One + one is more than two!

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One + one is more than two!

Lahti, Kari Erik

The laser hybrid welding process is introduced where laser beam welding is combined with assisting arc-welding processes such as TIG, MIG/MAG or Plasma. With this combined process an attractive overlapping zone is created: high-speed, full penetration, one-pass welds on thicknesses between 3 and 8 millimeters. High welding speeds result in low heat input and hence very low heat-induced deformation in welded structure. The low heat input is a benefit for welding materials sensitive to heat, in order to avoid microstructural changes. Duplex stainless steel and high strength steels are suitable application areas for laser hybrid welding. The process can be achieved with either CO2 lasers, or NdYAG lasers. But as NdYAG can be guided via optical cable NdYAG is, from a practical view, more flexible and can be used in robotic applications. Welding can be performed in all positions, but optimized welding conditions in the flat position give the best results. Since welding is done with multiaxis manipulators or by using welding robots, curved paths can be joined. Shipyards, car manufaturers, fabricators of earth moving equipment, lifting equipment and crane makers are industries where laser hybrid welding is applied. In the automative industry there are two main drivers for the use of the process: aluminium as a construction material, and the capability to manage larger tolerances than with laser welding. As the welds get longer and shapes more complicated, it is recommended that integrated seam tracking on the welding head is used. This ensures the correct positioning of the laser hybrid weld pool and is also a important factor for joint preparation.