Copper-phosphorus brazing alloys
Filler metals commonly considered for compatible copper-to-copper and selected copper-alloy joints.
View copper brazing alloys →Product overview
Brazing alloys selected for the metals and joint
S.K. Metal supplies brazing alloys for buyers who need filler metal matched to the base metals, joint design, service conditions and approved brazing procedure.
The filler metal must melt below the solidus temperature of the components being joined and flow through a properly designed joint. Selection involves composition, solidus and liquidus temperatures, joint clearance, flux or atmosphere, heating method, required strength, corrosion conditions and any restrictions on alloying elements.
See what to include in your brazing alloy enquiry
Alloy families and forms
Choose brazing alloys for the joint requirement
Start with the base metals and service conditions, then confirm composition, melting range, form and dimensions.
Silver brazing alloys
Silver-bearing filler metals for compatible ferrous and non-ferrous base-metal combinations.
View silver brazing alloys →Cadmium-free silver alloys
Cadmium-free options for projects that restrict cadmium and specify an approved silver-alloy classification.
Request composition details →Brazing rods and wire
Straight rods, wire or coil forms selected to suit manual, automated and production brazing methods.
Request available sizes →Brazing rings and preforms
Measured filler-metal forms for repeat joints when geometry, alloy and quantity are clearly specified.
Discuss preform requirements →Flux-compatible filler metals
Alloys selected together with the approved flux or controlled atmosphere required by the joining procedure.
Send your brazing procedure →Specification guide
How to specify brazing filler metals
A complete specification helps avoid choosing an incompatible alloy, melting range, flux or physical form.
- Base metals
- Identify every material being joined, including grade, coating or plating where applicable.
- Alloy classification
- Provide the required filler-metal designation, composition or governing standard.
- Melting range
- Confirm solidus, liquidus and recommended brazing-temperature range against the approved procedure.
- Product form
- State rod, wire, strip, ring, preform, powder or paste and include all required dimensions.
- Flux or atmosphere
- Specify the approved flux, shielding atmosphere or furnace conditions used by the process.
- Service conditions
- State joint loading, operating temperature, corrosion exposure, pressure-tightness and regulatory requirements.
- Quantity & delivery
- Provide weight or piece quantity, packaging, delivery city, required date and documentation needs.
Important: A filler metal must not be selected only by silver percentage or product appearance. The responsible welding or brazing professional should approve the alloy, joint design, preparation, flux, heating cycle and safety controls.
Applications
Applications of brazing alloys
The correct filler metal depends on the base metals, joint design, heating method and operating conditions.
HVAC and refrigeration
Brazed copper tube, fittings, coils and compatible refrigerant-line components.
Plumbing and piping
Compatible copper and copper-alloy joints produced under an approved installation procedure.
Heat exchangers
Tube, return-bend and header assemblies requiring repeatable, pressure-tight brazed joints.
Industrial fabrication
Joining compatible steels, copper alloys and mixed-metal assemblies with a selected filler metal.
Electrical assemblies
Conductive joints and components where alloy selection accounts for electrical and thermal service.
Medical gas projects
Only project-approved filler metals, procedures, cleanliness controls and qualified personnel should be used.
Quality and documentation
Verify brazing alloy classification and documents
Ask for documentation applicable to the exact composition and product form being quoted. Welding professionals can review the AWS filler-metal standards information when identifying the governing classification.
Discuss your material requirement →- Filler-metal classification and composition confirmation
- Rod, wire, ring or preform dimensional verification
- Solidus, liquidus and brazing-range documentation
- Lot identification and certificates when included in the quotation
- Packaging, storage and safety-information requirements
Ordering checklist
How to order brazing alloys
Send the approved filler-metal specification or brazing procedure when several alloys, forms or sizes are required.
Identify the base metals
State the grades, coatings and thicknesses of every component being joined.
Specify the filler metal
Provide composition, classification, silver content where relevant and applicable standard.
Choose form and dimensions
List rod diameter and length, wire size, ring dimensions or other required physical form.
Describe the process
State heating method, flux or atmosphere, joint clearance, service conditions and qualification requirements.
Confirm quantity and delivery
Include weight or piece quantity, packaging, delivery location, schedule and documentation requirements.
Frequently asked questions
Brazing alloys FAQs
What information is needed for a brazing alloy quotation?
Provide base metals, filler-metal classification or composition, form, dimensions, quantity, joining process, delivery location and documentation requirements.
What is the difference between brazing and soldering?
Brazing uses a filler metal with a liquidus above 450°C while the base metals remain solid. Soldering uses filler metals with a lower liquidus temperature.
When are copper-phosphorus alloys used?
They are commonly considered for compatible copper-to-copper joints and selected copper-alloy combinations. Flux requirements and suitability vary with the base metals and filler composition.
Why are silver brazing alloys used?
Silver-bearing alloys can provide useful flow and joining characteristics across compatible ferrous and non-ferrous metals. Selection must consider composition, melting range, joint service and element restrictions.
Is flux always required?
No single rule applies. Flux or a controlled atmosphere depends on the filler metal, base metals, heating method and approved process. Follow the applicable procedure and supplier instructions.
Are certificates available?
Document availability depends on the alloy, brand and order. State the exact certificate, lot traceability or inspection requirement before quotation.
Request a quotation
Send your brazing filler-metal schedule
Include base metals, alloy classification, product form, dimensions, quantity and delivery location. S.K. Metal will review availability and the applicable commercial and technical details.
Send your requirement