Abstract
Pure copper to pure aluminum were friction welded using a N/C controlled brake type friction welding machine. The intermetallic compound was analyzed with X-ray diffraction system after welded joint breaks compulsory at weld interface. A stratified compound layer was observed at the weld interface. In case of before heat treatment, a θ phase(CuAl_2) was observed on the aluminum side, and both θ phase and γ_2 phase(Cu_9Al_4) were recognized on the cupper side. The hardness of θ phase and γ_2 showed HK536 and HK736, respectively. The thickness of compound layer became thicker with increasing of heating time. The tensile strength of welded joint showed same value to that of the aluminum base metal before heat treatment and decreased with increasing of heating time. The minimum tensile strength of welded joint was obtained at heating temperature of 808K and heating time of 300min and was 25% to that of welded joint before heat treatment. The impact value of welded joint increased with increasing heating time.
