What is fit-up in welding?

• A. The weld color and cosmetic finish after welding
• B. The alignment, gap, bevel, and joint preparation before welding
• C. The sequence of welding passes used
• D. The post-weld heat treatment schedule

Answer: (B)

Fit-up is about how the joint parts are arranged and prepared before welding. It covers alignment of the pieces, the gap between them, the bevel or edge prep, and overall joint preparation so the weld can be deposited correctly and the joint geometry is maintained.

This is why the best choice describes alignment, gap, bevel, and joint preparation before welding. Getting fit-up right ensures the root of the weld fuses properly, the weld sits in the intended position, and distortion or misalignment is minimized. Poor fit-up can lead to defects such as gaps, misalignment, improper penetration, or difficulty achieving a sound root pass.

The other options relate to aspects that occur after preparation or during the welding process rather than before welding. Weld color and cosmetic finish pertain to appearance after welding, the sequence of welding passes relates to the welding procedure, and post-weld heat treatment schedules pertain to treatment after welding.