Development and Application of Flux Cored Wire for Wire-Arc Additive Manufacturing of 460 MPa Grade Building Ten-Directional Steel Point

Based on the nominal chemical composition of Q460 steel, the composition of a special flux cored wire was designed for the wire-arc additive manufacturing of building ten-directional steel point. The flux cored wire was prepared and its process performance was studied. The building ten-directional steel point was fabricated by the wire-arc additive manufacturing technique with this flux cored wire, and the dimensional accuracy, microstructure and mechanical properties were studied. The results show that the flux cored wire prepared by the experiments had stable arc and small spatter during the wire-arc additive manufactuning. No cracks, pores and other defects were formed in the depositing metal. The forming accuracy of the ten-directional building steel point by the wire-arc additive manufacturing with the flux cored wire met the requirements. The microstructure consisted of fine ferrite and little pearlite. The tensile properties and impact performance at room temperature and -40℃ met the mechanical property requirements of the traditional building ten-directional steel point of Q460 steel.