Which repair method is commonly used in aircraft for adding reinforcement?

Riveting is the correct choice for adding reinforcement in aircraft structures due to its effectiveness in creating strong, permanent joints that can withstand the stresses experienced during flight. This method involves fastening parts together using metal pins or fasteners called rivets, which are deformed on one end to form a secure connection. The use of rivets is particularly advantageous in aviation because it maintains the structural integrity of the aircraft while allowing for flexibility in the materials used.

Riveting is preferred over welding in many aviation applications because it does not introduce the same levels of heat and thermal distortion that welding can, which can compromise the overall strength and shape of the aircraft components. Soldering and gluing are generally not suitable for structural repairs on aircraft due to their lower strength and durability compared to riveting. Soldering is typically used for electronic connections and not for structural components, while gluing may not meet the stringent strength and safety requirements for aircraft materials.