BCu93P Flat Copper-Phosphorus Brazing Rod (Silver-Free)

Product Name:BCu93P Flat Phosphor Copper Brazing Rod / Silver-Free Copper-Phosphorus Filler Metal
Model: BCu93P (HL201 / AWS BCuP-2)
Size:Flat Bar 1.3 × 3.2 × 400 mm

Product Overview

BCu93P is a silver-free, copper-phosphorus binary brazing filler metal with approximately 7% phosphorus and copper as the balance. The phosphorus content acts as a self-fluxing agent, enabling the rod to wet copper base metal and form sound joints without additional flux when brazing pure copper. The flat-bar configuration increases the heat-absorbing surface area for faster melting and higher brazing efficiency. It is particularly suited for flame brazing of copper-to-copper joints in air-conditioning, refrigeration, and plumbing systems.

Technical Specifications

Key Features

① Self-Fluxing for Pure Copper — No Extra Flux Required
The phosphorus content provides self-fluxing action during brazing. When joining pure copper, no additional flux is needed, simplifying operation and eliminating flux residue concerns in piping systems.

② Flat-Bar Design — Faster Melting, Higher Efficiency
The flat cross-section offers greater heat-absorbing surface area compared to round wire, enabling faster attainment of melting temperature during flame brazing and reducing heating time.

③ Excellent Fluidity — Superior Gap-Filling Capacity
The filler metal flows readily into tight joints, forming dense, leak-free brazed connections. Optimal capillary flow is achieved with joint clearances of 0.025–0.075 mm.

④ Sound Joint Properties — Good Conductivity
Brazed joints exhibit electrical and thermal conductivity close to that of the copper base metal, suitable for piping systems requiring reliable electrical and thermal performance.

⑤ Cost-Effective — Silver-Free Formulation
As a silver-free filler metal, it offers significant material cost savings compared to silver-bearing copper-phosphorus alloys while meeting performance requirements for copper-to-copper joints.

Applications

Air-Conditioning & Refrigeration:Copper tube connections in AC units, refrigerators, evaporators, condensers, and heat exchangers.

Plumbing & Water Systems:Installation and repair of copper piping, copper tube and fitting brazing.

Motors & Electrical Equipment: Copper busbars, copper conductors, transformer copper components.

Heat Exchange Equipment:Water heaters, heat exchangers, and related copper piping systems.

Important Notes

⚠ Flux Required for Brass Brazing
The self-fluxing property applies to pure copper only. When brazing brass or copper-to-brass joints, silver brazing flux must be used to ensure proper wetting and joint formation.

⚠ Not for Impact or Vibration Loads
The filler metal has relatively low ductility. Joints should not be subjected to impact or continuous vibration. For such applications, silver-bearing copper-phosphorus filler metals are recommended.

⚠ Avoid Sulfur-Containing Environments
Phosphorus-copper filler metals degrade when exposed to sulfur or sulfur compounds, particularly at elevated temperatures. Not suitable for service in such environments.

⚠ Not for Iron, Nickel, or Nickel-Based Alloys
Phosphorus forms brittle phosphides with iron and nickel, embrittling the joint. Use with steel or nickel-based alloys is strictly prohibited.

Brazing Recommendations:Flame brazing and high-frequency induction brazing are recommended. Maintain joint clearance of 0.025–0.075 mm for optimal capillary flow. Heat rapidly through the melting range to avoid segregation.