Research on the microstructure and properties of dissimilar joints between 1 700 MPa grade ultra-high strength steel and Q550D high strength steel
By using MAG fusion welding method and selecting appropriate high-strength steel welding wires,the optimal welding process parameters were obtained for dissimilar welding of 1 700 MPa grade UHSS(ultra-high strength steel)and Q550D high-strength steel plate.The microstructure and mechanical properties of the weld-ing head were tested.The results show that the microstructure of dissimilar welds is mainly composed of feathery lower bainite,and no martensite structure was found in the welded weld microstructure;On the side near the fu-sion line of 1 700 MPa grade ultra-high strength steel,a large amount of lath martensite was found growing verti-cally along the fusion line;Mechanical performance tests have shown that the performance of welded joints meets production and usage requirements,providing experimental basis for the application of ultra-high strength steel.
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