US 2004/0069759 A1 · Method and apparatus for welding with CV control

Abstract

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.

Claims55

Dependent claims

A method of controlling a welding power supply, comprising:

providing a cyclical CV output having a voltage;
dividing each cycle into at least two segments;
sampling an output parameter a plurality of times within at least a one of the segments;
and
controlling the CV output within the at least one segment in response to the sampling performed within the at least one segment.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

10/268,514Filed 9 Oct 2002

Published

15 Apr 2004

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

B23K 9/092
Characterised by the circuits: characterised by the shape of the pulses produced
B23K 9/091
Arrangements or circuits for arc welding with pulsed current or voltage: characterised by the circuits
B23K 9/0953
Monitoring or automatic control of welding parameters: using computing means
B23K 9/0956
Monitoring or automatic control of welding parameters: using sensing means, e.g. optical

Method and apparatus for welding with CV control

Life of this patent

Method and apparatus for welding with CV control

Life of this patent

Abstract

Claims55