Why it matters
Direct answer
What is the simplest difference between a WPS and a PQR matters because CWI fundamentals often test document roles: the WPS directs welding, while the PQR supports qualification history. The CWI Practice Test can test whether you recognize the principle behind a situation and choose the safest or most technically correct response. Pair it with Welding fundamentals, Inspection terminology, Welding symbol interpretation so the idea does not sit in isolation.
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 Part A fundamentals 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 20-question free set before deciding whether to unlock the paid bank.