The effects of MIG parameters on a laser hybrid process are explored in this paper. In particular, the correlation between the MIG arc length and seam parameters. Seam Parameters are the seam width and the root penetration of fillet welds on T-joints. By variation of MIG parameters, such as current, voltage, and frequency, an increase of root penetration of up to 30% is reached. Based on this data, the link between intensity of the MIG process, arc length, and root connection are worked out. The base material is made out of AlMg3Mn and the filler wire out of AlSi5.

This paper describes an investigation on laser-MIG hybrid welding of sheet metals. Material of the sheets is an AlMg3Mn aluminum alloy, with a thickness of 3.5 mm. The 2-D T-joint structures investigated have convex radii of 20 mm to 50 mm. These radii lead to temperature elevations during welding and subsequently to failures in the weld seam. For a description of this phenomenon, the 2-D T-joint structures have been modelled in Abaqus FEA. Based on this FEA model and its resulting understanding of the temperature elevations, a weld power reduction method has been developed. The reduction of power has to correlate with the extent of the elevated temperature. A further conclusion is the necessary expansion of the adjustment beyond radius start and end point. For smaller radii, due to heat flow and its heat accumulation, a greater expansion is necessary.