Microstructural Evaluation of Copper Brazed Joints Using Silver-Based Filler Metal

The oxy-acetylene torch brazing of copper tubes using silver-based filler metals (Ag-Cu-Zn-Cd) was investigated in this study. Filler containing silver content 15% and 35%, designated by BR15 BR35, were used to assess the influence microstructure mechanical performance brazed joints. joints analyzed means optical microscopy, scanning electron energy-dispersive spectroscopy. microstructures BR35 samples composed mainly Ag–Cd-rich phase, solid solution Cu–Zn, a eutectic structure Ag Cu. increase changed solidification mode from cellular dendritic caused an phase volume fraction. tensile strength Ag–Cu–Zn–Cd phos–copper compared. metal slightly higher than