Brazing is a common option when there is a need to form joints in aluminum parts and components. It is also the most recommended option for connecting aluminum and non-aluminum parts to each other. Strong, durable and completed quickly and efficiently, brazing aluminum is a low-cost option to create a reliable joint.
However, even though it is a commonly used process, it is also important to make sure all aspects of brazing, including preparation of the parts and components, are done correctly. Failing to follow each step results in an incomplete joint, which results in poor performance of the parts or complete part failure.
The Cleaning Process
Prior to the process of brazing aluminum, it is essential to clean the surface of the joint area completely. This includes removing any dirt and organic or inorganic particles and materials. It also means ensuring that all grease or oil is removed from the area.
As brazing is a fast, lower-heat process that welding, even small amounts of surface grease, oil or contaminants can impact the flow of the flux and result in an incomplete seal. Often this is overlooked with smaller processes, and it may not be detected until the joint is put under pressure in the system or equipment.
Choice and Application of Paste
The choice of the paste used when brazing aluminum is critical. Different types of paste offer different movement in the joint, and incorrectly matching the flux to the part or component creates problems with the joint.
The application of the paste should also be consistent. Top companies offering robotic systems for the application of the paste provide precision at each step in the process. When this automation is combined with a continuous atmosphere mesh belt system for the brazing process, the result is low-cost, bright, clean and perfectly joined parts and components.
