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Model of dynamic behaviour in laser beam welding.

Modell des dynamischen Verhaltens beim Laserstrahlschweißen
: Gatzweiler, W.; Maischner, D.; Faber, F.J.; Derichs, C.; Beyer, E.

Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
High power lasers and laser machining technology
Bellingham/Wash., 1989 (Proceedings of SPIE 1132)
ISBN: 0-8194-0168-4
European Congress on Optics (ECO) <2, 1989, Paris>
Fraunhofer ILT ()
Druckvariation; dynamic model; dynamisch; Leuchtphänomen; luminous phenomenon; Modell; penetration welding; plasma fluctuation; Plasmaschwankung; pressure variation; radiation emission; Strahlemission; Tiefschweißen

Processes like plasma development and quenching modulation of evaporation rate, pressure variation, energy coupling or melt transport and their interdependence determine the welding process. The investigation of these processes with optical and acoustical methods is presented. When measuring the radiation of the luminous phenomenon in different wavelenght ranges, the transition from metal vapour to laser-induced plasma and vice as well as plasma density fluctuations in the keyhole are shown. This result is supported by measuring the pressure variations in the enviroment with a microphone. The case of full penetration welding is particularly investigated. In this case the luminous phenomenon below the workpiece and the CO2 radiation, transmitted through the keyhole is measured additionally. All these investigations result in a presented model. The model shows that the variation of the metal vapour density mainly determines the above-mentioned processes like energy coupling; pressure var iations and so on, and therefore has a great influence on laser beam welding.