Vision enhanced method for making a full round bushing
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United States of America Patent
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Jun 25, 1991
Issued Date -
N/A
app pub date -
Jul 9, 1990
filing date -
Jul 9, 1990
priority date (Note) -
Expired
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Abstract
A full round bushing is formed by laser welding opposed edges of a bimetal member deformed into a generally cylindical configuration. The laser beam parameters are closely controlled so as to limit any adverse affect on a bearing metal layer. The weld only reaches a depth approximately 20% to 75% of a steel reinforcing layer. The beam approaches the seam between opposed edges at an angle of incidence approximately 10.degree. to 45.degree. and at a laser focal point offset 5% to 70% of the spot diameter of the laser beam. An overlap of the pulse spot-welding approximately 50% to 75% is preferable. A machine vision control system is used to locate the seam, moving the bushing to position the seam as desired relative to the laser and to trigger the laser to perform the welding operation.
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