Common miss
Direct answer
The common mistake is treating Undercut as a loose phrase instead of a rule, condition, or field decision with consequences. Groove melted into base metal adjacent to a weld toe or root and left unfilled. If you miss this area, review the explanation, tag the weak concept, and drill nearby topics such as Welding fundamentals, Inspection terminology, Welding symbol interpretation.
How to use this answer
Read the answer once, then prove it by choosing an answer in a practice question before looking at the explanation. If the miss repeats, tag the domain as Glossary and drill a smaller set before returning to mixed practice.
Prep path
CWI Study Guide
Independent CWI study guide for welding symbols, inspection fundamentals, discontinuities, NDE, and code application.
SamplesCWI Sample Questions
Public CWI Practice Test sample questions with explanations.
PracticeOpen CWI Practice Test
Start with the 10-question free set before deciding whether to unlock the full question bank.