Nova Patents
CA2390870C

Method and apparatus for welding and control thereof

Abstract

A method and apparatus for welding includes one or more of a welding type power source, a feedback circuit, a wire feeder and a controller. The controller preferably has an eta control circuit responsive to the feedback. It also has a control loop having a response time responsive to the eta output. The controller detects whether or not the process is a fast-tack process, and controls the supply of, power according to a first control scheme is the process is a fast-tack process, and according to a second control scheme if the process is not a fast-tack process. The controller sets the run-in wire feed speed as a percentage of weld wire feed speed, preferably obtaining the percentage from the weld wire feed speed potentiometer at start up. The controller enters a calibration mode at start up if a calibration pendant is attached and on. In the calibration mode calibration receiving values from the front panel potentiometers.

CA2390870C, drawing sheet 1
Sheet 1 of 6

Term

Term ended

Expired 18 June 2022, 4.3 years ago.

  1. Priority
  2. Filed
  3. Granted
  4. Expired
  5. Today

19 claims: 7 independent, 12 dependent

  1. 1
    CA 02390870 2002-06-18 -27CLAIMS The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:1. A system for welding, comprising: a welding-type, power source, wherein the welding-type power source has at least one control input, and‘ a welding-type output;a feedback circuit, responsive to the welding-type output,. and having a.feedback output;and a controller having a feedback input connected to the feedback output, having an eta control circuit responsive to the feedback input, x an eta output, and at least one control loop having a selectable response time, a response time selector responsive to the eta output, and a control output connected to the control input. ;Τ'
  2. 12
    13. A system of providing welding power, comprising:means for providing a welding-type output;means for feeding back an output parameter, connected to the means for providing;means for determining an eta of the output, connected to the means for feeding back;means for controlling the welding-type output in response to the output parameter, connected to the means for providing and the means for feeding back;and means for setting a response time of the means for controlling in response to eta, connected to thé means for controlling and the means for determining.
  3. 15
    16. A system for welding, comprising:a welding-type power source, having at least one control input, and a welding-type output;· a feedback circuit, responsive to the welding-type output, and having a feedback output;a controller having a feedback input connected to the feedback output, CA 02390870 2002-06-18 -30a voltage control loop responsive to the feedback input, a temporal control loop responsive to thé feedback input, a control output, responsive to that voltage control loop and the temporal control loop, connected to the control input.
  4. 16
    17. A system for welding, comprising:power means for supplying welding-type power in response to at least one control input;feedback means·for feeding back at least ohe output parameter of the welding-type power, connected to the power means;control means for controlling the power means in response to the a feedback means, connected to the feedback means and the power méans, wherein the control means includes a voltage control loop and a temporal control loop. .
  5. 17
    18. A method of providing welding power, comprising:providing a welding-type power output;feeding back a parameter of the power output;controlling the welding-type power in response to the feeding back, using a voltage control loop and a temporal control loop.
  6. 18
    19. A welding-type power supply controller comprising:at least one feedback input;a voltage control loop, including a voltage feedback input connected to the feedback input, and CA 02390870 2007-03-22 -31an integrator having first and second feedback capacitors, wherein a switch, having a switch control input, is in series with the second capacitor;and an eta controller having an input connected to the feedback input, and an output connected to the switch control input.
  7. 19
    20. A method of controlling welding-type power comprising:providing voltage feedback;integrating the difference between a voltage feedback and a threshold using an integrator with first and second capacitors in a feedback path;comparing eta to a window;switching the second feedback capacitor in and out of the feedback path in response to comparing éta.
Independent claims7