Brazing Ring & Preforms

A brazing ring is a pre-formed ring-shaped filler metal that allows for precise control of the amount used during welding, ensuring a uniform and consistent joint. As a typical brazing preform, it eliminates the need for cutting and weighing filler wire or sheets, making it more suitable for mass production and automation. With its stable filler metal distribution, brazing rings improve weld reliability, reduce material waste, and shorten process cycles, and are widely used in industries such as HVAC, automotive heat exchangers, electronics, and aerospace.

Chalco offers a variety of alloy systems and custom specifications to meet the high standards of applications in industries such as refrigeration and air conditioning, automotive heat exchangers, electronics and electrical engineering, and aerospace.

• Precise quantification: The brazing filler metal is consistent for each joint, resulting in a more stable weld.
• Easy to operate: eliminates the need for cutting and weighing, saving steps.
• Efficiency improvement: Suitable for mass production and automated production.
• Reliable quality: strong solder joints and low rework rate.
• Customization is supported: shape, size, and alloy can all be flexibly selected.

Chalco Brazing Ring - Available Alloy Grades

Different base materials and operating conditions require different alloy systems. Chalco offers a wide range of Brazing Rings and Forms, from silver-based, copper-based, and phosphor bronze to aluminum-silicon alloys, covering core industry applications such as HVAC, automotive, electronics and electrical, and aerospace.

• Silver-Based Brazing Rings

  Are made of silver-based alloys with excellent wettability and strength. They are suitable for copper, stainless steel and high-strength joints, and are the first choice for high-reliability welding and conductive components.

  Typical models: BAg-15 and BAg-28 rings, suitable for electrical and precision machinery due to strong flow and bonding.

• Copper Brazing Rings

  Are made of pure copper and have excellent electrical and thermal conductivity. Commonly used in electrical busbars, terminals, and brass components to ensure stable electrical performance.

  Typical forms: seamless and custom copper rings for high-current components and brass connectors in electrical systems.

• Phosphorus Copper Brazing Rings (Silfos)

  Enable self-soldering in copper-to-copper joints without flux and are widely used in HVAC copper tubing and refrigeration equipment. Cu-Ag-P alloy rings are also available for higher strength to meet harsh operating conditions.

  Typical models: BCuP-2 and BCuP-3 (also known as Sil-Fos 15), commonly used standard choices in the HVAC industry.

• Aluminum-Silicon Brazing Rings (4045/4047)

  Low-melting Al-Si rings offer excellent flow and are typically used with flux, suitable for lightweight, corrosion-resistant applications such as automotive heat exchangers, AC aluminum tubes, and electronic heat sinks.

  Typical models: 4045 and 4047 brazing rings, ideal for aluminum due to controlled melting point and corrosion resistance.

Chalco not only supplies a variety of standard alloy brazing rings, but also provides matching brazing wires , solder sheets, and filler rod of the same alloy. Custom compositions and specifications are supported, helping customers achieve complete brazing solutions from sample to mass production. Contact us for a quick quote and technical support.

Instant Quote

Chalco Brazing Ring Common Preform Types

In addition to standard ring products, brazed preforms can be manufactured in various shapes to meet the assembly requirements of various welding processes, depending on the application scenario. Chalco's Brazing Rings and Preforms enable more efficient and reliable connections in HVAC, automotive, electronics, and precision manufacturing.

Brazing Rings

Specifications: Outer diameter 2–50 mm, wire diameter 0.3–3 mm, tolerance ±0.02 mm; can be customized according to pipe diameter.

Features: Used for precise feeding in copper pipe and small-part welding, ideal for automation.

Brazing Washers & Discs

Specifications: Thickness 0.2–2 mm, diameter up to 80 mm, tolerance ±0.05 mm.

Features: Suitable for flat or large-area soldering, ensuring uniform distribution of solder, commonly used in electronic components and mechanical parts.

Brazing Shims & Spacers

Specifications: Thickness can be accurate to ±0.01 mm, typical size 5–50 mm.

Features: Combines gap control and quantitative feeding functions, widely used in precision assembly and high-requirement welding processes.

Brazing Lugs & Strips

Specifications: Welding pads: 5–30 mm and 0.5–2 mm thick; strips: 3–15 mm wide and 0.2–1 mm thick, available in rolls or custom lengths.

Features: Suitable for valve bodies, heat exchangers and long weld seams, can be quickly positioned and adapted to large-area or continuous welding scenarios.

Custom Preforms

Specifications: Can be manufactured according to customer drawings or designs, including those with holes, irregular shapes, or complex geometric structures.

Features: Meets the needs of automated equipment and special operating conditions, ensuring batch consistency and process compatibility.

From standard rings to gaskets, weld strips, and complex irregular parts, Chalco can provide high-precision preforms to ensure efficient and stable welding processes.

Instant Quote

Brazing Ring Flux Options

Flux plays a crucial role in the brazing process, removing oxide layers from metal surfaces and promoting solder wetting, thereby ensuring weld quality. To adapt to different working conditions, Chalco offers a variety of Brazing Ring flux solutions, including bare rings, coated rings, and cored rings.

• Bare Rings

  Bare rings are standard brazing rings without flux and require the use of a separate flux. They are suitable for mass production in factories and allow for flexible selection of different flux systems, such as fluoride-based fluxes for aluminum or borate/fluoroborate-based fluxes for copper.

• Flux-Coated Rings

  Flux-coated rings have a uniform coating of flux on the outer layer of the brazing ring, allowing the flux to melt simultaneously with the solder. This significantly simplifies the process, eliminates additional coating steps, and is particularly suitable for copper tubing in refrigeration, HVAC systems, and on-site repairs.

