Brazed aluminium 4004 4047 4347 6063 6951

Hard brazed aluminium base filler metal and aluminium alloy brazing plate. When brazing, the brazed material does not melt, and the brazing filler metal melts to fill the joints and connect the workpieces. Aluminum-based solder can be coated on aluminium alloy core material to make aluminium alloy brazing plate, which is widely used in the manufacture of heat exchangers.


 
Aluminum-based solder Al-Si alloy has low melting point and good fluidity, which is suitable for soldering. Typical aluminium-based solders are 4347, 4047 and 4004 alloys.
 
6951 (American Brand) alloys of industrial pure aluminium, aluminium-manganese alloys and aluminium-magnesium-silicon alloys have good brazing performance, and they can be brazed with the above-mentioned aluminium-based solders. 6061, 6053 and 6063 alloys in Al-Mg-Si system also have better brazing performance, but because their starting melting temperature is lower than that of pure Al and Al-Mn alloys in industry, brazing temperature should be strictly controlled to prevent overheating. 4004 filler metal contains magnesium, which is suitable for vacuum brazing. In the brazing process, magnesium vapor reacts with residual oxygen and water in the furnace to purify, and magnesium vapor also inhibits the re-oxidation of brazed aluminium alloy.