Abstract
This study considers the development and analysis of various welding parameters on the weldability of structural steel lap joints. The specimens of structural steel S355 were welded at different welding speeds, focal point positions, laser powers, and heat inputs. Welding was performed with a 10 kW IPG fiber laser. The predicted conditions for keyhole stability as well as the microstructure of joints, penetration depth, and microhardness distribution on the cross-section of the welded joints are analyzed. The mechanical properties of lap joints in different welding modes are also reported. The results of the hardness measurements show that the hardness level of the fusion zone is up to 1.5 times higher than the base metal hardness. By the analysis of the double welded lap joints, it is revealed that due to preheating during the first weld, second weld has deeper penetration, lower weld hardness, and minimized formation of solidification cracks in the weld. In addition, the importance of the focal point position in the lap joint quality is also reported.
Published Version
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