Study on the microstructure and properties of the SMAW weld joints of Q460E construction steel

By shield metal arc welding method, and the equal matching strength and low matching strength electrodes were used respectively to weld the high-rise building steel Q460 E plates with 40 mm in thickness. The microstructure of weld joints were observed by metallographic microscope, and the mechanical properties of weld joints were tested by universal material testing machine and pendulum impact testing machine. Results show that the welded joint of uniform microstructures and good comprehensive mechanical properties can be get with both equal matching and under matching electrodes to match the Q460 E steel welding, the equal matching weld joint has a higher tensile strength and better impact performance at-40 ℃.