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

Apparatus for determining a quality of a weld produced by a welding device according to the present invention includes a sensor operatively associated with the welding device. The sensor is responsive to at least one welding process parameter during a welding process and produces a welding process parameter signal that relates to the at least one welding process parameter. A computer connected to the sensor is responsive to the welding process parameter signal produced by the sensor. A user interface operatively associated with the computer allows a user to select a desired welding process. The computer processes the welding process parameter signal produced by the sensor in accordance with one of a constant voltage algorithm, a short duration weld algorithm or a pulsed current analysis module depending on the desired welding process selected by the user. The computer produces output data indicative of the quality of the weld.

Method and apparatus for assessing weld quality

A method and apparatus for providing a welding current is disclosed. The power source is capable of receiving any input voltage over a wide range of input voltages and includes an input rectifier that rectifies the ac input into a dc signal. A dc voltage stage converts the dc signal to a desired dc voltage and an inverter inverts the dc signal into a second ac signal. An output transformer receives the second ac signal and provides a third ac signal that has a current magnitude suitable for welding. The welding current may be rectified and smoothed by an output inductor and an output rectifier. A controller provides control signals to the inverter and an auxiliary power controller that can receive a range of input voltages and provide a control power signal to the controller.

Method And Apparatus For Receiving A Universal Input Voltage In A Welding Power Source

An electric arc welding apparatus for depositing molten metal from an advancing welding wire into a weld puddle in an open root between two juxtapositioned plates where the root extends in a welding path and is formed by converging walls terminating in generally parallel walls spaced to define a gap, which apparatus comprises a contact holder with a wire outlet, a switching power supply directing welding current to the wire as the wire passes from the outlet toward the open root, with the advancing wire defining an electrode stick out between the contact holder and the weld puddle, a circuit for sensing the length of the stick out, and control means for adjusting the welding current as a function of the sensed stick out length.

Method and apparatus for electric arc welding

A method and system to manufacture workpieces employing a high intensity energy source to create a puddle and at least one resistively heated wire which is heated to at or near its melting temperature and deposited into the puddle as droplets.

Method and system for additive manufacturing using high energy source and hot-wire

An arc welding machine comprises an output control circuit (2) which produces an arc output in accordance with output control signal, an output detection circuit (3) which measures the state of arc output and produces a feedback signal indicative of the output arc state, and a fuzzy inference control circuit (1) which introduces the feedback signal, produces a welding current waveform and welding voltage waveform required to produce the optimal arc state based on the fuzzy inference, and delivers the resulting waveforms to the output control circuit as the output control signal.

ARC welding machine

In a consumable electrode type pulsed arc welder using a CO 2 shielding gas a voltage detected by a detector (13) is given to a comparator (14) to which a reference voltage of a voltage setting circuit (15) is also inputted. When the detected voltage exceeds the reference voltage, a droplet detachment detection signal is issued. Then, an output adjusting circuit (16) lowers the welder output to a level I r lower than the ordinary current I p .

Apparatus for controlling a consumable electrode pulsed-arc welding power source

A consumable electrode type pulsed arc welder and a controlling method for the same, wherein at least one of a welding current and a welding voltage is output to a wire in accordance with a duty time of a pulse waveform group comprising a first pulse period to form a droplet having a predetermined amount at an end of the wire, a base period to shorten an arc length between the droplet and a base metal, and a second pulse period to detach the droplet.

Consumable electrode type pulsed arc welder and controlling method for the same

In an arc start ancillary apparatus, which is connected in parallel to a welding power source for supplying electric power necessary for arc discharge between an electrode and a base metal, for supplying a pulsed electric current in transferring from spark discharge to arc discharge, an object of the present invention is to solve a problem in that arc is not started, and to keep the effective value of current low. A capacitor with a relatively high capacitance is connected to secure a current for transferring from spark discharge to arc discharge, and a D.C. high voltage of a high voltage generator is applied according to a pulse in a period to which the period of pulse signals of a fixed period type high voltage controller is set so that the effective value of the current between an electrode and a base metal is kept low.

Tetsu Innami

Papers

ARC welding machine

Apparatus for controlling a consumable electrode pulsed-arc welding power source

Consumable electrode type pulsed arc welder and controlling method for the same

Arc start ancillary apparatus

Arc welding device