A hybrid welding operation combines laser welding (with CO2 or YAG:Nd lasers) and arc welding processes (TIG, MIG-MAG, or plasma welding) within the same operational zone. To optimise both the welding possibilities and the heat loading elements, the ISF (Institut für Schweisstechnische Fertigungsverfahren der RWTH Aachen) has developed a process known as HyDRA. This particular process combines laser radiation with two arc-welding processes. Steel plates of 5 mm, 8 mm, 12 mm and 20 mm thicknesses have been welded to determine the maximum width of the gap, which can be joined. The bonding of groove edges did not create any problems since the molten metal was not being discharged through the root of the weld. In the shipbuilding industry the hybrid welding appears to be a promising alternative. With the introduction of laser welding, the relevant recommendation is for the full depth of fusion to be provided in order that weld corrosion may be avoided and the maximum possible section be covered. The advantages of the hybrid and HyDRA processes are the possibility of the full melting of up to 2 mm wide groove edges and the need for only low levels of linear energy. The application of the hybrid welding to the making of tee and angle joints should be the subject for further investigations. The elimination of the solidification defect is the aim of future investigations into both the hybrid and laser beam welding.
Hybrid-welding and the HyDRA MAG + laser processes in shipbuilding
Welding International ; 17 , 10 ; 761-766
2003
6 Seiten, 12 Bilder, 17 Quellen
Aufsatz (Zeitschrift)
Englisch
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