What is the process of copper brazing?

Copper brazing is an important technique used in many industrial processes to join two separate pieces of metal together. This process is often chosen over welding and soldering due to its strength and flexibility, making it an ideal choice for a variety of applications. In this blog post, we will discuss the process of copper brazing in detail, exploring the different steps required and the materials used in the process.

We will also look at the benefits of copper brazing and how it is used in a variety of industries to create reliable and lasting connections between metal pieces. Finally, we will discuss the safety precautions necessary when performing a copper brazing job, ensuring that the right safety measures are taken before, during, and after the welding process. By the end of this blog post, you should have a better understanding of what copper brazing is and how it is used.

1. Prepping the workpiece

The first step in the copper brazing process is prepping the workpiece. This involves cleaning the surface to remove any dirt, dust, or oils, as well as roughening it up to provide a better surface for the filler material to adhere to. Additionally, any gaps or holes should be filled with a flux-cored rod or paste before brazing begins. This prevents oxidation of the joint and provides a better bond. Finally, the workpiece should be heated with a torch to remove any moisture and to provide an ideal temperature for brazing.

2. Applying the flux

The second step in the copper brazing process is applying the flux. The flux is an essential component of the brazing process because it prevents oxidation and corrosion of the copper by creating a protective barrier between the copper and the atmosphere. This also helps to improve the flow of the filler material, which will help ensure a strong joint. Applying the flux is done by dipping the joint in the flux or brushing it on with a soft brush. The flux should be applied to all the surfaces that need to be brazed, including the filler material, to ensure proper bonding.

3. Heating the workpiece and applying the brazing alloy

The third step in copper brazing is heating the workpiece and applying the brazing alloy. The workpiece is heated with a torch or furnace, and the temperature should be between 1020 and 1040 degrees Celsius. The brazing alloy is then added directly to the joint, where it melts and bonds with the workpiece materials.


Copper brazing is a reliable and efficient way of joining two materials, such as copper to steel, together with a filler metal. The filler metal melts and flows into the gap between the two pieces, creating a strong bond that can withstand high temperatures and vibrations. By understanding and following the steps in the process of copper brazing, you can ensure a successful and reliable braze joint.