• Flux-Cored Rings

  Flux-cored rings are filled with flux powder, which is released along with the solder during welding to ensure clean weld seams. They are ideal for automated welding, space-constrained assembly, or applications requiring highly consistent production.

Whether you need a bare ring requiring external flux or an integrated flux-cored/coated brazed ring, Chalco can provide the right solution. We offer not only standard sizes but also customized flux formulations and coating thicknesses for different welding processes.

Instant Quote

Chalco Brazing Ring products collaborative application areas

HVAC & Refrigeration Industry: Phosphor bronze and flux-coated brazing rings are widely used in copper pipes, fittings, and air conditioning and refrigeration systems to ensure joint sealing and durability.

Automotive Heat Exchangers: Aluminum-silicon brazed rings (4045/4047) are ideal for automotive condensers, evaporators, and piping systems, offering a balance of lightweight design and corrosion resistance.

Electronics & Electrical: Silver-based and copper-based brazing rings are commonly used for welding busbars, contacts, and terminals to ensure conductivity and long-term stability.

Aerospace: High-silver-content brazing rings meet the high strength and reliability requirements of critical components and are used in structural parts and high-temperature connections.

Whether you're in the HVAC, automotive, electronics, or aerospace industry, Chalco can provide you with the right brazing rings and preform solutions.

Instant Quote

Brazing Ring Ordering & Supply Specifications

When selecting brazing rings and preforms, customers not only focus on alloys and shapes, but also have stringent requirements for dimensional accuracy, batch consistency, and standards compliance. Chalco's advanced manufacturing and testing capabilities ensure that every batch meets high standards for welding applications.

Machining accuracy: Outer diameter, wire diameter and thickness can be controlled within ±0.02–0.05 mm, ensuring precise matching of assembly and welding.

Material consistency: Strict control of alloy composition ensures stable performance between batches and consistent weld strength and fluidity.

Supply specifications: Standard stock sizes are available (such as BCuP-2, BCuP-3, BAg-15, BAg-28 and other commonly used grades), and special specifications can also be processed according to customer drawings.

Pressure rating: Some brazed rings are suitable for refrigeration and high-pressure systems, capable of withstanding pressure requirements up to 400 lb, meeting the needs of HVAC and industrial piping.

Supply method: Supports small batch samples (such as 10 pieces/box packaging) to large-scale industrial continuous production, facilitating flexible procurement for customers.

Customization capabilities: Supports customization of alloy composition (silver content, phosphorus content, Al-Si ratio), as well as personalized customization of Flux coating thickness and type.

Standards Compliance: Products comply with international standards such as AWS A5.8, ISO 17672, and GB/T 9460, and UL and RoHS compliance certifications can be provided upon request, along with complete material certificates and test reports.

Whether for R&D prototyping or large-scale supply, Chalco provides customers with high-precision, traceable Brazing Rings and Forms. Contact us for a customized quote and technical support.

Instant Quote

As a comprehensive brazing consumables supplier, Chalco also offers matching brazing rods, wires, foils, strips, and customized filler products, which you can explore in the selection below.

Aluminum Brazing Rod

Flux-core Aluminum Brazing Rod

Aluminum Stick Welding Rod

Silver Brazing Solder Rod

Copper Brazing Rod

Copper to Copper Brazing Rod

Brazing Rings vs Brazing Wire: How to Choose the Right Brazing Material?

Brazing rings and brazing wires are essentially made of the same alloy material; the main differences lie in their shape and application.

Brazing Rings: Pre-formed into rings or sheets, they enable quantitative feeding during welding, ensuring uniform welds. They are particularly suitable for HVAC copper tubing, automotive heat exchangers, and mass automated production.

Brazing Wire Rod: Supplied in straight or coiled form, it is flexible in operation, can be cut and manually fed at any time, and is suitable for repair welding, non-standard parts and small batch processing.

In contrast, Brazing Rings prioritizes efficiency and consistency, while Brazing Wire emphasizes flexibility and versatility.

Chalco supplies both rings and wires, allowing customers to choose flexibly based on specific working conditions.

Instant Quote

Brazing Ring Frequently Asked Questions (FAQ)

Q1: Do all brazing rings require flux?

A: Not all. Phosphor bronze rings (Silfos series) can be self-soldered in copper-to-copper joints without additional flux; while silver-based and aluminum-based brazing rings usually require the use of a special flux.

Q2: What is the difference between Brazing Rings and Brazing Preforms?

A: Brazing Rings are a type of preform, specifically referring to ring-shaped solder; while Preforms also include gaskets, spacers, solder strips, solder ribbons, and custom-shaped parts.

Q3: Can flux-free brazing rings be used on HVAC copper tubing?

A: Yes. Phosphor bronze brazing rings (Silfos) are specifically designed for copper-to-copper joints, ideal for rapid assembly welding of copper tubing in HVAC systems, and are widely used in the refrigeration industry.

Q4: Does the company support small-batch customization?

A: Yes. Chalco can provide sample making and small packaging (10 pieces/box), and can quickly switch to large-scale continuous production to meet the needs of the entire process from R&D to mass production.

Q5: What is the difference between Brazing Rings and Brazing Wire/Strip?

A: Brazing rings are pre-formed parts with precise quantity and are suitable for automated production; while wires or strips are more flexible and suitable for repair, non-standard joints, or manual operation.

Q6: How should I choose between Flux-Coated and Flux-Cored Rings?

A: Flux-Coated rings have flux covering the surface, making them suitable for field repairs and refrigeration systems; Flux-Cored rings release flux simultaneously with the solder, making them more suitable for automated mass production.