Higher strength steels could be used to produce thin sheets since they allow greater load capacity. Laser welding is suitable for welding those thin sheets. Higher power density in laser welding enables welding with a lower specific heat input, but it leads to very high cooling rates, thus increasing the hardness. In this experiment, Nd:YAG laser was used to weld 2 mm thick heat-treatable steel sheets 25CrMo4 and 42CrMo4. These are alloys with higher strength, but also with increased carbon content (and accordingly higher hardness). Carbon is known for its tendency to decrease the weldability of the steel, which is usually a problem in the application of steel grades like these two. Different welding parameters were tested and its influence on geometrical characteristics and microstructure of welded joints is discussed

Higher strength steels could be used to produce thin sheets since they allow greater load capacity. Laser welding is suitable for welding those thin sheets. Higher power density in laser welding enables welding with a lower specific heat input, but it leads to very high cooling rates, thus increasing the hardness. In this experiment, Nd:YAG laser was used to weld 2 mm thick heat-treatable steel sheets 25CrMo4 and 42CrMo4. These are alloys with higher strength, but also with increased carbon content (and accordingly higher hardness). Carbon is known for its tendency to decrease the weldability of the steel, which is usually a problem in the application of steel grades like these two. Different welding parameters were tested and its influence on geometrical characteristics and microstructure of welded joints is discussed

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