What is a common repair technique for aluminum aircraft structures?

Using rivets to fasten new pieces or patches is a common repair technique for aluminum aircraft structures due to the unique properties of aluminum and the design of aircraft. Riveting provides a reliable and strong method for joining aluminum sections, as it allows for flexibility in the joints, which can accommodate the materials' expansion and contraction due to temperature changes. This method also offers excellent fatigue resistance, which is especially important in aviation applications where materials are subjected to cyclic loading.

Moreover, the riveting process helps maintain the integrity of the aircraft's structure, ensuring that the joined components can withstand the stresses experienced during flight. Unlike welding, which can alter the metallurgical properties of aluminum and may require extensive surface preparation and post-weld treatments, riveting is less invasive and typically requires simpler tools.

This repair technique is widely used in the aviation industry both for its effectiveness and because it aligns well with the overall design philosophy of aircraft, where strength-to-weight ratios are critical. The other options might not provide the same level of reliability or may not be appropriate for use in aluminum structures, making riveting the preferred choice in many repair scenarios.