How is dip brazing done?

Aluminum dip brazing involves placing the preheated parts into a molten salt bath. The salts act as a flux as the filler metal, now heated to the point of liquifying, works its way through the joint. For many dip brazes, the dip process is completed by hand.

Is it better to braze or weld aluminum?

The first big difference is in temperature – brazing does not melt the base metals. This means that brazing temperatures are invariably lower than the melting points of the base metals. Brazing temperatures are also significantly lower than welding temperatures for the same base metals, using less energy.

Do you have to use flux when brazing aluminum?

Aluminum braze flux is required in all aluminum brazing operations. Aluminum brazing fluxes consist of various combinations of fluorides and chlorides and are supplied as a dry powder. For torch and furnace brazing, the flux is mixed with water to make paste.

What kind of flux do you use for brazing aluminum?

Nocolok® flux is an industry standard flux that works well for all 1000 and 3000 series aluminum alloys. Often, this product is used for aluminum heat exchangers and tube-to-tube joints.

What are the benefits of aluminum Dip brazing?

Benefits of Aluminum Dip Brazing. It’s clean. The molten salts act as a flux, and protect the joints from oxidation. Once the residual salts are washed away you’re left with a beautiful product which requires little in the way of final cleaning or adjustments.

Why are molten salts used in Dip brazing?

The molten salts act as a flux, and protect the joints from oxidation. Once the residual salts are washed away you’re left with a beautiful product which requires little in the way of final cleaning or adjustments. It’s cost-effective. Aluminum Dip Brazing usually requires no expensive jigs or tooling.

How does Dip brazing work in an air furnace?

How it works 1 Assemble parts and apply braze alloy where necessary. 2 Preheat parts in an air furnace to prepare for dip brazing. 3 Immerse parts in molten salt bath to melt and flow braze alloy. 4 Remove from bath to quench, clean and cool parts, aging in an air furnace as needed.

When do you apply flux to Dip brazing?

Application of Flux: Apply flux by spraying, dipping, or brushing the components before, during, or after the assembly. Stop-off bases having graphite bases are used to prevent flow of brazing metal into undesirable places such as tapped holes.