Welding Improvement of Q345E-Z25 Steel for Door Frame of Wind Power Tower Barrel

This paper starts from the chemical composition and mechanical properties of Q345E-Z25, a door frame of wind power tower barrel, and selects ER50-6 solid wire and E501T-1 flux-cored wire as experimental objects specifically. The paper focuses on the mechanical properties and impact resistance at low temperatures of the weld seam and weld heat-affected zone of both wires. The results indicate that the mechanical properties and low-temperature impact toughness of the weld metal and heat-affected zone produced with flux-cored wire E501T-1 are basically consistent with those of the base metal, verifying the feasibility of using E501T-1 as a welding material for wind turbine door frames. Moreover, compared with other welding wires, E501T-1 offers lower cost, making it have great promotion value and economic benefits.