Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Spectroscopic study of laser-induced plasma in the welding process of steel and aluminium.

Spektroskopische Studie von laserinduziertem Plasma beim Schweißen von Stahl und Aluminium
 
: Beyer, E.; Herziger, G.; Sokolowski, W.

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>
English
Conference Paper
Fraunhofer ILT ()
Diagnose; diagnostic; Ionisationsstufe; ionization stage; laser radiation; Laserstrahlung; plasma; radiation; Schutzgas; Schweißprozeß; shielding gas; spectral; spectroscopy; spektral; Spektroskopie; Strahlung; welding process

Abstract
Laser welding experiments of thick metal sheets with a thickness of up to 20 mm at high power levels up to 20 kW beam power are reported. Due to the high intensity of the laser beam exceeding 10 high 7 Wcm high minus 2, the effect of plasma suppression by helium gas shielding was investigated. Furthermore, the welding parameters were determined for a laser beam power range between 10 and 20 kW. The first results indicate that an extrapolation of the laser welding parameters which already had been observed when welding at lower power levels smaller than 10 kW, is not applicable for the 20 kW range. Moreover, the influence of the welding speed on the porosity of the welding seam in low carbon steels of 20 mm sample thickness was slightly different from results of thin sheet welding with a thickness of less than 10 mm.

: http://publica.fraunhofer.de/documents/PX-34433.html