Luminescence sensing system for welding
AssigneePraxair Technology, Inc.
InventorsHelio Cordeiro De Miranda, Valtair Antonio Ferraresi, Americo Scotti
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Abstract
A method and apparatus can adaptively control a pulsed power arc welding process. A trainable system can recognize an empirical transfer mode from a signal emitted during an arc welding pulse and determine a pulsed power parameter set to produce a modified transfer mode in a subsequent pulse, by controlling a power source using the parameter set.
Claims22
A method of adaptively controlling a pulsed power arc welding process, comprising:
- sensing a signal emitted during an arc welding pulse;
- employing a trainable system to:
- recognize an empirical transfer mode from the signal;
- determine a pulsed power parameter set to produce a modified transfer mode in a subsequent pulse;
- and
- controlling a power source using the parameter set.
A method of controlling a pulsed power arc-welding process, comprising:
- sensing a radiant flux signal emitted during an arc welding pulse;
- employing a neural network to:
- recognize an empirical transfer mode from the signal;
- determine a pulse period increment to produce a modified transfer mode in a subsequent pulse;
- and
- controlling a power source using pulse period increment, whereby only a single metal droplet is transferred during each pulse for at least about 90% of the pulses.
A method of training a neural network for controlling a pulsed power arc welding process, comprising:
- producing training data and validation data for a plurality of pulse examples, wherein each example includes:
- a representation of a signal emitted during at least one arc welding pulse;
- an empirical transfer mode for the pulse;
- producing a set of control flags, wherein each flag includes:
- a classification of an empirical transfer mode relative to a target transfer mode;
- a control action for at least one value in a pulsed power parameter set;
- and
- training a neural network using the training data, the validation data and the flags, whereby the network:
- recognizes the empirical transfer mode 01 one or more arc welding pulses;
- and
- applies the control action, thereby producing a modified transfer mode in a subsequent pulse.
The method of claim l0, wherein the target transfer mode consists essentially of a single metal droplet transferred during each pulse for about 90% of the pulses.
An apparatus for controlling a pulsed power source for arc welding, comprising:
- a sensor;
- a controller, comprising:
- a signal acquisition module, whereby a signal from the sensor is acquired;
- a trainable system, wherein the system is trained to:
- recognize an empirical transfer mode from the signal;
- control a parameter set for a pulsed power source, whereby a modified transfer mode is produced in a subsequent pulse;
- and
- a control interface to control the power source using the parameter set.
An apparatus for controlling a pulsed power source for arc welding, comprising a neural network trained to:
- recognize an empirical transfer mode from a signal emitted during an arc welding process;
- and
- determine a parameter set for an arc welding pulsed power source to produce a modified transfer mode.
A system for adaptively controlling a pulsed power arc welding process, comprising:
- means to sense a signal emitted during an arc welding pulse;
- a trainable system comprising:
- means to recognize an empirical transfer mode from the signal;
- means to determine a pulsed power parameter set to produce a modified transfer mode in a subsequent pulse;
- and
- means to control a power source using the parameter set.
A system to control a pulsed power arc-welding process, comprising
- means to sense a radiant flux signal emitted during an arc welding pulse;
- a neural network comprising:
- means to recognize an empirical transfer mode from the signal;
- means to determine a pulsed power parameter set to produce a modified transfer mode in a subsequent pulse;
- and
- means to control a power source using pulse period increment, whereby only a single metal droplet is transferred during each pulse for at least about 90% of the pulses.
Dependencies are inferred from the claim text.