Research on droplet transfer and wire arc additive manufacturing of 30CrMnSiA metal powder-cored welding wire

Abstract

In order to explore the feasibility of arc additive processing of metal powder-cored welding wire,30CrMnSiA high-strength steel powder-cored wire was adopted,combined with high-speed camera and electric signal synchronous acquisition system,to analyze the droplet transfer characteristics and arc stability of the wire under pulse melting and gas shielded welding process.Under certain process parameters,the influence of pulse process WAAM on formability,microstructure and mechanical properties of deposited parts of high-strength steel powder-cored wire was discussed.The experimental results show that the droplet transfer type of high-strength steel powder-cored welding wire is a short circuit transition with non-axial droplet and multiple pulses one drop;the transverse and longitudinal mechanical properties of the deposited part are different;both the strength and toughness along with transverse are better than that of longitudinal direction;there are a large number of dimples on the transverse and longitudinal fractures of the deposited parts,which suggest that the fracture modes are both micropore aggregation plastic fracture,and the size of dimples on the longitudinal fracture is significantly larger than that in the transverse fracture.Therefore,when the metal powder-cored wire is applied to the field of additive processing,its performance meets the application requirements,and the deposited parts with excellent microstructure and mechanical properties can be obtained.The research results provide reference for improving the additive processing efficiency and performance of the metal powder-cored wire.[HQ]

Keywords

• metallic materials; metal powder-cored welding wire; high strength steel; wire and arc additive manufacturing; droplet transfer; mechanical property