If a welding fabrication becomes unacceptably distorted, what means of distortion correction should be avoided?

Correct Answer: Option C — Employing mechanical straightening techniques.

Mechanical straightening involves applying cold-working forces to distorted steel, which can introduce severe residual stresses and potentially initiate brittle fractures. USCG standards prioritize thermal methods or controlled re-welding over mechanical force, as mechanical straightening can compromise the metallurgical properties and structural integrity of the affected marine machinery components.