Method and apparatus for inspecting and analyzing welded structures

• US 7,783,100 B2
• Filed: 03/21/2007
• Issued: 08/24/2010
• Est. Priority Date: 03/21/2007
• Status: Expired due to Fees

• Current Assignee: Topy America, Inc. (TOPY Industries Limited)
• Original Assignee: Topy America, Inc. (TOPY Industries Limited)
• Inventors: Carpenter, Keith, Byington, Stephen
• Primary Examiner(s): Strege; John B
• Application Number:
  US11/726,228
• Publication Number:
  US 20080234960A1
• Time in Patent Office: 1,252 Days
• Field of Search: 382/141, 382/152, 702/35, 348/86, 348/125, 700/166, 700/212
• US Class Current: 382/141
• CPC Class Codes: G01B 11/25 by projecting a pattern, e.g. one or more lines, moiré fringes on the object G01B11/255 takes precedence ; image analysis for depth or shape recovery G06T7/50
• CPC Class Codes: G01N 21/95 characterised by the material or shape of the object to be examined G01N21/89 - G01N21/91, G01N21/94 take precedence

Abstract

An apparatus and method for inspecting and analyzing welded structures includes a laser for directing at least one beam of light at a weld bead to define at least one visible profile line; a camera directed at the weld bead for capturing an image of the at least one profile line and generating a usable image signal based on the image; and a preprogrammed microprocessor assembly configured for receiving the usable image signal and processing the signal as an image to determine a dimension of the weld bead defined along the at least one profile line and comparing the dimension of the weld bead with a predetermined dimension set point to determine the quality of the weld bead.

Claims

1. An apparatus for inspecting and analyzing welded structures comprising:

a laser for directing at least one beam of light at a weld bead formed on at least two workpieces joined by said weld in a predetermined manner to define at least one visible profile line, said at least one profile line extending along at least a portion of each workpiece and along a full dimension of said weld bead;

a camera directed at said weld bead for capturing an image of said at least one laser light beam forming said at least one profile line and generating a usable image signal based on said image; and

a preprogrammed microprocessor assembly configured for;

receiving said usable image signal and processing said signal as an image;

locating at least one profile line on said image;

locating said weld bead along said at least one profile line;

determining a dimension of said weld bead defined along said at least one profile line;

comparing said length of said weld bead with a predetermined dimension set point to determine the quality of said weld bead;

locating a first straight portion of said at least one profile line extending for a predetermined distance without curving on said image to identify a first workpiece portion;

determining a weld start point by determining where said first straight portion of said at least one profile line begins to curve;

defining a first weld dimension line extending tangent to said at least one profile line at said weld start point;

locating a second straight portion of said at least one profile line extending for a predetermined distance without curving on said image to identify a second workpiece portion;

determining a weld bead endpoint by determining where said second straight portion of said at least one profile line begins to curve; and

defining a second weld dimension line extending tangent to said at least one profile line at said weld bead endpoint, wherein said first and second weld bead lines intersect at a weld bead midpoint.

2. An apparatus for inspecting and analyzing welded structures according to claim 1 wherein said preprogrammed microprocessor assembly is further configured for:

determining a dimension of said weld bead defined as the sum of a distance from said weld start point to said weld bead midpoint and a distance from said weld bead midpoint to said weld bead endpoint.

3. An apparatus for inspecting and analyzing welded structures according to claim 1 wherein said first workpiece is a wheel disc and said second workpiece is a wheel rim, and wherein said laser is configured to produce at least one profile line directed laterally across said wheel disc and said wheel rim and a junction thereof.

4. An apparatus for inspecting and analyzing welded structures according to claim 1 wherein said laser is configured to produce three generally parallel profile lines and said microprocessor assembly is configured to determine a weld dimension as determined from an average of the results obtained from said three profile lines.

5. An apparatus for inspecting and analyzing welded structures according to claim 1 wherein said apparatus is configured to perform measurements of weld dimension at a plurality of positions along said workpieces.

6. An apparatus for inspecting and analyzing welded structures according to claim 2 wherein said apparatus is configured to perform measurements of weld dimension at twelve positions disposed around said wheel rim and said wheel disc.

7. An apparatus for inspecting and analyzing welded structures according to claim 1 wherein said microprocessor assembly is configured to compare said weld bead dimension with at least two separate set points to determine quality of said weld bead.

11. An apparatus for inspecting and analyzing welded structures according to claim 1 wherein said laser is configured to produce three generally parallel profile lines and said microprocessor assembly is configured to calculate a weld dimension as determined from an average of the results obtained from said three profile lines.

