Cause for Fracturing of Welding Seam of Laser Tailor Welded Differentially Thick Plate
In order to determine the cause of fracturing in the weld of laser tailor welded differentially thick plate,the mechanical properties and microstructure of 22MnB5 steel after laser tailor welding were analyzed by Vickers hardness tester,electronic universal testing machine,optical microscope,scanning electron microscope and energy dispersive spectrometer,the modes and mechanisms of failure were also analyzed.The results showed that the Al-Si coating melted into the weld during the welding;with the enrichment of aluminium elements in the weld,the increase in 8-ferrite content reduced the plasticity of the weld,thus leading to the tensile specimen fracturing in the weld.
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