25 mm thick 27 SiMn high strength steels are welded with the fiber laser-metal active gas(MAG)hybrid welding method,and the microstructures and mechanical properties of the welding joints are analyzed.The results show that the weld seam and heat affected zone of the root-face pass of the joints are mainly composed of martensite.The weld seam of the filler pass mainly consists of intragranular acicular ferrite,a small amount of pre-eutectoid ferrite and upper bainite,and the microstructure of the heat affect...
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