Study on Brazability of Low-melting-point Ag-Al-Mn-Si Brazing Filler

Low-melting-point Ag-Al-Mn-Si brazing filler were produced. Refer to concerned standards and test procedures, spreadability and clearance fillabitity for the filler metal on brazed titanium alloy to stainless steel, and mechanical properties of brazed joints have been tested. Test results indicated that linear temperature for liquid phase was under 850℃, the spreadable area was 22.5cm² on titanium alloy and 13.2cm² on stainless steel, the slow-flow length was bigger than 80mm, the tensile intension of joints was 242MPa and shear intension 154MPa, and rupture place was in intermetallics layers next to stainless steel. The micro-examination of brazed joints showed that Al in brazing filler would prevent dissolution and diffusion of Ti; Mn, Si in brazing filler would induce crackle formation next to stainless steel. Titanium alloy and stainless steel can be brazed using Ag-10Al-1Mn-0.5 Si brazing filler.