Which tool is typically used to measure straightness and detect distortion in welded connections?

• A. Straight edge or level checks.
• B. Tape measure.
• C. Caliper.
• D. Protractor

Answer: (A)

Measuring straightness and detecting distortion in welded connections relies on establishing a true reference surface and then checking how the weld and adjoining members align to that surface. A straight edge laid across the weld and a level or spirit level used across the joint are the standard tools for this purpose. If the weld has caused warp, bow, or misalignment, the straight edge won’t sit flush or the level’s bubble won’t stay centered, signaling distortion. You can check both horizontal and vertical planes by placing the straight edge along the weld line at several points and looking for gaps or rocking. Other tools measure different things—tape measures length, a caliper measures small dimensions, and a protractor measures angles—so they don’t directly reveal straightness in welded connections.