The purpose of this study is to investigate the influence of oxygen on the weldability of the joints between aluminum bronze and austenitic stainless steel. Bondings were performed using Cu foils with different oxygen content. Different aluminum bronzes with various aluminum content were also used.
The tensile strength of joints decreased rapidly as the oxygen content in Cu foils increased. The joint efficiency decreased as the aluminum content in aluminum bronez increased. When the oxygen content was low up to 28 ppm, the aluminum content in aluminum bronze did not affect its strength. The segregation of aluminum and oxygen on the surface of the aluminum bronze was recognized by AUGER analysis. From the results of this analysis, aluminum oxides are considered to be formed on the surface of the aluminum bronze.
The weldability of the joints lowed when the higher oxygen content Cu foils were used, but the tensile strength of the joints increased when the surface of the aluminum bronze before bonding was sputtered by Ar-ions first and then coated by Cu.
