AME 8 Q5

1 / 4

What maintenance should be carried out to ensure the continued structural integrity of a vessel with an aluminum superstructure attached to a steel hull?

D. Continuous monitoring of temperature changes, ensuring that the aluminum superstructure is always kept at a specific temperature range to avoid expansion issues.

B. Frequent repainting of the aluminum superstructure only, ensuring that the steel hull is left uncoated to maintain natural corrosion resistance.

C. Routine checks for structural damage to the aluminum superstructure, replacing all steel components every few years, and avoiding any contact with seawater.

A. Regular inspection and cleaning of joints to prevent galvanic corrosion, application of protective coatings to both aluminum and steel surfaces, and periodic replacement of anodes if used for cathodic protection.

2 / 4

What is a typical transition joint used to attach an aluminum superstructure to a steel hull?

B. A welded joint where aluminum and steel are joined directly using conventional welding techniques, despite the differences in their melting points.

A. A mechanical joint that uses a non-corrosive insulating material between the aluminum and steel, such as a plastic or rubber gasket, to prevent galvanic corrosion and ensure a secure connection.

D. A bonded joint using epoxy adhesive to attach the aluminum superstructure to the steel hull, without any additional protection against corrosion.

C. A riveted joint with aluminum and steel rivets, where no insulating material is used, relying solely on the mechanical strength of the rivets.

3 / 4

Why is it not normal practice to join aluminum superstructures to a steel hull using conventional welding techniques?

D. Conventional welding techniques result in high levels of toxic fumes, making the process unsafe for the workers.

C. Aluminum and steel welds produce excessive heat, causing warping and distortion, which affects the structural integrity of the vessel.

A. Conventional welding techniques cannot effectively join aluminum and steel due to differences in melting points, which can lead to weak joints and potential structural failures.

B. Conventional welding techniques are too expensive and time-consuming for joining aluminum to steel and require special equipment.

4 / 4

What are the particular problems associated with an aluminum superstructure when it is bonded to a steel hull?

D. The paint and coating systems applied to the aluminum and steel can react chemically, causing surface deterioration and reduced adhesion.

B. The aluminum superstructure often becomes too heavy for the steel hull, causing balance and stability issues for the vessel.

C. The differing thermal expansion rates between aluminum and steel lead to frequent joint failures and require special joint designs.

A. The formation of galvanic corrosion due to the electrical difference between aluminum and steel, which can lead to accelerated degradation of the aluminum and potential structural issues.

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