Solder & Brazing Rods
Silver Solder Paste | High-Strength Flux for Copper & Aluminum Welding | 30g/50g
TBS-02123WELD-00172
£7.99
Solder & Brazing Rods
1 product available
Selecting the proper silver solder and brazing alloys determines whether a pressurized line holds or fails under load. Compel supplies commercial trades and plant operations with production-grade brazing rods, filler wires, and fluxed sticks built for thermal systems and machine repairs. Our selection includes standard copper brazing rods for refrigeration circuits, high-strength silver brazing rods for vibration resistance, and multi-metal fillers for shop maintenance.
Whether you are stocking field service vans with a dedicated silver solder kit or outfitting plant fabrication cells, we supply exact alloy chemistries. Trade accounts receive consistent metallurgy, fast industrial dispatch, and clear technical documentation on every order.
Alloy Chemistry and Base Metal Matching
Matching the filler alloy to your parent metals prevents brittle joints and galvanic degradation. Phosphor copper and phosphorus-copper alloys containing silver, such as AWS Classification BCuP-5 or 15% silver alloy, are the industry benchmark for air conditioning and refrigeration brazing. The phosphorus content acts as a fluxing agent on pure copper joints, speeding up installation times.
For general plant maintenance involving dissimilar metals, brass alloys like HS221 join copper, iron, steel, and carbide tools. For aluminum bronze assemblies and demanding welding filler jobs, aluminum bronze ERCuAl rods provide specialized chemistry for TIG welding and brazing.
- Phosphor Copper: Standard choice for copper pipe and tube brazing without external flux.
- BCuP-5 and 15% Silver Alloy: Recommended for HVAC and refrigeration pipe repair where vibration resistance and tighter clearances matter.
- Brass (HS221): Suited for multi-metal repairs spanning copper, iron, steel, and carbide tool brazing.
- Aluminum Bronze (ERCuAl): Formulated for bronze tube brazing and welding filler duties.
Rod Profiles, Wire Formats, and Packaging
Physical format dictates feeding speed and joint penetration during torch or TIG operations. Flat profile rods sit securely inside pipe sockets and deliver more surface contact against tube shoulders, making them common for HVAC technicians brazing copper lines. Round rods and spooled wires provide even feeding for manual gas torch or automated filler setups.
Compel stocks straight rods in 250 mm, 254mm (10 in), and 40 cm / 50 cm lengths in packs of 20, 30, 40, or 50 pieces. Continuous brazing wire comes in 5 m coils and 10 m spools in diameters of 1.6 mm, 2.0 mm, 2.5 mm, and 3.0 mm for ongoing repair work.
Bare vs. Flux Coated Brazing Rods
Bare phosphor-copper filler requires no flux when joining clean copper-to-copper tubing. The metallurgical reaction between phosphorus and copper oxide cleans the surface during heating, simplifying work on overhead HVAC lines.
When joining copper to brass or running field repairs where surface conditions vary, flux coated brazing rods eliminate the step of applying separate paste. Flux coated sticks melt cleanly to shield the puddle from atmospheric contamination, ensuring sound bonding across mixed plumbing runs.
Buying guide
Choosing Solder & Brazing Rods
- When should I choose BCuP-5 or 15% silver brazing rods instead of standard phosphor copper?
- Phosphorus-copper alloy with 15% silver or BCuP-5 classification provides improved joint ductility and fills wider clearances better than basic phosphor copper. Technicians specify silver phosphor copper alloys for HVAC, refrigeration, and air conditioning lines that face continuous thermal cycling and mechanical vibration.
- Which brazing wire should I use for brazing steel, iron, or carbide tooling?
- Use a brass filler wire such as HS221. This material is compatible with copper, iron, steel, and carbide tools, making it the proper pick for tooling rebuilds and multi-metal shop repairs where phosphorus copper alloys cannot bond.
- Do flat phosphor copper rods require paste flux on copper pipe repairs?
- No. When joining copper pipe to copper fittings, straight phosphor copper and silver phosphor copper alloys do not require flux because the phosphorus self-fluxes the joint. However, you must use a separate flux or select flux coated brazing rods if you are joining copper to bronze or brass fittings.
- What working temperature is required for ERCuAl-A1 aluminum bronze filler wire?
- ERCuAl-A1 aluminum bronze filler requires an operating temperature of 1030-1040 °C. It is typically applied using a TIG welding or high-heat brazing process for bronze tube brazing and welding filler applications.
- What wire diameters and rod lengths are standard for industrial brazing?
- Continuous wire coils and spools come in diameters of 1.6 mm, 2.0 mm, 2.5 mm, and 3.0 mm in 5 m or 10 m packages. Straight brazing sticks are supplied in flat or round profiles with lengths of 250 mm, 254mm (10 in), or 40 cm / 50 cm.