Radial friction welding interface between brass and high carbon steel

CT-130 special inertia friction welding machine is used to finish a large size (156 mm diameter) of H90 brass/D60 steel dissimilar welding. SEM, EDS methods are used to analyze the interfacial characteristics of H90/D60 welding joint. The results show that in the welding interface, some furrow-shaped holes appear at the end of welding joint, and a smooth line occurs in the central welding interface and a good welding seam is formed. Thermoplastic brass is droved and flowed to the edge of welding interface under radial pressure, which becomes a lubricating thin film, and reduces the friction coefficient of welding joint edge, leads to that phenomenon. It is found that Fe and Cu elements diffusion appeared at the welding interface. But the density and distance of Fe element diffusion towards H90 brass are larger than that of Cu element towards D60 steel, which is attributed to the difference of the lattice coordination number of Fe/Cu.