What is the correct technique for brazing with the Harris Quicksilver Phos-Copper Brazing Alloy - 0.050 x 1/8 in (1.3 x 3.2 mm) - 1 ea Tube - QS620F1?

Proper joint preparation is critical for sound brazed joints: clean all joint surfaces to remove oil, oxide, and scale using emery cloth or a wire brush. Maintain proper joint clearance for capillary flow. Heat the base metal — not the filler rod — to brazing temperature before touching the rod to the joint. The heat-to-flow sequence ensures proper capillary action. Allow the joint to air cool before quenching to avoid thermal shock cracking.

Harris Quicksilver Phos-Copper Brazing Alloy - 0.050 x 1/8 in (1.3 x 3.2 mm) - 1 ea Tube - QS620F1

Q: What is the Harris Quicksilver Phos-Copper Brazing Alloy - 0.050 x 1/8 in (1.3 x 3.2 mm) - 1 ea Tube - QS620F1 used for?

The Harris Quicksilver Phos-Copper Brazing Alloy - 0.050 x 1/8 in (1.3 x 3.2 mm) - 1 ea Tube - QS620F1 is a phosphor-copper brazing alloy (BCuP-2). Phos-copper alloys are self-fluxing on copper and copper alloys — no separate flux is required when brazing copper to copper. However, flux IS required when brazing copper to brass, bronze, or steel. These alloys are widely used in HVAC/R applications for copper tubing joints.

Q: What diameter is the Harris Quicksilver Phos-Copper Brazing Alloy - 0.050 x 1/8 in (1.3 x 3.2 mm) - 1 ea Tube - QS620F1 available in?

The Harris Quicksilver Phos-Copper Brazing Alloy - 0.050 x 1/8 in (1.3 x 3.2 mm) - 1 ea Tube - QS620F1 is available in .052, 1/8 diameter. Rod or wire diameter selection depends on joint gap clearance and feeding method: narrow-gap joints with tight clearances benefit from thinner rod (easier to feed into the joint), while larger-gap joints require more filler and may work better with thicker rod. Pre-placed rings or preforms are available for production brazing of consistent joint geometries.

Q: Does the Harris Quicksilver Phos-Copper Brazing Alloy - 0.050 x 1/8 in (1.3 x 3.2 mm) - 1 ea Tube - QS620F1 require brazing flux?

When brazing copper to copper with phos-copper alloy, the phosphorus content acts as a deoxidizer and eliminates the need for separate flux. When joining copper to dissimilar metals (brass, bronze, steel), a compatible brazing flux (such as Harris Stay-Silv White Flux) must be applied to all surfaces that the alloy will contact.

Q: What package size is the Harris Quicksilver Phos-Copper Brazing Alloy - 0.050 x 1/8 in (1.3 x 3.2 mm) - 1 ea Tube - QS620F1 available in, and how should I store it?

Brazing alloys are sold in various rod lengths and weights — common sizes include 1 lb, 5 lb, and 25 lb packages. Store in a dry location free from oil and solvent contamination. Silver brazing alloys are stable at room temperature and do not require special controlled-atmosphere storage. Keep surfaces clean to ensure proper flux adhesion and capillary flow.

SKU: QS620F1

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Quicksilver™ phos-copper brazing alloy 0.050 x 1/8 x 20 in. x 1 ea. 28-stick tube

Overview

Quicksilver is an economical brazing filler metal primarily used to braze copper-to-copper. It can also be used to braze copper-to-brass. It is self-fluxing on copper, but requires the use of Safety-Silv White (or Black) Brazing Flux when brazing brass. Quicksilver™ is fluid at liquidus temperature with recommended joint clearance below 0.005 in. Complies with the EU Reach & RoHS directive.

Features

Economical alloy for brazing copper-to-copper and copper-to-brass
Self-fluxing on copper
Fluid at brazing temperature
Brazing range of 1350◦F - 1500◦F (704°C - 816°C)
Recommended joint clearances below 0.005 in. (0.13 mm)
Use Stay-Silv white flux to braze brass or copper-to-brass
Corrosion resistance is generally similar to the copper base metal, but phosphorus containing alloys, including Quicksilver, should not be used if the braze is exposed to sulfur or sulfur compounds in service
Not recommended for brazing steel or other ferrous base metals
Complies with the EU Reach & RoHS directive

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Q&A

Product Overview

Features

Economical alloy for brazing copper-to-copper and copper-to-brass
Self-fluxing on copper
Fluid at brazing temperature
Brazing range of 1350◦F - 1500◦F (704°C - 816°C)
Recommended joint clearances below 0.005 in. (0.13 mm)
Use Stay-Silv white flux to braze brass or copper-to-brass
Corrosion resistance is generally similar to the copper base metal, but phosphorus containing alloys, including Quicksilver, should not be used if the braze is exposed to sulfur or sulfur compounds in service
Not recommended for brazing steel or other ferrous base metals
Complies with the EU Reach & RoHS directive

Harris Quicksilver Phos-Copper Brazing Alloy - 0.050 x 1/8 in (1.3 x 3.2 mm) - 1 ea Tube - QS620F1

Product Overview

Features

Product Reviews

Questions & Answers