COPPER-PHOSPHORUS BRAZING ALLOY

Copper-phosphorus (Cu-P) brazing alloys are low-melting point filler metals primarily used for joining copper and copper alloys. They're mainly made of copper and phosphorus; some alloys might also contain silver (Ag). These alloys are widely chosen in industry because of their excellent capillary penetration and self-fluxing properties.

Key Properties

Self-Fluxing Capability: Phosphorus dissolves oxides on copper and copper alloys, eliminating the need for a separate brazing flux. This simplifies processes and reduces costs. However, this property doesn't apply to ferrous metals like steel or nickel; you'll need an external flux when brazing with those materials.

Low Melting Point: Having lower melting points than copper allows brazing at lower temperatures. This helps preserve the base material's properties and cuts down on energy use.

High Fluidity: The molten alloy easily flows into gaps between parts, creating strong, leak-tight joints.

Economical: They are generally more cost-effective than silver-containing brazing alloys.

Areas of Use

Cu-P brazing alloys are commonly used where copper pipes and fittings are involved, such as in:

HVAC (Heating, Ventilation, and Air Conditioning) systems

Pipelines

Electric motors and transformers
 

These alloys offer an ideal solution for long-lasting applications by forming high-strength and corrosion-resistant joints.