What is the function of cleaning agents in the brazing process?

In the brazing process, cleaning agents play a crucial role by removing oxides and contaminants from the surfaces to be joined. The presence of oxides, dirt, grease, or any foreign substances can impede the flow of the filler metal and prevent a strong bond from forming. When surfaces are clean, the molten filler metal can effectively wick into the joint, ensuring a complete and proper fill without barriers that would otherwise weaken the joint.

The cleaning agents, which can be acid-based, alkaline, or solvent-based, are specifically formulated to break down these unwanted materials, allowing for optimal adhesion and a strong, reliable brazed joint. Successful brazing relies on this preparatory step; without the use of cleaning agents, the integrity of the bond may be compromised, potentially leading to failure under stress or over time.