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On-line plasma diagnostics for process-control in welding with CO2-laser

 
: Gatzweiler, W.; Maischner, D.; Beyer, E.

Quenzer, A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
High power CO2 laser systems and applications
Bellingham/Wash.: SPIE, 1989 (SPIE Proceedings Series 1020)
ISBN: 0-8194-0055-6
S.142ff.
European Congress on Optics (ECO) <1, 1988, Hamburg>
Englisch
Konferenzbeitrag
Fraunhofer ILT ()
beam diagnostic; delay-time; fluctuation; plasma diagnostic; plasma radiation; sound emission; vapour plasma

Abstract
During laser beam welding, a laser induced metal vapour plasma is formed. The plasma shows strong fluctuations combined with sound emission. The origin of these fluctuations is discussed. On-line control of the welding process is possible by measuring and analyzing the plasma emission with a photodiode and the sound emission with a microphone. Optical diagnostic methods are compared with acoustical methods. The results show that both diagnostic methods yield complementary information on the process. On-line control of the welding process is demonstrated for the influence of the process gas, hole formation in the seam and welding through.

: http://publica.fraunhofer.de/dokumente/PX-27123.html