What is a primary concern when joining aluminum sheets together?

When joining aluminum sheets together, a primary concern is the corrosion potential of the joint. Aluminum is generally resistant to corrosion due to the formation of a protective oxide layer; however, when two different metals are joined, or when the aluminum is exposed to certain environments, galvanic corrosion can occur. This is particularly important in aircraft construction, where aluminum components may be exposed to moisture and other corrosive elements during service.

Proper surface treatment and the selection of appropriate joining techniques are crucial to minimize the risk of corrosion at the joint. For example, the use of sealants, the application of protective coatings, and ensuring that the joining materials are compatible can significantly reduce corrosion potential.

Other factors like the thickness of the sheets, the cost of aluminum, and the weight of the rivets are considerations that may influence the overall design and efficiency of assembly, but they do not directly address the immediate concern of ensuring the longevity and structural integrity of the joint in the presence of environmental factors.