Initiation of welding arc by restricting output

• US 10,137,520 B2
• Filed: 12/13/2017
• Issued: 11/27/2018
• Est. Priority Date: 05/26/2011
• Status: Active Grant

• Current Assignee: Victor Equipment Co. (Enovis Corp.)
• Original Assignee: Thermal Dynamics Corporation (Enovis Corp.)
• Inventors: Lambert, Roger H., Putnam, Geoffrey H.
• Primary Examiner(s): Laflame, Jr., Michael
• Application Number:
  US15/840,368
• Publication Number:
  US 20180111215A1
• Time in Patent Office: 349 Days
• Field of Search: 219 50, 219 54, 219 911, 219 6913, 219 6918, 219137 PS, 219136, 2191377, 21913771
• CPC Class Codes: B23K 9/0673 Ionisation of the arc gap by means of a tension with a step front (pulses or high frequency tensions)
• CPC Class Codes: B23K 9/073 Stabilising the arc
• CPC Class Codes: B23K 9/09 Arrangements or circuits for arc welding with pulsed current or voltage
• CPC Class Codes: B23K 9/10 Other electric circuits therefor; Protective circuits; Remote controls

Abstract

Systems and methods for providing an improved start in a welding process are provided. The system may include a power circuit and a control circuit. The power circuit can generate a welding output power. The control circuit may be in communication with the power circuit to control, during the start of the welding process, at least one welding parameter until the control circuit determines that welding energy output exceeds an energy output threshold.

Claims

1. A method for generating a weld during a start of a welding process, the method comprising:

initially generating a welding output power by a control circuit, wherein the control circuit is configured to simultaneously limit a current and increase an inductance from an initial start of the welding process;

continuously determining a welding energy output or a first period of time that the welding output power is provided;

determining a second period of time for providing a current pulse, the second period of time is based on a run-in percentage of a wire feed speed and an output voltage, and a magnitude of the current pulse varies during the second period of time; and

providing a normal welding parameter after either;

the welding energy output exceeds an energy output threshold, or the first period of time exceeds a time threshold.

2. The method of claim 1, wherein the control circuit is configured to simultaneously offset a voltage while limiting the current and increasing the inductance from the initial start of the welding process.

3. The method of claim 1, further comprising:

calculating the welding output power based on a measured current and a measured voltage; and

determining the welding energy output by calculating a time integral of the welding output power.

4. The method of claim 1, wherein the control circuit continuously determines the welding output power if the welding output power does not exceed the energy output threshold.

5. The method of claim 1, wherein the control circuit continuously determines the welding output power if the first period of time has not exceeded the time threshold.

6. The method of claim 1, wherein the energy output threshold is predefined.

17. The method of claim 1, wherein the magnitude of the current pulse has a maximum magnitude at a start of the second period of time and decreases to a value of approximately zero at an end of the second period of time.

18. The method of claim 17, wherein the magnitude of the current pulse decreases linearly.

19. The method of claim 17, wherein the magnitude of the current pulse decreases nonlinearly.

20. The method of claim 1, wherein the control circuit limits the current until the welding energy output exceeds the energy output threshold.

7. A method for expediting process stabilization during weld startup, the method comprising:

receiving, at a control circuit, welding parameter inputs, the welding parameter inputs including a run-in percentage of a wire feed speed from a run-percentage input, and an output voltage from a voltage input;

determining, by the control circuit, a predefined period of time to apply a current pulse, the predefined period of time is based on the run-in percentage and the output voltage;

determining, by the control circuit, a magnitude of the current pulse; and

providing, by the control circuit, the current pulse for the predefined period of time.

8. The method of claim 7, wherein the welding parameter inputs further comprises:

the wire feed speed;

an inductance;

a burn-back time;

or

a wire sharp setting.

9. The method of claim 7, wherein the magnitude of the current pulse is independent of the welding parameter inputs.

10. The method of claim 7, wherein the current pulse includes a maximum magnitude at a start of the predefined period of time and decreases linearly as a function of time to a magnitude of zero at an end of the predefined period of time.

11. The method of claim 7, wherein the current pulse includes a maximum magnitude at a start of the predefined period of time and decreases nonlinearly to a magnitude of zero at an end of the predefined period of time.

12. A method for expediting process stabilization during weld startup, the method comprising:

receiving, at a control circuit, welding parameter inputs, the welding parameter inputs including a run-in percentage of a wire feed speed from a run-percentage input, and an output voltage from a voltage input;

determining, by the control circuit, a peak magnitude of a current pulse, the peak magnitude occurring at a start of a predefined period of time, the predefined period of time is based on the run-in percentage and the output voltage; and

providing, by the control circuit, the current pulse having the peak magnitude.

13. The method of claim 12, wherein the welding parameter inputs further comprises:

the wire feed speed;

an inductance;

a burn-back time;

or

a wire sharp setting.

14. The method of claim 12, wherein the peak magnitude of the current pulse remains constant throughout the predefined period of time.

15. The method of claim 12, wherein the peak magnitude of the current pulse decreases linearly as a function of time to a magnitude of zero at an end of the predefined period of time.

16. The method of claim 12, wherein the peak magnitude of the current pulse decreases nonlinearly to a magnitude of zero at an end of the predefined period of time.