When should box patches be utilized?

Box patches are a highly effective damage control method, particularly useful for addressing leaks or breaches in structures where jagged edges are present. The rationale behind using box patches in this scenario stems from the need to secure the integrity of the material and prevent further damage. Jagged edges can create uneven surfaces, which might complicate the repair process if addressed with standard patching techniques.

When applying a box patch over these jagged edges, the patch can be contoured to fit the irregularities, ensuring a more dependable seal. This technique not only enhances the overall strength of the repair but also mitigates the risk of additional stresses on the structure that could lead to further failure.

Utilizing box patches specifically for longer cracks that do not require welding, or on flat surfaces, can be effective in certain situations but is not their primary purpose. They are designed to deal with the challenges posed by irregular edges, making option B the most suitable choice among the alternatives presented.