Cladding and welding using a laser can be fast and precise processes. Quality control is usually achieved by “open loop” adjustment of the laser process to the particular application. Each application requires the development of a new procedure. This paper looks at the conditions under which closed loop control of laser processes is practical. If on-line, closed loop control is not possible then quality control can only be achieved by on-line monitoring and then accepting or rejecting the work after processing.

1.
Steen
,
W.M.
 (
1998
)
Laser Material Processing
,
SPRINGER-VERLAG
,
London
, 1998.
Google Scholar
Crossref
Search ADS
 
2.
Duley
,
W.W.
 (
1998
)
Laser Welding
,
John Wiley and Sons
,
New York
.
Google Scholar
 
3.
Norrish
,
J.
 (
1992
)
Advanced Welding Processes
,
Pub. Institute of Physics
, ISBN 0-85274-326-2.
Google Scholar
 
4.
Kaye
,
G.W.C.
, and
Laby
,
T.H.
, (
1986
)
Tables of Physical and Chemical Constants
, 15 ed.
London
,
Longman
.
Google Scholar
 
5.
Deam
,
R.T.
,
Brandt
,
M.
, &
Harris
,
J.
 (
2003
)
Investigation of capillary waves excited by a Nd:YAG laser using pyrometry
,
Journal of Physics D: Applied Physics
Vol.
36
, pp
2435
–
2445
.
https://doi.org/10.1088/0022-3727/36/20/003
Google Scholar
Crossref
Search ADS
 
6.
Prokoshev
,
V.G.
,
Abramov
,
D.V.
,
Danilov
,
S.Y.
,
Kucherik
,
A.O.
, &
Arakelian
,
S.M.
 (
2001
)
Diagnostics of the high temperature hydrodynamic phenomena for laser processing of the material
,
Laser Assisted Net Shape Engineering 3, Proceedings of the LANE 2001
pp
245
–
250
.
Google Scholar
 
7.
Haferkamp
,
H.
,
Goede
,
M.
, &
Lindemann
,
K.
 (
2000
)
Laser Hardening of CVD coated tool steel
,
12th International Federation for Heat Treatment and Surface Engineering Congress
(
Melbourne
,
November 2000
)
Google Scholar
 
8.
Smith
,
E.T.
, &
Kannatey-Asibu
,
E.
 (
1999
)
Visualization and Acoustic Monitoring of Laser Weld Pool Oscillatory Behavior
,
Proceedings of ICALEO 1999
, Vol.
87
Laser Materials Processing Section D pp
1
–
10
,
pubs Laser Institute of America
.
Google Scholar
Crossref
Search ADS
 
9.
Grunenwald
,
B.
,
Shen
,
J.
,
Dausinger
,
F.
, &
Hugel
,
H.
 (
1993
)
Laser cladding with composite powders using pyrometric temperature control and beam combination
,
Proceedings ISATA ’93 International Symposium on Automotive Technology and Automation
,
Aachen, Germany
, pp
287
–
294
.
Google Scholar
 
10.
Deam
,
R.T.
 (
1989
)
Weldpool frequency: A new way to define a weld procedure, Recent Trends in Welding Technology TWR ’89
,
Proceedings 2nd Int. Conf. on Trends in welding Gatlinburg
,
Tennessee, USA
May 1989
,
Pub. ASM International
.
Google Scholar
 
11.
Salter
,
R.J.
, &
Deam
,
R.T.
 (
1987
)
A practical frontface penetration control system
,
Proceedings of the 2nd International Conference on Developments in Automatic and Robotic Welding
,
The Welding Institute
,
London
,
Nov. 1987
.
Google Scholar
 
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