A new system for process monitoring of laser beam welding based on a CMOS-camera was presented in former presentations [1,2,3]. The system observes the welding process online and coaxial to the laser beam. Until now we got some new experiences with this system in industrial applications.

On the basis of these experiences we found, that this system can be a useful tool for the inspection of the interaction zone during materials processing using a laser beam. The recorded films can be analyzed by the software of our system. The resulting curves are presented directly during the process. The data streams can be stored as an ASCII file and read in by another software.

The possibilities of our methods are illustrated by one example for a welding process with a ND-YAG laser beam.

The resulting images are interpreted as the absorption front. From the recorded images it is possible to conclude on the gradient of the front.

1.
J.
Beersiek
On-line monitoring of Keyhole Instabilities during Laser Beam Welding ICALEO 99
, Section D, pp.
49
58
2.
J
.
Beersiek
,
R.
Poprawe
,
W.
Schulz
,
H.
Gu
,
R.E.
Mueller
,
W.W.
Duley
On-line monitoring of penetration depth in laser beam welding ICALEO 97
3.
S
Kaierle
,
J.
Günnewig
,
R.
Poprawe
,
H.
Rake
Online control of penetration depth in laser beam welding
4.
Abels
P.
,
Kaierle
S.
,
Kratzsch
C.
Universal coaxial process control system for laser materials processing ICALEO
99, Section E, pp
99
108
5.
H.R.
Griem
Plasma Spectroscopy
McGraw-Hill Book Company
New York
,
1963
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