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Title: Method and apparatus for real time weld monitoring

Patent ·
OSTI ID:871168
 [1];  [2]
  1. Lemont, IL
  2. Bolingbrook, IL
+ Show Author Affiliations

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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
DOE Contract Number:
W-31109-ENG-38
Assignee:
University of Chicago (Chicago, IL)
Patent Number(s):
US 5674415
OSTI ID:
871168
Country of Publication:
United States
Language:
English

References (13)

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conference January 1992
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conference January 1992
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conference January 1994
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Related Subjects

method
apparatus
time
weld
monitoring
improved
provided
infrared
signature
emitted
hot
surface
welding
detected
compared
steady
conditions
result
correlated
penetration
signal
processing
simpler
acoustic
techniques
changes
process
transmitted
laser
beam
power
quality
positioning
change
resulting
features
temperature
direction
amount
emissions
monitored
sensitive
detecting
appropriate
wavelength
region
wavelength region
surface feature
surface features
infrared emission
signal processing
improved method
laser beam
beam power
resulting weld
weld penetration
appropriate wavelength
signal process
detecting apparatus
weld monitoring
time weld
weld monitor
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