Diagnostic Assessment and Exam-Domain Mapping

Why a Diagnostic Comes First

Before you can prepare efficiently for four credential exams, you need an honest picture of where you stand. A diagnostic assessment does exactly that: it measures what you already know and what you do not, so your study time targets real gaps instead of topics you have already mastered. This lesson introduces you to each credential, explains how exam content is organized into testable domains, walks you through the diagnostic process, and shows you how to turn your scores into a written remediation plan.

The Four Credentials at a Glance

AWS D1.1 Certified Welder (CW): Issued by the American Welding Society, this credential proves you can produce welds that meet the Structural Welding Code—Steel. Qualification is performance-based: you weld test plates or pipe in specific positions and processes, and the results are evaluated against code acceptance criteria. A written component covers code knowledge and safety.

AWS SENSE Level 1–2: The Schools Excelling through National Skills Education program defines what a well-trained entry-level and intermediate welder knows and can do. SENSE combines written knowledge tests with hands-on performance tests across process theory, safety, print reading, and weld quality evaluation.

NCCER Welding Levels 1–4: The National Center for Construction Education and Research structures craft training in four progressive levels, from basic safety and oxyfuel cutting through advanced SMAW, GMAW, FCAW, GTAW, and pipe welding. Each level ends with written and performance assessments recorded in NCCER's national Registry.

ASME Section IX: The Boiler and Pressure Vessel Code, Section IX establishes qualification requirements for welders and welding procedures on pressure-retaining items. The welder qualification test (WPQ) focuses on pipe and pressure vessel joints; visual and bend-test acceptance criteria are defined within the code.

Exam Domains You Will Be Tested On

All four credentials test overlapping but distinct bodies of knowledge. The major domains are:

• Safety and health — PPE selection, lockout/tagout (LOTO), ventilation, fire prevention, arc-flash protection, confined space awareness, and handling of compressed gases.
• Process theory — arc physics, heat input, electrode and filler metal selection, shielding gases, polarity.
• Joint design and weld symbols — AWS A2.4 welding symbols, groove geometries, root openings, bevel angles.
• Metallurgy — base-metal classification, heat-affected zone behavior, preheat and interpass temperature, weld distortion.
• Code requirements — essential variables, welder qualification ranges, position and process limitations, procedure qualification records (PQR) and welding procedure specifications (WPS).
• Weld quality and inspection — visual inspection criteria, defect classification (porosity, undercut, incomplete fusion, cracks, overlap), and accept/reject decision-making.

Knowing which domains each credential emphasizes most helps you allocate study hours wisely.

The Written Diagnostic

You will complete a 100-question multiple-choice test drawn proportionally from all six domains across all four content outlines. Answer every question; do not skip. Guessing gives the instructor useful information about which areas feel unfamiliar to you. Your instructor will return the scored test with a domain-by-domain breakdown showing the number correct out of the number asked in each area. Any domain below 75 percent requires targeted remediation.

The Visual-Inspection Practical

After the written diagnostic you will inspect six pre-made weld coupons under a time limit. Three coupons represent structural joints (evaluated against AWS D1.1 visual acceptance criteria). Three represent pipe joints (evaluated against ASME Section IX visual requirements). For each coupon you will:

1. Examine the weld visually using adequate lighting and, where needed, a weld gauge.

2. Record every discontinuity you observe, identifying it by type.

3. Compare each discontinuity to the applicable acceptance criteria.

4. Mark the coupon accept or reject on your inspection report form and state your reason.

Safety reminder: weld coupons can have sharp edges and hot-work residue. Wear cut-resistant gloves when handling coupons, safety glasses at all times in the shop, and keep your work area clear of ignition sources.

To meet the lesson check standard, you must correctly classify at least 80 percent of the defects present across the six coupons. This is not a pass/fail gate for the course — it is a benchmark that tells you and your instructor where your inspection skill needs work.

Building Your Personal Remediation Plan

Once scores are returned, you fill out a one-page Personal Remediation Plan. The plan has three columns:

1. Weak domain — any area below 75 percent on the written diagnostic, or defect types you missed on the practical.

2. Course lesson(s) that address it — specific lessons in this course mapped to that domain.

3. Daily practice target — a concrete, measurable action (for example, "complete 20 weld-symbol identification problems per study session" or "re-read the NCCER module on joint design and answer all review questions").

Your instructor reviews and approves the plan before Lesson 2 begins. Treat it as a living document: update it as you progress and domains improve.

Safety Points That Apply to This Lesson

• PPE in the inspection area: Safety glasses and cut-resistant gloves are required when handling coupons.
• Lockout/tagout awareness: Even in a theory lesson held near welding stations, be aware of energized equipment nearby. Never touch equipment controls unless you are the assigned operator.
• Ventilation: Weld fume residue on coupons is not an active hazard, but if grinding or cutting is occurring elsewhere in the shop, ensure general ventilation is operating.
• Honest self-assessment: Safety in real-world welding depends on knowing your qualification limits. The same discipline applies here — report your actual scores, not the scores you wish you had.