The aluminum brazing material consists of a thin layer of aluminum-silicon alloy wrapped on one or both sides of the core alloy (AA3003)
Release time:
2022-12-13
【Summary Description】 The aluminum brazing material consists of a thin layer of aluminum-silicon alloy coated on one or both sides of the core alloy (AA3003). The low-melting aluminum-silicon alloy melts and flows during the brazing process, and after cooling, a metallurgical bond is formed between the parts to be joined. Core alloy: NOCOLOK brazing requires the solidus temperature of the base metal not lower than 615 ℃. At the same time, because the flux has certain restrictions on the dissolution of MgO on the surface of the alloy, Mg and MgO react with the flux to form MgF2, the melting point of the flux increases, and the flux loses activity, so the content of Mg should not exceed 1% (preferably 0.5). Thus, aluminum alloys suitable for NOCOLOK brazing include commercially pure aluminum and Al-Mn alloys with low Mg content (e. g., AA3003, AA3102, AA3005, AA3105, etc.). And aluminum magnesium silicon alloy (such as AA6063, AA6951, etc.). AA3003 is a conventional alloy that can be considered for automotive heat exchangers. It can be used for all brazing methods. Note: Most aluminum alloys can be brazed, but all brazing techniques cannot be used. There are mainly protective atmosphere brazing (CAB), commonly known as NB brazing, vacuum brazing (VB). For air furnace brazing, the choice of alloy may be the same as for CAB. AA3003 is a conventional alloy that can be considered for automotive heat exchangers. It can be used for all brazing methods. In order to obtain higher strength, AA3005 alloy is used for vacuum brazing, and age-strengthened alloys AA6060, AA6063 and AA6951 can also be used for vacuum brazing. In order to make it possible to age strengthen the 6000 series alloys, the cooling rate after brazing must be very fast. In order to achieve the highest strength after aging, the cooling rate must be> 1°C/SCE in the temperature range of 400°C to 200°C. 500 series alloys can also be used for VB brazing. It is difficult to solder these alloys with flux. When the magnesium content in the alloy is high, the flux cannot remove the oxide. For NB(CAB) brazing, the Mg content is objectively limited to about 0.4%. The same is true of other magnesium-containing alloys such as the 6000 series. 1000, 2000 and 7000 series alloys are rarely used for brazing. The 000 series and the other two low alloy composition series have lower post-weld strength. When the alloy composition is high, its brazing melting point is low, failing to provide good brazing.
The aluminum brazing material consists of a thin layer of aluminum-silicon alloy coated on one or both sides of the core alloy (AA3003). The low-melting aluminum-silicon alloy melts and flows during the brazing process, and after cooling, a metallurgical bond is formed between the parts to be joined.
Core alloy: NOCOLOK brazing requires the solidus temperature of the base metal not lower than 615 ℃. At the same time, because the flux has certain restrictions on the dissolution of MgO on the surface of the alloy, Mg and MgO react with the flux to form MgF2, the melting point of the flux increases, and the flux loses activity, so the content of Mg should not exceed 1% (preferably 0.5). Thus, aluminum alloys suitable for NOCOLOK brazing include commercially pure aluminum and Al-Mn alloys with low Mg content (e. g., AA3003, AA3102, AA3005, AA3105, etc.). And aluminum magnesium silicon alloy (such as AA6063, AA6951, etc.). AA3003 is a conventional alloy that can be considered for automotive heat exchangers. It can be used for all brazing methods.
Note: Most aluminum alloys can be brazed, but all brazing techniques cannot be used. There are mainly protective atmosphere brazing (CAB), commonly known as NB brazing, vacuum brazing (VB). For air furnace brazing, the choice of alloy may be the same as for CAB.
AA3003 is a conventional alloy that can be considered for automotive heat exchangers. It can be used for all brazing methods. In order to obtain higher strength, AA3005 alloy is used for vacuum brazing, and age-strengthened alloys AA6060, AA6063 and AA6951 can also be used for vacuum brazing. In order to make it possible to age strengthen the 6000 series alloys, the cooling rate after brazing must be very fast. In order to achieve the highest strength after aging, the cooling rate must be> 1°C/SCE in the temperature range of 400°C to 200°C.
500 series alloys can also be used for VB brazing. It is difficult to solder these alloys with flux. When the magnesium content in the alloy is high, the flux cannot remove the oxide. For NB(CAB) brazing, the Mg content is objectively limited to about 0.4%. The same is true of other magnesium-containing alloys such as the 6000 series.
1000, 2000 and 7000 series alloys are rarely used for brazing. The 000 series and the other two low alloy composition series have lower post-weld strength. When the alloy composition is high, its brazing melting point is low, failing to provide good brazing.
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