焊丝类型对A514/Q355ME异种钢焊接接头组织与性能的影响OA

This study focuses on dissimilar steel welded joints of A514/Q355ME,using flux-cored wire and solid wire for welding experiments.A systematic comparison was conducted on the micro structure and mechanical properties of the welded joints produced by the two types of welding wires.The results show that under the same welding process,there are significant differences in the morphological features and grain size of the joints welded with different wires.Crack resistance tests using oblique Y-groove butt weld crack test indicate that both joints exhibit comparable crack resistance,meeting the application requirements.The joint welded with flux-cored wire shows slightly higher yield strength and tensile strength compared to the solid wire joint,while their elongation is similar.In impact tests at-40℃,the impact energy at the weld of the solid wire joint reaches 172J,which is significantly higher than the 68J of the flux-cored wire joint.The fatigue limit of the solid wire joint reaches 390MPa,exceeding the 370MPa of the flux-cored wire joint.Overall,both types of joints meet engineering application requirements,and the appropriate welding material should be selected according to specific service conditions.