8. An apparatus for inspecting and analyzing welded wheel structures comprising:

a laser for directing at least one beam of light at a weld bead formed on at least two workpieces comprising a wheel disc and a wheel rim joined by said weld bead in a predetermined manner to define at least one visible profile line, said at least one profile line extending along at least a portion of each of said wheel disc and said wheel rim and along a full dimension of said weld bead;

a camera directed at said weld bead for capturing an image of said at least one laser light beam forming said at least one profile line and generating a usable image signal based on said image; and

a preprogrammed microprocessor assembly configured for;

receiving said usable image signal and processing said signal as an image;

locating at least one profile line on said image;

locating said weld bead along said at least one profile line;

determining a dimension of said weld bead defined along said at least one profile line;

comparing said dimension of said weld bead with a predetermined dimension set point to determine quality of said weld bead;

locating a first straight portion of said at least one profile line extending for a predetermined length without curving on said image to identify a wheel disc portion;

determining a weld start point by determining where said first straight portion of said at least one profile line begins to curve;

defining a first weld dimension line extending tangent to said at least one profile line at said weld start point;

locating a second straight portion of said at least one profile line extending for a predetermined length without curving on said image to identify a wheel rim portion;

determining a weld bead end point by determining where said second straight portion of said at least one profile line begins to curve; and

defining a second weld dimension line extending tangent to said at least one profile line at said weld bead end point, wherein said first and second weld bead lines intersect at a weld bead midpoint.

9. An apparatus for inspecting and analyzing welded structures according to claim 8 wherein said preprogrammed microprocessor assembly is further configured for:

determining a dimension of said weld bead defined as the sum of a distance from said weld start point to said weld bead midpoint and a distance from said weld bead midpoint to said weld endpoint.

10. An apparatus for inspecting and analyzing welded structures according to claim 8 wherein said laser is configured to produce at least one profile line directed laterally across said wheel disc and said wheel rim and a junction thereof.

12. An apparatus for inspecting and analyzing welded structures according to claim 8 wherein said apparatus is configured to perform measurements of weld dimension at a plurality of positions disposed around said wheel disc and said wheel rim.

13. An apparatus for inspecting and analyzing welded structures according to claim 8 wherein said apparatus is configured to perform measurements of weld dimension at twelve positions disposed around said wheel disc and said wheel rim.

14. An apparatus for inspecting and analyzing welded structures according to claim 8 wherein said microprocessor assembly is configured to compare a weld bead dimension with at least two separate set points to determine quality of said weld bead.

15. A method for inspecting and analyzing welded structures comprising the steps of:

providing a laser for directing at least one beam of light at a weld bead formed on at least two workpieces joined by said weld bead in a predetermined manner;

defining at least one visible profile line using said laser, said at least one profile line extending along at least a portion of each said workpiece and along a full dimension of said weld bead;

providing a camera directed at said weld bead;

capturing an image, using said camera of said at least one laser light beam forming said at least one profile line and generating a usable image signal based on said image; and

providing a preprogrammed microprocessor assembly configured for receiving said usable image signal and processing said signal as an image to determine quality of said weld bead, said processing including the steps of;

locating at least one profile line on said image;

locating said weld bead along said at least one profile line;

determining a dimension of said weld bead defined along said at least one profile line;

comparing said dimension of the weld bead to a predetermined dimension set point to determine quality of said weld bead;

locating a first straight portion of said at least one profile line extending for a predetermined length without curving on said image to identify a first workpiece portion;

determining a weld start point by determining where said first straight portion of said at least one profile line begins to curve;

defining a first weld dimension line extending tangent to said at least one profile line at said weld start point;

locating a second straight portion of said at least one profile line extending for a predetermined length without curving on said image to identify a second workpiece portion;

determining a weld end point by determining where said second straight portion of said at least one profile line begins to curve; and

defining a second weld dimension line extending tangent to said at least one profile line at said weld end point, wherein said first and second weld bead lines intersect at a weld bead midpoint.

16. A method for inspecting and analyzing welded structures according to claim 15 and further comprising the following processing steps using said preprogrammed microprocessor assembly:

determining a dimension of said weld bead defined as the sum of a distance from said weld start point to said weld bead midpoint and a distance from said weld bead midpoint to said weld bead end point.

17. A method for inspecting and analyzing welded structures according to claim 15 wherein said at least two workpieces further comprise a first workpiece being a wheel disc and a second workpiece being a wheel rim, and wherein said step of defining at least one profile line includes defining at least one profile line directed laterally across said wheel disc and said wheel rim and a junction thereof.

18. A method for inspecting and analyzing welded structures according to claim 15 wherein said step of defining at least one visible profile line includes defining three generally parallel profile lines and said step of determining a dimension of said weld bead includes determining a weld dimension from an average of results obtained from said three profile lines.

19. A method for inspecting and analyzing welded structures according to claim 15 wherein said method steps are repeated to perform measurements of weld dimension at a plurality of positions along said workpieces.

20. A method for inspecting and analyzing welded structures according to claim 15 wherein said method steps are repeated to perform measurements of weld dimension at twelve positions disposed around said wheel rim and said wheel disc.

21. A method for inspecting and analyzing welded structures according to claim 15 wherein said step of comparing said dimension of said weld bead with at least one predetermined set point includes comparing said dimension of said weld bead with at least two separate set points to determine quality of said weld bead.

22. A method for inspecting and analyzing welded structures according to claim 21 wherein said step of comparing said dimension of said weld bead with at least two separate set points includes comparing said dimension of said weld bead to a first set point representing a welding torch position and a second set point representing a position of said workpieces to determine quality of said weld bead.