Method and apparatus for determining the position of a weld groo

Details Method and apparatus for determining the position of a weld groo Method and apparatus for determining the position of a weld groo

1989-09-08

1990-05-08

Albritton, C. L.

Electric heating

Metal heating

By arc

21912178, 21912183, B23K 2600

Patent

active

049240633

ABSTRACT:
A laser welding process includes the steps of deflecting, with an oscillating frequency of at least 100 Hz, a collimated and focused laser measuring beam, intensity-modulated with a frequency of at least 200 kHz, across the path of the weld groove during co-travel with the laser welding beam along the weld groove; directing the laser measuring beam to the workpieces; causing the laser measuring beam to impinge on the workpieces at a distance of maximum 10 mm from the central longitudinal axis of the laser welding beam; sensing, by an electro-optical sensor having a single light-sensitive element, rays of the laser measuring beam reflected by the workpieces; generating, by the sensor, measuring signals in response to the sensed reflected rays; applying follow-up signals in response to the measuring signals, and correcting the position of the laser welding beam by the follow-up device in response to the follow-up signals applied thereto.

REFERENCES:
patent: 3016464 (1962-01-01), Bailey
patent: 4667082 (1987-08-01), Shibata et al.
patent: 4700045 (1987-10-01), Merry et al.
patent: 4764655 (1988-08-01), Ortiz, Jr. et al.
patent: 4812614 (1989-03-01), Wang et al.
Beckmann, "Elektrooptischer Sensor fur due Automatisierung des Lichtbogenschweissens" (Electr-Optical Sensor for Use in Automated Arc Welding), 1984, Technisches Messen 51, No. 7/8, pp. 259-263.

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