Brass brazing alloys are medium to high-temperature filler metals primarily composed of copper (Cu) and zinc (Zn), used for joining various metals (especially steel, cast iron, nickel, copper, and brass alloys). These alloys are widely used due to their relatively cost-effectiveness, good fluidity, and compatibility with a range of base metals.
Key Properties
Main Components: Copper and zinc are the most fundamental elements. The zinc content influences the alloy's melting point and fluidity; higher zinc generally leads to a lower melting point and better fluidity.
Melting Point Range: Brass brazing alloys typically melt in the 800°C - 1000°C (1472°F - 1832°F) range, making them suitable for high-temperature brazing applications.
Good Fluidity and Wetting: When the correct brazing flux is used, the molten brass alloy spreads well over the surfaces to be joined and penetrates joint gaps via capillary action, forming strong and leak-tight bonds.
Compatibility with Various Base Metals: They can be used for brazing many different metals, including steel, stainless steel, cast iron, nickel alloys, copper, and brass itself.
Cost-Effectiveness: They offer a more economical option compared to silver or nickel-based alloys.
Flux Requirement: Brass brazing alloys typically require a special brazing flux, often borax-based or fluoride-containing. These fluxes clean oxides that can form on metal surfaces during brazing, ensuring the alloy properly adheres to the base metal.
Areas of Use
Brass brazing alloys are widely employed in numerous industrial and commercial applications that demand durable and cost-effective joints. Primary areas of use include:
Automotive Industry: Exhaust systems, hydraulic lines, and various metal fittings.
Bicycle and Motorcycle Frames: For strong and lightweight joints.
Furniture and Decorative Products: Joining metal frameworks.
Piping Systems: Especially for joining steel or cast iron pipelines.
Heavy Industry Equipment: Repairing and joining various machine parts.
Electrical Conductors: Joining copper or other conductive metals.
Brass brazing alloys provide a versatile solution for creating robust, reliable, and economical brazed joints.
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ISO
17672
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EN
1044
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Cu %
|
Zn %
|
Si %
|
Ni %
|
Mn %
|
Others
|
Melting Range
ºC
|
|
-
|
PB 301
|
60
|
38,5
|
0,3
|
-
|
-
|
0,2 Sn
|
875-895
|
|
-
|
PB 305
|
49
|
41,3
|
0,2
|
9,5
|
-
|
-
|
890-920
|
|
-
|
PB 306
|
60
|
38,3
|
0,2
|
-
|
0,8
|
0,4 Sn
|
870-890
|
|
-
|
PB 305
|
59,5
|
38,1
|
0,3
|
0,4
|
0,3
|
0,8 Sn - 0,2 Fe
|
870-890
|