Light intensity weld monitor

Details Light intensity weld monitor Light intensity weld monitor

1993-08-06

1994-11-01

Albritton, C. L.

Electric heating

Metal heating

By arc

21912163, 21912164, B23K 2602

Patent

active

053609603

ABSTRACT:
A monitoring system monitors a laser process which delivers energy from a laser source (10) to a workpiece (18) along a process path while producing plasma at a beam delivery point (22) along the path. A light detector (26) is positioned for receiving light emitted from the plasma. The detector (26) provides a light signal having a value which varies with changes in the intensity of the received light over a predetermined test interval. A plurality of light limits (1-6) are established with each limit having a different value. The light signal is compared with each light limit and a violation indication is provided each time the light signal violates one of the limits. The number of violation indications for each limit are counted over the predetermined test interval. The laser process is evaluated as a function of the number of violation indications during the test interval. An output indication is provided as to the result of the evaluation.

REFERENCES:
patent: 3262006 (1966-07-01), Sciaky et al.
patent: 4446354 (1984-05-01), Kearney
patent: 4663513 (1987-05-01), Webber
patent: 4766285 (1988-08-01), Decgilloz et al.
patent: 5155329 (1992-10-01), Terada et al.

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