What is the role of a fillet seal in aerospace assembly?

The role of a fillet seal in aerospace assembly primarily involves creating a primary seal along seams. Fillet seals are typically used to ensure that joints and seams in aircraft structures are airtight and fluid-tight, thereby preventing any leakage of fluids or gases. This sealing method is crucial for maintaining the integrity of the systems within an aircraft, particularly in areas where different materials join together and may be susceptible to environmental factors.

In aerospace applications, a well-formed fillet seal can enhance the performance of the assembly by reducing the potential for corrosion and other damage that can arise from the ingress of moisture or contaminants. The sealing process helps to create a dependable barrier that contributes to the overall reliability of the aircraft.

While sealing against moisture is important, it is a secondary function, as the primary focus of the fillet seal is to ensure a tight joint between components. The structural integrity is enhanced by the proper application of fillet seals, but the seal itself focuses more on preventing leaks than on providing strength.