What does bonding refer to in aircraft assembly?

In the context of aircraft assembly, bonding specifically refers to the method of joining materials using adhesives. This process involves applying a bonding material, often in liquid or paste form, to the surfaces of components, which then hardens to create a strong structural bond without utilizing mechanical fasteners like bolts or rivets. The advantages of this technique include the ability to distribute stresses over a larger area, reduce weight by eliminating the need for additional hardware, and provide excellent resistance to corrosion and fatigue.

While other processes, such as soldering, heat treating, or mechanical fastening, serve specific purposes in aircraft construction, they do not encompass the adhesive bonding method that is central to the correct response. Adhesives can be used effectively with various materials, including composites, metals, and plastics, which is critical in modern aircraft design where weight savings and material compatibility are paramount.