Method and arrangement for optical inspection of a weld seam
First Claim
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1. A method of inspecting a stepped weld seam formed by the welding together of sheet-metal blanks of uneven thickness along a common edge, comprising the steps of:
- projecting at least one line of light to extend transversely across said weld seam;
taking a first view of said weld seam and said projected light by means of a camera viewing said seam approximately perpendicularly to the plane of said blanks;
taking a second view of said weld seam and said projected light by means of a camera viewing said seam from the side and facing towards the thicker of said blanks; and
evaluating said first and second views of said seam.
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Abstract
In the welding together of sheet-metal blanks an image of a line pattern projected across the weld seam is captured by a camera and evaluated to inspect the weld seam. For improved inspection, a sidewards view of the weld seam is obtained, eg. by means of a prism, in addition to the view from above. This affords an improved and more accurate inspection of the weld seam.
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Citations
13 Claims
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1. A method of inspecting a stepped weld seam formed by the welding together of sheet-metal blanks of uneven thickness along a common edge, comprising the steps of:
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projecting at least one line of light to extend transversely across said weld seam; taking a first view of said weld seam and said projected light by means of a camera viewing said seam approximately perpendicularly to the plane of said blanks; taking a second view of said weld seam and said projected light by means of a camera viewing said seam from the side and facing towards the thicker of said blanks; and evaluating said first and second views of said seam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Arrangement for inspecting a weld seam from the welding together of sheet-metal blanks along a common edge, comprising at least one device for projecting at least one line of light extending transversely across the seam, a camera and an evaluation unit connected thereto, the camera being positioned so as to capture a view of the weld seam from above in the region of said projected line, characterised in that a second camera is provided which is arranged so as to capture the weld seam from the side in the region of the projected line or lines.
- 11. Arrangement for inspecting a weld seam resulting from the welding together of sheet-metal blanks along a common edge, comprising at least one device for projecting at least one line of light extending transversely across the seam, a camera and an evaluation unit connected thereto, the camera being positioned so as to capture a view of the weld seam from above in the region of the projected line or lines, characterised in that at least one optical element is provided through which the camera arranged above the weld seam to capture the view from above also captures a sidewards view of the weld seam in the region of the projected line or lines.
Specification