Method and system for weld process monitoring

• US 6,696,660 B2
• Filed: 07/20/2001
• Issued: 02/24/2004
• Est. Priority Date: 07/20/2001
• Status: Expired due to Term

• Current Assignee: Ent Services Development Corporation LP (DXC Technology Company)
• Original Assignee: Electronic Data Systems Corporation (Perspecta, Inc.)
• Inventors: Nastasi, John D. Jr.
• Primary Examiner(s): Elve, M. Alexandra
• Assistant Examiner(s): MCHENRY, KEVIN L
• Application Number:
  US09/910,394
• Publication Number:
  US 20030015501A1
• Time in Patent Office: 949 Days
• Field of Search: 219/86.41, 219/109, 219/110, 219/91.1, 219/119, 219/120, 73/17.5, 73/17.9
• US Class Current: 219/109
• CPC Class Codes: B23K 11/252 using digital means
• CPC Class Codes: B23K 11/3063 Electrode maintenance, e.g. cleaning, grinding
• CPC Class Codes: B23K 11/31 Electrode holders and actuating devices therefornot restricted to resistance welding or severing by resistance heating B23K37/02
• CPC Class Codes: B23K 11/36 Auxiliary equipment B23K11/31 takes precedence

Abstract

A weld tip testing head is presented. An alignment member has an aperture disposed therein and is coupled to a spring element. The spring element is further coupled to a mounting. The aperture is operable to removably receive a weld tip and the alignment member is operable to determine an alignment associated with the weld tip. Computer software is encoded on storage. The computer software is operable to receive the alignment from the alignment member and analyze the alignment with respect to at least one expected alignment value. The computer software is further operable to generate an alarm based on the analysis and generate a fault based on the analysis.

Claims

1. A weld tip testing head comprising:

a first alignment member;

a first spring element having first and second ends, the first end coupled to the first alignment member, and the second end couple to a mounting;

a first sensor element coupled to the mounting;

wherein the first spring element is operable to be compressed in response to a weld tip contacting the first alignment member;

wherein the first sensor element is operable to measure a first alignment associated with the weld tip;

a second alignment member;

a second spring element having first and second ends, the first end coupled to the second alignment member, and the second end coupled to the mounting;

a second sensor element coupled to the mounting;

wherein the second spring element is operable to be compressed in response to the weld tip contacting the second alignment member;

wherein the first and second alignment members form an aperture operable to removably receive the weld tip; and

wherein the second sensor element is operable to measure a second alignment associated with the weld tip.

4. The weld tip testing head according to claim 1, wherein the weld tip comprises a pair of weld tips and further comprising:

a pressure sensor operable to determine a squeeze force associated with the weld tips, the pressure sensor coupled to the mounting; and

a heat sensor operable to determine a temperature associated with the weld tip, the heat sensor coupled to the mounting.

5. The weld tip testing head according to claim 1, wherein the first alignment member comprises a washer.

6. The weld tip testing head according to claim 1, wherein the first alignment member further operates to depress in response to contact with the weld tip and wherein the first spring element causes generation of a piezo-electric charge in response to being depressed.

7. The weld tip testing head according to claim 1 and further comprising a plurality of the weld tips.

8. The weld tip testing head according to claim 1, wherein the first alignment member comprises a generally circular element and a size of an aperture disposed within the generally circular element is based on an alignment tolerance associated with the weld tip.

2. A weld tip testing head comprising:

a first alignment member;

a first spring element coupled to the alignment member;

the first spring element being further coupled to a mounting; and

computer software encoded on storage;

wherein the first alignment member is operable to determine a first alignment associated with the weld tip, wherein if the weld tip is out of alignment the first spring element is compressed; and

wherein the computer software is operable to;

receive the first alignment from the first alignment member;

analyze the first alignment with respect to at least one expected alignment value;

generate an alarm based on the analysis; and

generate a fault based on the analysis.

3. The weld tip testing head according to claim 2, wherein the computer software is further operable to:

generate the alarm when the first alignment is outside a range of expected alignments, the expected alignments indicating proper values for the first alignment and the alarm indicating that a problem may soon occur; and

generating the fault when the alarm is within a range of fault alignments, the fault alignments indicating values associated serious mis-alignment of the weld tip.

9. A weld process monitor comprising:

a pressure sensor operable to determine a squeeze force associated with a weld tip, the pressure sensor coupled to a mounting;

a heat sensor operable to determine a temperature associated with the weld tip, the heat sensor coupled to the mounting;

an alignment member having an aperture disposed therein and coupled to a spring element, the spring element being further coupled to the mounting, wherein the aperture is operable to removably receive the weld tip and wherein the alignment member is operable to determine an alignment associated with the weld tip; and

computer software encoded on storage and operable to;

analyze at least one of the squeeze force, the temperature and the alignment with respect to at least one expected value;

generate an alarm based on the analysis;

generate a fault based on the analysis;

wherein the alarm indicates that a problem may soon occur; and

wherein the fault indicates a serious problem.

10. The weld process monitor according to claim 9, wherein the pressure sensor comprises one of a strain gauge or a mechanical sensor and wherein the heat sensor comprises one of an infrared sensor or a thermocouple.

11. The weld process monitor according to claim 9, wherein the alignment member comprises a washer.

13. The weld process monitor according to claim 9, wherein the computer software is further operable to:

compare one of the squeeze force, the temperature or the alignment to one of a range of fault squeeze forces, a range of fault temperatures or a range of fault alignments;

generate the fault when one of the squeeze force, the temperature or the alignment is respectively within one the range of fault squeeze forces, the range of fault temperatures or the range of fault alignments, the fault including at least one of the squeeze force, the temperature and the alignment and at least one of the range of fault squeeze forces, the range of fault temperatures and the range of fault alignments; and

communicate the fault to an appropriate recipient.

