Fillet welded patches should NOT be used to:

Fillet welded patches should NOT be used to:

• A. Cover cracks
• B. Act as reinforcement of a corroded area
• C. On materials that were originally PWHTed
• D. On the vessel interior

Answer: (B)

Fillet welded patches are a common method used to repair pressure vessels; however, they have specific limitations and appropriate applications. The choice that relates to inappropriate use of fillet welded patches is related to acting as reinforcement of a corroded area. When dealing with a corroded area, simply adding a fillet welded patch may not adequately address the underlying issues of the base material. Corrosion can affect the integrity and load-bearing capacity of the material, and a patch could debilitate the structure rather than reinforce it. Instead, more comprehensive measures should be taken in such cases—like replacing the affected area entirely or utilizing a technique that would restore the structural integrity of the original material rather than merely layering over it. Fillet welded patches might be acceptable in other scenarios, such as covering cracks or certain repairs on the vessel interior, provided specific conditions are met. Additionally, fillet welded patches can be suitable for components that were originally post-weld heat treated (PWHT), as long as the repair methods account for the integrity of the original treatment.

Fillet welded patches are a common method used to repair pressure vessels; however, they have specific limitations and appropriate applications. The choice that relates to inappropriate use of fillet welded patches is related to acting as reinforcement of a corroded area.

When dealing with a corroded area, simply adding a fillet welded patch may not adequately address the underlying issues of the base material. Corrosion can affect the integrity and load-bearing capacity of the material, and a patch could debilitate the structure rather than reinforce it. Instead, more comprehensive measures should be taken in such cases—like replacing the affected area entirely or utilizing a technique that would restore the structural integrity of the original material rather than merely layering over it.

Fillet welded patches might be acceptable in other scenarios, such as covering cracks or certain repairs on the vessel interior, provided specific conditions are met. Additionally, fillet welded patches can be suitable for components that were originally post-weld heat treated (PWHT), as long as the repair methods account for the integrity of the original treatment.