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1. C. Gerritsen, J. Weldingh, and K. J. Klæstrup, “ Development of Nd:YAG Laser-MAG hybrid welding of T-joints for shipbuilding,” in Proceedings of the 10th Nordic Laser Materials Processing Conference, Lulea, Sweden (2005).
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5. A. Salminen, E. Lappalainen, and T. Purtonen, “ A study on basic phenomena in high power fiber laser welding of thick section low alloyed steel,” in Proceedings of 37th MATADOR Conference (2012), pp. 331336.
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The high power fiber laser has become one of the most efficient energy sources for deep penetration welding processes used in heavy manufacturing and marine industries. Combinations of cost-efficient, easily automatable process together with fairly mobile and flexible welding equipment have raised high expectations for improved quality and economic feasibility. In this study, the fillet welding of a low alloyed structural steel was studied using a 10 kW fiber laser. Plates of 8 mm thick AH36 were welded as a T-joint configuration in flat (1F) and horizontal (2F) positions using either an autogenous laser welding or a hybrid laser arc welding process. The effect of heat input on the weld bead geometry was investigated using one variable at a time approach. The impact of single process parameter such as laser power of 4.5–6 kW, welding speed of 0.5–2.5 m/min, beam inclination angle of 6°–15°, focal point position of −2 to +2 mm, and welding positions of 1F and 2F were studied. All welds were visually evaluated for weld imperfections described in EN ISO 13919-1 standard. Penetration depth, geometries of the fusion and heat affected zones, and hardness profiles were measured. Produced joints have a high depth to width ratio and a small heat affected zone; full penetration welds with acceptable weld quality on both sides of the joint were produced. The parameter configurations for optimizing the welding processes are proposed.


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