14. The weld process monitor according to claim 9, wherein the alignment member is operable to determine the alignment of the weld tip in response to the weld tip touching the alignment member and moving the alignment member on the spring element.

15. The weld process monitor according to claim 14, wherein the alignment member further operates to depress in response to contact with the weld tip and wherein the spring element causes generation of a piezo-electric charge in response to being depressed.

16. The weld process monitor according to claim 15, wherein movement of the alignment member is detected by a laser.

17. The weld process monitor according to claim 9, and further comprising a plurality of the weld tips.

18. The weld process monitor according to claim 9, wherein the alignment member comprises a generally circular element and a size of the aperture is based on an alignment tolerance associated with the weld tip.

19. The weld process monitor according to claim 9, wherein the aperture is generally circular.

12. The weld process monitor according to claims wherein the computer software is further operable to:

compare one of the squeeze force, the temperature or the alignment to one of a respective range of expected squeeze forces, a range of expected temperatures or a range of expected alignments;

generate the alarm when one of the squeeze force, the temperature or the alignment exceeds one of the range of respective expected squeeze forces, expected temperatures or expected alignments, the alarm including one of the squeeze force, the temperature or the alignment and one of the range of expected squeeze forces, expected temperatures or expected alignments; and

communicate the alarm to an appropriate recipient.

20. A method for weld process monitoring comprising:

determining an alignment of a weld tip;

analyzing the alignment with respect to at least one expected value for the alignment;

generating an alarm based on the analysis;

generating a fault based on the analysis;

wherein the alarm indicates that a problem may soon occur; and

wherein the fault indicates a serious problem.

21. The method according to claim 20, wherein determining the alignment of the weld tip comprises detecting movement of an alignment sensor by the weld tip and communicating the alignment to a control system.

22. The method for weld process monitoring according to claim 20 and further comprising:

determining a temperature of the weld tip;

determining a squeeze force capacity of the weld tip; and

analyzing the temperature and the squeeze force with respect to at least one expected value.

23. The method according to claim 22, wherein determining the temperature of the weld tip comprises measuring the heat radiated from the weld tip using an infrared sensor and communicating the temperature to a control system.

24. The method according to claim 22, wherein determining the squeeze force comprises measuring the pressure of the weld tip at a strain gauge in response to impact of the weld tip against the strain gauge and communicating the squeeze force to a control system.

25. The method according to claim 21, wherein analyzing the alignment comprises comparing the alignment to a range of expected alignments.

26. The method according to claim 21, wherein the analysis further comprises comparing one of the squeeze force, the temperature or the alignment to one of a respective range of expected squeeze forces, expected temperatures or expected alignments, and wherein generating the alarm further comprises:

generating the alarm when one of the squeeze force, the temperature or the alignment exceeds one of the range of respective expected squeeze forces, expected temperatures or expected alignments, the alarm including one of the squeeze force, the temperature or the alignment and one of the range of expected squeeze forces, expected temperatures or expected alignments; and

communicating the alarm to an appropriate recipient.

27. The method according to claim 21, wherein the analysis further comprises comparing one of the squeeze force, the temperature or the alignment to one of a range of fault squeeze forces, a range of fault temperatures or a range of fault alignments, and wherein generating the fault further comprises:

generating the fault when one of the squeeze force, the temperature or the alignment is respectively within one the range of fault squeeze forces, the range of fault temperatures or the range of fault alignments, the fault including at least one of the squeeze force, the temperature and the alignment and at least one of the range of fault squeeze forces, the range of fault temperatures and the range of fault alignments; and

communicating the fault to an appropriate recipient.

28. The method according to claim 27, wherein the appropriate recipient comprises a system administrator.

29. A weld tip testing head comprising:

a first alignment member;

a first spring element coupled to the first alignment member;

the first spring element being further coupled to a first face of a mounting;

a first sensor element coupled to the first face of the mounting;

wherein the first spring element is operable to be compressed in response to a first weld tip contacting the first alignment member;

wherein the first sensor element is operable to determine a first alignment associated with the first weld tip;

a second alignment member;

a second spring element coupled to the second alignment member;

the second spring element being further coupled to the first face of the mounting;

a second sensor element coupled to the first face of the mounting;

wherein the second spring element is operable to be compressed in response to the first weld tip contacting the second alignment member;

wherein the second sensor element is operable to determine a second alignment associated with the first weld tip;

wherein the first and second alignment members form an aperture operable to removably receive the first weld tip;

a third alignment member;

a third spring element coupled to the third alignment member;

the third spring element being further coupled to a second face of the mounting;

a third sensor element coupled to the second face of the mounting;

wherein the third spring element is operable to be compressed in response to a second weld tip contacting the third alignment member;

wherein the third sensor element is operable to determine a third alignment associated with the second weld tip;

a fourth alignment member;

a fourth spring element coupled to the fourth alignment member;

the fourth spring element being further coupled to the second face of the mounting;

a fourth sensor element coupled to the second face of the mounting;

wherein the fourth spring element is operable to be compressed in response to the second weld tip contacting the fourth alignment member;

wherein the fourth sensor element is operable to determine a fourth alignment associated with the second weld tip; and

wherein the third and fourth alignment members define a second aperture operable to receive the second weld tip.