What is one benefit of permanent joints?

Permanent joints are designed to create a lasting bond between components, ensuring that they do not come loose during operation or over time. This characteristic is critical in applications where structural integrity and stability are paramount, such as in bridges, buildings, and machinery. The robustness of permanent joints means that they can withstand significant loads and stresses without the risk of separation.

In contrast, the other choices highlight attributes that do not apply to permanent joints. For example, the ease of disassembly is characteristic of temporary joints, which are intended for situations where components need to be taken apart frequently. The weight consideration may vary but typically does not provide a definitive benefit over temporary joints. Lastly, while some permanent joints may be welded quickly, this is not a universal attribute since the speed of the process can depend on various factors such as the materials involved and specific welding techniques. Hence, the primary advantage of permanent joints is their ability to remain secure and intact under various conditions, which underlines the correctness of the chosen answer.