In joining technology the high welding speed on the one hand and the good gap-bridging ability on the other hand play a significant part. However, both features cannot be achieved by conventional laser welding processes. Therefore, a hybrid process is being applied - LaserHybrid welding or also called LaserBrazing. New possibilities and synergetic effects, however, are based on the combination of both processes. In the case of laser welding the gap-bridging ability is very low due to the small focus diameter; however, very high welding speeds can be achieved. MIG welding features a significantly lower energy density has a larger focused spot on the material surface and is characterized by its good gap-bridging ability. LaserBrazing including an automated brazing-wire feed-system represents a new joining process with low heat input. Laser beam brazing with its easily controllable and accurate energy input has a very high potential in this regard. The brazing seam itself, however, does not corrode. While laser arc welding is applied to Al, unalloyed, alloyed, and high-alloy steel, LaserBrazing is especially used with galvanized steels. The synergetic effects achieved by the absolutely new LaserHybrid technology open up a wide field of application in the jointing technology, especially where the tolerances of the jointing parts required for laser beam welding cannot be met or can only be met incurring high costs. Thanks to a considerable extension of the field of application and the efficiency of the combined process it is possible to reduce investment costs, fabrication time, and fabrication costs as well as to increase productivity. An increase in competitiveness is the result. The design is being offered new possibilities through narrower joint geometries. The hybrid welding process is the combination of the laser beam welding and the arc process with only one single process zone (plasma and weld pool). By selecting favorable process parameters the seam properties such as geometry and structural constitution can be purposefully influenced. The arc welding process increases the gap bridging ability due to the filler material added and determines the seam width and thus decreases the weld seam preparations.
Laser-MIG-Hybrid welding and case studies for the automotive industry
Sheet Metal Welding Conference, 12 ; 3/1-3/12
2006
12 Seiten, 12 Bilder, 14 Quellen
Conference paper
English
Laserstrahlschweißen , Metall-Inertgasschweißen , Hybridtechnik , Automobilindustrie , Schweißgeschwindigkeit , Brückenbildung , Energiedichte , Korrosion , Aluminium , Aluminiumlegierung , hochlegierter Stahl , Toleranz , Investitionskosten , Fertigungszeit , Produktivität , Verfahrensparameter , Schweißnaht , Nahtvorbereitung
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