CRI exam — how many weld acceptance criteria do you actually need to memorize?
Taking the CRI Certified Radiographic Interpreter exam in about 5 weeks. I've been working in NDT for 4 years, mostly UT, but I moved to a shop that does radiographic interpretation and my supervisor wants me certified within 90 days. The study material is dense.
My main concern is the weld discontinuity acceptance criteria. AWS D1.1, ASME Section V, and API 1104 all have slightly different acceptance limits and the exam reportedly pulls from all three. I keep confusing which standard allows what porosity cluster size or incomplete fusion tolerance. Do I need exact millimeter values or is it more about recognizing the category of defect?
My approach so far: reading the ASNT study guide, reviewing actual radiographs from my shop, and doing about 2 hours/day. Scored 66% on a timed practice set last week and hoping to get to 80%+ before the real thing.
Any advice on where most candidates struggle? Specifically curious about IQI placement and density range questions — those feel abstract compared to just reading a film.
66% is pretty close to where I was 5 weeks out and I passed at 78%. The density range and film density questions clicked once I started doing them under timed conditions rather than looking things up. Speed matters on that exam.
IQI placement questions were a bigger chunk of my exam than I expected. Know the 2% rule cold and understand the difference between hole-type and wire IQIs. I probably saw 8-10 questions that touched on IQI in some way.
The actual film interpretation portion is more forgiving than the code section in my opinion. If you're 4 years in NDT you probably have the visual pattern recognition down. The code knowledge gaps are where most experienced techs get surprised.
For acceptance criteria I'd focus on the differences between standards rather than memorizing every value. They like to test whether you know that ASME and AWS treat linear indications differently. That comparison framework is more useful than rote memorization.
Honestly, looking back, I stressed way too much about memorizing every single acceptance criteria table. What actually showed up on the exam was more about understanding the logic behind the criteria — knowing that porosity limits differ between structural and pressure vessel codes, or why undercut depth matters differently depending on the service environment. The specific numbers you need cold are the ones in AWS D1.1 and ASME Section V, but more importantly you need to recognize which code applies to a given scenario before you even look at the acceptance column.
Four years in UT actually helps more than you'd think. You already understand discontinuity types and their formation mechanisms — that's half the battle. The shift is learning to characterize what you're seeing on film rather than what you're hearing in a waveform. Elongated indications, whether something is planar vs. volumetric, aspect ratios — that's where your experience translates. The parts that tripped up people in my cohort were film density ranges and the geometric unsharpness calculations, which feel more formulaic if you haven't been doing hands-on RT interpretation daily.
Five weeks is tight but doable if you're already working in the field. Focus your last two weeks almost entirely on practice questions — reading the explanation for every wrong answer matters more than re-reading the reference material at that point. The exam has a way of wording scenarios that sounds ambiguous until you've seen enough variations. Repetition is how you build the pattern recognition to work through those quickly under time pressure.