Research on Welding Technology of Magnetic Field Assisted Narrow-gap Laser Welding with Filler Wire
The multi-layer welding test of 25 mm thick S32101 dual-phase stainless steel plate was carried out by using the magnetic field assisted narrow-gap laser welding with filler wire,and the welding performance of the joint was studied.The weld forming of the narrow-gap laser wire filling welding with or without magnetic field was observed and compared,and the mechanical properties and metallographic structure of the joint under magnetic filed were analyzed.The results show that the weld surface is smooth and uniform with or without magnetic field,and there is almost no splash.Porosity and non-fusion defects appear in the welding seam without magnetic field,while the welding seam has no such defects under magnetic field.Tensile specimens prepared by magnetic field assisted welding all fracture at the base metal,and the tensile strength of the welded joint is higher than that of base metal.The average hardness of each layer weld is higher than that of the base metal.The metallographic structure of the weld is austenite and ferrite,the microstructure is fine and uniform,and the ratio of the two phases is uniform and stable,about 1:1.
magnetic fielddual-phase stainless steelnarrow-gap laser wire filler welding
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