Electric heating – Metal heating – By arc
Patent
1996-01-22
1997-10-07
Evans, Geoffrey S.
Electric heating
Metal heating
By arc
21912163, 21912164, B23K 2604
Patent
active
056744153
ABSTRACT:
An improved method and apparatus are provided for real time weld monitoring. An infrared signature emitted by a hot weld surface during welding is detected and this signature is compared with an infrared signature emitted by the weld surface during steady state conditions. The result is correlated with weld penetration. The signal processing is simpler than for either UV or acoustic techniques. Changes in the weld process, such as changes in the transmitted laser beam power, quality or positioning of the laser beam, change the resulting weld surface features and temperature of the weld surface, thereby resulting in a change in the direction and amount of infrared emissions. This change in emissions is monitored by an IR sensitive detecting apparatus that is sensitive to the appropriate wavelength region for the hot weld surface.
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Hunter Boyd V.
Leong Keng H.
Evans Geoffrey S.
The University of Chicago
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