Effect of Welding Technology on Microstructure and Mechanical Properties of 10CrNiCu Steel Flux-cored Wire Deposited Metal

In the cause of welding, the welding parameters have an impact effect on the microstructure and mechanical properties of deposited metal. To design suitable welding procedure, the effects of interpass temperature and welding heat input on the microstructures and mechanical properties of deposited metals of 10CrNiCu steel flux-cored wires are systematically studied. The microstructures of the deposited metals are characterized by optical microscopy and transmission electron microscopy, and the mechanical properties of the deposited metals are evaluated by tensile and impact testing machines. Results show that the effects of interpass temperature on microstructures and mechanical properties of deposited metals are not obvious. With the increase of welding heat input, the tensile and yield strengths of the deposited metals decrease slowly, and the impact energy absorbed increases slightly first and then decreases obviously. When the 10CrNiCu steel flux-cored wire is used, the interpass temperature should be controlled in the range of 90-160 ℃,and the heat input in the range of 12-14 kJ/cm. Under the above welding conditions, the welded joint can have good match of strength and toughness.