2006 Volume 47 Issue 3 Pages 874-882
5052 aluminum alloy plate used for substrate and 2017 aluminum alloy bar used for coating rod, both monolayer and multilayer friction surfacing were done using a numerical controlled full automatic friction welding machine. Effects of the surfacing conditions on structure and mechanical properties of both monolayer and multilayer deposits were investigated. It was clearly observed that the circular pattern appeared on the surface of both monolayer and multilayer deposits by the rotation of coating rod, and the interval of circularly pattern become narrower with increasing of the rotation of coating rod. The monolayer deposit has a tendency to incline toward right side (Retreating side) further than center of deposit for the feed direction of coating rod. And, the 2nd surfacing of multilayer deposit recognized to incline toward the 1st deposit side. A little of incomplete welds was observed at both sides of monolayer deposit. The incomplete parts of welds 1st deposit in multilayer deposit were disappeared by 2nd surfacing. Microstructures of both monolayer and multilayer deposits were finer than those of the substrate and coating rod. The deposition efficiency of 2nd surfacing in multilayer deposit showed higher value than that of the monolayer deposit. Hardness of both deposits showed higher value than that of the substrate and same value of coating rod. The softened area was recognized at 2.5 mm distance from the weld interface of substrate and coating rod. The tensile strength of multilayer deposit showed higher value than that of the monolayer deposit, and both deposits showed higher value than that of the substrate.
