing the data to characterize a student welder's progress and to provide training.

Abstract: A pulsed welding regime includes a peak phase in which energy is added to an electrode and a weld puddle, and a molten ball begins to detach from the electrode, followed by a dabbing phase in which current is significantly reduced to place the ball in the weld puddle with addition of little or no energy. The resulting short circuit clears and the system proceeds to a background phase. The current in the dabbing phase is lower than the current during the background phase. The process may be specifically adapted for particular welding wires, and may be particularly well suited for use with cored wires. The dabbing phase allows for lower energy to be transferred to the sheath of such wires, and resets the arc length after each pulse cycle.

Abstract: A method and apparatus for providing welding-type power and auxiliary power includes an input circuit, a welding-type output power circuit, an auxiliary power circuit, and a controller. The input circuit receives input power and provides power to a common bus. The welding-type output power circuit receives power from the common bus and provides welding-type output power. The auxiliary power circuit receives power from the common bus and provides non-isolated auxiliary output power. The controller controls the auxiliary power circuit and the welding-type output power circuit.

Abstract: Thruster grid clear circuits and methods to clear thruster grids are disclosed. An example apparatus includes a low voltage grid clear circuit to apply first energy to a grid at a first voltage, and a high voltage grid clear circuit to detect a failure of the applied energy to clear a short circuit condition of the grid and to apply second energy to the grid at a second voltage higher than the first voltage.

Abstract: Welding power is generated by first generating two different current waveforms, and comparing the waveform values for control intervals to select which waveform provides the greater current. The waveforms are for different transfer modes, such as one for a pulsed arc portion, and another for a short-circuit transfer mode or for short-circuit clearing. The waveforms may be programmed by settings in a state machine. A balance or relative prioritization in the comparison may be influenced by user inputs. The resulting hybrid process has aspects of both spray transfer and short-circuit transfer modes.

Abstract: Systems and methods for providing an improved start in a welding are provided. The system may include a power circuit and a control circuit: The power circuit may generate welding output power for a welding process. The control circuit may control the start of the welding process, for example, by generating a current pulse.

Abstract: A welding power source configured to receive an input power includes a plurality of components and supervising circuitry configurable in a plurality of modes. The plurality of components include power conversion circuitry and background power supply. The supervising circuitry is configured to distribute the input power to the plurality of components based at least in part on a mode of the plurality of modes. The plurality of modes include a welding mode configured to distribute the input power to the power conversion circuitry and to the background power supply. The plurality of modes also include a monitoring mode configured to distribute the input power to the background power supply, and to not distribute the input power to the power conversion circuitry.

Abstract: A system and method for generating a weld are provided. The system receives a selection of a magnitude of a voltage. The system selects a first weld control algorithm when the magnitude of the voltage is in a first range of values. The system may also select a second weld control algorithm when the magnitude of the voltage is in a second range of values. The system may generate welding output power based on the first and second weld control algorithms.

Abstract: Systems and methods for providing an improved start in a welding process are provided. The system may include a power circuit and a control circuit. The power circuit can generate a welding output power. The control circuit may be in communication with the power circuit to control, during the start of the welding process, at least one welding parameter until the control circuit determines that welding energy output exceeds an energy output threshold.

Abstract: A method and apparatus for providing welding-type power and auxiliary power includes an input circuit, a welding-type output power circuit, an auxiliary power circuit, and a controller. The input circuit receives input power and provides power to a common bus. The welding-type output power circuit receives power from the common bus and provides welding-type output power. The auxiliary power circuit receives power from the common bus and provides non-isolated auxiliary output power. The controller controls the auxiliary power circuit and the welding-type output power circuit.

Abstract: A method of controlling a welding system includes providing a welding wire to a welding torch at a first wire feed speed, providing a pulsed power output to the welding wire via a contact point of the welding torch, determining, utilizing a sensing system, a contact-point-to-work-distance (CPWD) between the contact point and a workpiece, and changing, utilizing a controller, the wire feed speed of the welding wire to a second wire feed speed based at least in part on the determined CPWD.

Abstract: The present invention provides a synchronous rectification converter circuit, including three transformer secondary-windings, three current transformer, a synchronous rectification switching unit, a diode rectification unit, and a control unit. Each of three current transformers includes a primary-winding and secondary-winding. The three transformer secondary-windings and the three current transformer primary-windings are alternately connected in series to form a first triangular structure. Three vertices of the first triangular structure are connected to the synchronous rectification switching unit. The three current transformer secondary-windings are connected in series to form a second triangular structure. Three vertices of the second triangular structure are connected to the diode rectification unit. The diode rectification unit is connected to the control unit and the synchronous rectification switching unit is connected to the control unit.

Abstract: An arc-welding method in welding by repeating a short circuit and an arc. When the sign of opening of the short circuit is detected, the welding current is reduced from a first current value at the detection of the sign to a second current value, which is lower than the first current value. When the opening of the short circuit is detected, a pulse current having a peak value higher than the first current value is supplied at a plurality of times in the arc period. This suppresses porosities and spatters when galvanized steel sheets are welded.

Abstract: A method and circuit for starting a three-phase motor in a manner that reduces inrush current normally associated with starting an AC motor. The method uses the circuit to start the three phase motor gradually with three phase alternating current having relatively low frequency and gradually increasing the frequency up to or above the motor operating frequency over a period of time and then switching in a steady state or static three phase alternating power supply to power the three phase motor.

