A method and apparatus for welding include initiating a pulse welding process includes initiating a welding arc by providing CC type welding power, maintaining the arc by providing CV type power. Then, pulse type welding power is provided. The method and system can be used to start short circuit, or other welding processes by providing short circuit power, or welding power of a given mode, instead of providing pulse power. Also, in one alternative, a method and system of initiating a pulse, short circuit, or given welding process includes initiating a welding arc by providing CC type welding power at least until a pseudo-equilibrium for the arc is established. Then, providing welding power in a pulse, short circuit, or the given mode.

Method and apparatus for welding

The present invention is directed to a system and method of remotely controlling a welding machine with command signals transmitted to the welding power source across a weld cable connecting the power source to a remote device, such a wire feeder. A transmitter transmits the control commands containing desired welding operational parameters to a receiver disposed in the power source across a weld cable also designed to carry welding power from the power source to the wire feeder.

Remote wire feeder using binary phase shift keying to modulate communications of command/control signals to be transmitted over a weld cable

A method and apparatus for feeding wire in a welding system include one or more motors disposed adjacent the wire to drive it. A wire feed motor is also disposed along the wire path, and is closer to the source of wire than the torch, and closer to the source than the one or more motors. The motors may be a pair motors disposed on opposite sides of the wire and move the wire to and away from an arc end of a torch. They preferably reversing the direction of the wire within one process cycle. The or more motors may be a stepper motor, a servo motor, a zero backlash motor, a gearless motor, a planetary drive motor, or a linear actuator (such as a piston), in various embodiments.

Method and apparatus for feeding wire to a welding arc

A method and apparatus of communicating control signals to a welding power source from a remote location includes a welding system operated by control signals transmitted by a wireless remote control that can be remotely located from the welding power source. A plurality of welding parameters in the welding system are set and adjusted in response to wireless command signals transmitted to a controller including a control transceiver located on the welding power source. In this regard, an operator is able to quickly and efficiently control a welding system from a remote location, with no more cables than are necessary to perform the intended task.

Method and apparatus for wireless remote control communication of a welder

A monitor designed to aid in the instruction of electric arc welding. The device is electrically isolated from the welder arc voltage by an optical coupling device which provides an isolated output signal linearly proportional to either arc voltage or arc current. Audio alarms are triggered when the arc voltage is either too high or too low indicating arc lengths that are too low indicating arc lengths that are too long or too short to provide acceptable weld quality. A self test switch is included to demonstrate the upper and lower voltage alarm operation.

Arc welding instruction monitor

A touchwork system for use in conjunction with a MIG arc welding apparatus comprising a sensing circuit operating at very low output voltages, e.g. 6-8 volts, which senses the touch of the consumable wire electrode to the workpiece when the welding process is started. A control circuit energizes the welding contactor in response to a signal from the sensing circuit and turns on the power supply. At the same time, the control circuit starts the wire feeder motor and also the flow of shielding gas to the torch. A detector circuit detects the flow of welding current and feeds a signal to the control circuit to keep the welding contactor energized and the power supply in circuit and also to maintain operation of the wire feeder motor and the flow of shielding gas to the torch.

Touchwork system for a MIG arc welding apparatus

A sensor circuit coupled to an arc welding system and responsive to the arc welding voltage including an oscillator and means for varying the frequency thereof in response to the arc voltage, light emitting means responsive to the oscillator frequency, and detecting circuit means responsive to the light emitting means for providing a DC voltage proportional to the arc voltage.

Voltage sensor circuit for an arc welding wire feed control

Electric welding system having a governor control for regulating the speed of the electrode drive motor and for controlling the direction of motor rotation in response to voltage and current welding parameters such that during welding the motor is driven in a forward direction toward the workpiece and under the control of a weld speed potentiometer whereas during a short circuit condition and at termination of the welding operation the motor direction is reversed.

Welding system with reversible drive motor control

A solid-state current-detector circuit capable of detecting the presence of a predetermined magnitude of AC or DC current in a power cable wherein the current may vary over an extended range which includes means for sensing the voltage drop in a relatively short length of cable which means changes its electrical state when said voltage drop exceeds a predetermined level.

Current detector circuit

A method for controlling selected switching between preset welding schedules in a MIG welding operation, in response to operation from a single control switch having only on and off signal selections.

Tibor E. Toth

Papers

Touchwork system for a MIG arc welding apparatus

Voltage sensor circuit for an arc welding wire feed control

Welding system with reversible drive motor control

Current detector circuit

Semi-automatic control and method for MIG welding