Electric heating – Metal heating – By arc
Patent
1997-10-23
2000-05-09
Evans, Geoffrey S.
Electric heating
Metal heating
By arc
21912164, B23K 2602, B23K 2620
Patent
active
060606851
ABSTRACT:
A method for monitoring the quality of a laser process such as a laser welding process includes monitoring the light emitted from the weld plasma above the surface of the workpiece irradiated by the laser beam. The intensity of the light emitted from the plasma is compared to a predetermined value of the light emission as determined under process and workpiece conditions that produce welds of acceptable quality. Variations of the monitored light intensity greater than a preselected value can be valuated as unacceptable welds. Such variations can be caused by changes in the laser beam power, the workpiece speed, laser focusing problems, insufficient shield gas flow, workpiece deformation and weld contamination. The process monitors the light emission for a selected range of wavelengths that correspond to the major emission peaks of the light spectrum. The method enables in-process control of laser processes.
REFERENCES:
patent: 4687539 (1987-08-01), Burns et al.
patent: 4998005 (1991-03-01), Rathi et al.
patent: 5045669 (1991-09-01), Ortiz, Jr. et al.
patent: 5059761 (1991-10-01), Koegl et al.
patent: 5155329 (1992-10-01), Terada et al.
patent: 5247155 (1993-09-01), Steen et al.
patent: 5256852 (1993-10-01), Boudot
patent: 5272312 (1993-12-01), Jurca
patent: 5283416 (1994-02-01), Shirk
patent: 5286947 (1994-02-01), Clyde et al.
patent: 5304774 (1994-04-01), Durheim
patent: 5329091 (1994-07-01), Bissinger
patent: 5360960 (1994-11-01), Shirk
patent: 5446257 (1995-08-01), Sakamoto et al.
patent: 5486677 (1996-01-01), Maischner et al.
patent: 5506386 (1996-04-01), Gross
patent: 5961859 (1999-10-01), Chou et al.
Reference C (Translation from attached Article in Japanese, 1 page) "Light Dispersing Technique Handbook" published on Jan. 20, 1997, second revision, pp. 328 to 330.
Chou Mau-Song
Shih Christopher C.
Shirk Bryan W.
Evans Geoffrey S.
TRW Inc.
Yatsko Michael S.
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