Abstract: An air conditioner having an indoor unit and an outdoor unit, at least one of which includes a communication unit, a switching unit turned on when communication lines are connected to the communication unit, turned off in a standby mode, and turned on when the standby mode is released, a voltage distribution unit distributing voltage applied to the communication unit when the switching unit is turned off, a voltage adjustment unit adjusting the voltage applied to the communication unit and transmitting the adjusted voltage to the communication unit, and a control unit turning the switching unit on when driving voltage is input to the control unit, turning the switching unit off when the at least one of the indoor unit and the outdoor unit enters the standby mode, and turning the switching unit on based on the voltage distributed by the voltage distribution unit in the standby mode.

Abstract: A method of operating a welding wire feeder includes receiving an input power from a welding power source, actuating a power relay to close and open a first current carrying path for application of the input power, and actuating bypass circuitry coupled in parallel to the power relay to close and open a second current carrying path in coordination with actuating the power relay. The method of operating the welding wire feeder also includes providing a welding wire to a welding torch.

Abstract: A system is provided for configuring a delivery device of a cutting or welding apparatus. The system includes a determination module and a mobile computing device. The determination module is configured to determine at least one desired component of the delivery device or a value for at least one operating parameter of the cutting or welding apparatus. The mobile computing device includes a receiver, a reader and a processor. The receiver is configured to receive information from the determination module including at least one of i) identification of the desired component or ii) the value of the operating parameter. The reader is configured to read an element associated with a selected component, where the element provides indicia of at least one characteristic of the selected component. The processor is configure to approve the selected component for assembly into the delivery device.

Abstract: The invention relates to a method for defining an interface (32, 42, 52, 62) of a welding power source (31, 41, 51, 61) for communication with an external machine (26) that is connected to the interface. A freely configurable interface is used in the welding device, said interface being configured and activated via software directly via the operating panel of the welding power source or an external device that can be connected to the welding power source. A parameter of the welding device is allocated to an internal and/or external connection (101 . . . 105). Optionally, a link is established by stringing together graphic symbols of the software. The invention further relates to a welding power source (31, 41, 51, 61) and to a computer program which are set up for performing or storing the process according to the invention.

Abstract: Welding systems are presented, in which a single power source provides a first DC output to a plurality of digital waveform controlled chopper modules. Welding modules are also disclosed for converting an input DC signal to a welding signal, which are comprised of a down-chopper for providing a welding signal waveform according to a pulse width modulated switching signal, along with a digital waveform controller providing the switching signal according to a desired waveform.

Abstract: A consumable electrode arc welding method includes the detecting of a constriction formed in a molten droplet of the welding wire so as to reduce the welding current, the detecting of a smoothed value of the welding current, and the feedback controlling of the feed rate of the welding wire so as to make the smoothed value of the welding current correspond to a predetermined current setting value. The constriction detection is performed repetitively in a predetermined cycle. In each time of the repetition, the length of a constriction time, from the constriction detection till the arc generation, is measured. The number of constriction time lengths falling outside a predetermined range is counted. When the counted number is not less than a reference number, the transient response time of the feedback control is made longer.

Abstract: Various technologies presented herein relate to driving a LED such that the LED emits short duration pulses of light. This is accomplished by driving the LED with short duration, high amplitude current pulses. When the LED is driven by short duration, high amplitude current pulses, the LED emits light at a greater amplitude compared to when the LED is driven by continuous wave current.

Abstract: The disclosure relates to a capacitor arrangement for an input circuit or intermediate circuit of a voltage transformer comprising at least two capacitors and two connection nodes. Switching elements are provided, by means of which the at least two capacitors are connected in parallel with each other in a first operating state and are connected in series with each other in a second operating state. The disclosure also relates to a voltage transformer arrangement comprising such a capacitor arrangement and an operating method for a capacitor arrangement.

Abstract: Methods and apparatuses for controlling synchronous start-up of power converters arranged in parallel in droop load share switched-mode power supplies are described. In one embodiment, a method may be performed by circuitry in a DC-DC power converter. The DC-DC power converter includes an inverting switch that converts input DC power to intermediate AC power, a transformer coupled to the inverting switch to receive the intermediate AC power and provide stepped-down AC power, and a synchronous rectifier coupled to the transformer to convert the stepped-down AC power to output DC power. The method comprises detecting that the inverting switch is not switching during start-up of the DC-DC power converter, and increasing a reference voltage set point of the DC-DC power converter in response to detecting that the inverting switch is not switching to force the inverting switch to start switching.

Abstract: A method of controlling a welding system includes controlling a weld current supplied to an electrode at a current ramp rate and determining an arc length based at least in part on the controlled weld current and a changing arc voltage. The arc length includes a distance between the electrode and a workpiece, and the arc voltage includes a voltage between the electrode and the workpiece.

Abstract: A method includes receiving data corresponding to a voltage level over time and a current level over time. The method also includes determining a first ratio corresponding to a voltage ramp percent or a voltage falling edge percent with respect to a peak in the voltage level and determining a second ratio corresponding to a current ramp ratio or a current falling edge ratio with respect to a peak in the current level. The method further includes determining, based on a comparison between the first ratio and the second ratio, whether to increment, decrement, or maintain an inductance compensation estimation value corresponding to an estimated inductance present in one or more secondary components associated with the welding operation.

Abstract: An arc welding system and method where burnback time (BBT) is correlated to wire feed speed (WFS). Means for feeding a wire electrode toward a workpiece and means for selecting a wire feed speed (WFS) are provided. Also, means for automatically adjusting a burnback time (BBT) of the wire electrode in response to the selected wire feed speed (WFS) is provided.