TheoryWelding Inspector CWI
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30 free Welding Inspector CWI questions
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Codes & Standards
AWS D1.1 is the primary structural welding code that governs welding of what base material?
Correct — A. AWS D1.1 is titled 'Structural Welding Code – Steel' and covers the welding of steel structures. Other AWS codes address aluminum (D1.2) and stainless steel (D1.6). -
Codes & Standards
AWS D1.1 applies to structures with a base metal minimum thickness of:
Correct — D. AWS D1.1 generally applies to structural steel 3/16 in (4.8 mm) and thicker. Thinner material falls under sheet-metal or other codes such as AWS D1.3. -
Codes & Standards
A prequalified WPS under AWS D1.1 does NOT require:
Correct — A. Prequalified WPSs comply with all AWS D1.1 prequalification requirements and therefore do not require procedure qualification testing. They still must be documented in writing with all essential variables. -
Codes & Standards
Which of the following welding processes is listed as prequalified in AWS D1.1?
Correct — C. SAW is listed as a prequalified process in AWS D1.1. GTAW and PAW are not prequalified under D1.1. ESW requires qualification testing. -
Codes & Standards
For prequalified fillet welds using SMAW under AWS D1.1, the maximum size of a single-pass fillet weld in the flat or overhead position is:
Correct — B. AWS D1.1 limits single-pass SMAW fillet welds in the flat (1F) and overhead (4F) positions to 1/4 in (6.4 mm) maximum. The 5/16 in limit applies to the horizontal position. Exceeding these sizes requires multiple passes. -
Codes & Standards
Under AWS D1.1, which condition would disqualify a joint from being prequalified?
Correct — D. Only joint configurations explicitly listed in AWS D1.1's prequalified details may be used without qualification testing. Any deviation — such as a non-listed geometry or dimension — requires procedure qualification by testing. -
Codes & Standards
When a WPS cannot meet prequalification requirements under AWS D1.1, the welder must qualify the procedure using:
Correct — B. A PQR documents the actual test weld results and supports a qualified WPS when prequalification requirements cannot be met. It is not just paperwork — it requires physical testing of weld specimens. -
Codes & Standards
For AWS D1.1 procedure qualification of a CJP groove weld, the minimum test plate thickness that qualifies unlimited production thickness is:
Correct — A. Under AWS D1.1, a CJP groove weld PQR test plate of 1 in (25 mm) or greater qualifies the procedure for unlimited production thickness above 1 in. -
Codes & Standards
Which essential variable change in AWS D1.1 ALWAYS requires requalification of a WPS?
Correct — D. Changing the welding process is always an essential variable requiring requalification. Changes within the same process classification (e.g., electrode diameter or number of passes) may be non-essential or supplementary essential depending on the code requirements. -
Codes & Standards
In AWS D1.1 Table 4.5 (procedure qualification test), which mechanical test is NOT required for a CJP groove weld test plate?
Correct — C. Charpy V-notch impact testing is required only when specified by the Engineer for fracture-critical or low-temperature applications; it is not a standard mandatory test in the base D1.1 procedure qualification test matrix. -
Codes & Standards
Under AWS D1.1, a welder's qualification remains in effect as long as:
Correct — A. AWS D1.1 requires that a welder's qualification remains valid as long as the process is used at least once within any 6-month period and there is no specific reason to question the welder's ability. -
Codes & Standards
A welder qualifies by welding a 3/8 in groove weld test plate in the 3G position under AWS D1.1. This qualification covers:
Correct — B. Under AWS D1.1, a 3G (vertical) groove weld qualification covers the 1G (flat) and 3G positions. It does not extend to 4G (overhead) or all positions — that requires 4G or 6G qualification. -
Codes & Standards
A welder who qualifies on a 3/8 in (10 mm) CJP groove weld test plate is qualified to weld production groove welds with a maximum thickness of:
Correct — D. AWS D1.1 qualification on a plate 3/16 in or thicker qualifies the welder for unlimited production weld thickness, not just the test plate thickness. -
Codes & Standards
What does the 'E' in the electrode classification 'E7018' stand for?
Correct — C. In AWS filler metal classification designations, 'E' stands for 'electrode'. The designation system encodes tensile strength, position, and coating/flux type in the remaining digits. -
Codes & Standards
An E7018 electrode is classified as a low-hydrogen electrode. What is the maximum allowable moisture content in the flux coating per AWS A5.1?
Correct — B. AWS A5.1 limits moisture in the coating of low-hydrogen electrodes. H4R (moisture-resistant) designations must meet ≤0.3% and survive humidity exposure. Standard H4 is limited to ≤0.3% as-received. Exceeding limits leads to hydrogen-induced cracking risk. -
Codes & Standards
Under AWS D1.1, the use of a filler metal not classified by AWS requires:
Correct — C. D1.1 requires that unclassified filler metals receive Engineer approval and be qualified through procedure qualification testing, since they cannot be assumed to meet any established classification benchmark. -
Codes & Standards
ASTM A36 steel is categorized in AWS D1.1 as a:
Correct — A. ASTM A36 (Fy = 36 ksi) falls into Group I — the lowest-strength, most weldable prequalified base metal group in AWS D1.1, requiring minimal preheat under most conditions. -
Codes & Standards
Which of the following base metals is NOT prequalified under AWS D1.1?
Correct — D. ASTM A514 (quenched and tempered, 100 ksi min yield) is not a prequalified base metal in AWS D1.1 and requires procedure qualification testing. Lower-strength steels like A36, A572 Gr 50, and A588 are prequalified. -
Codes & Standards
The primary purpose of preheating in welding is to:
Correct — C. Preheat slows the cooling rate, reduces the risk of hydrogen cracking (by allowing hydrogen to diffuse out), minimizes martensite formation, and reduces thermal shock and residual stresses. -
Codes & Standards
For ASTM A36 steel greater than 1.5 in (38 mm) thick, AWS D1.1 Table 3.2 specifies a minimum preheat temperature of:
Correct — B. AWS D1.1 Table 3.2 specifies 225°F (107°C) minimum preheat for A36 steel when the thickness exceeds 1.5 in and low-hydrogen electrodes are used, to prevent hydrogen-induced cracking in the thicker section. -
Codes & Standards
Interpass temperature in AWS D1.1 refers to:
Correct — A. Interpass temperature is the maximum temperature the weld joint (including the deposited weld metal and HAZ) is allowed to reach between successive weld passes. Exceeding it can degrade toughness and mechanical properties. -
Codes & Standards
A complete joint penetration (CJP) groove weld is defined as a groove weld in which:
Correct — B. A CJP groove weld has weld metal deposited through the complete thickness of the base material, ensuring full fusion from root to face with no unfused root area. -
Codes & Standards
For a PJP (partial joint penetration) groove weld made from one side using SMAW in a 60° groove angle, AWS D1.1 defines the effective throat as:
Correct — C. For a PJP groove weld made from one side by SMAW with a groove angle ≥60°, the effective throat = S − 1/8 in (3.2 mm), accounting for the fact that full depth cannot be reliably achieved. -
Codes & Standards
Under AWS D1.1, the maximum root face tolerance for a prequalified single-bevel-groove weld (without backing) is:
Correct — A. AWS D1.1 prequalified joint details specify a root face of 0 to 1/16 in (0 to 1.6 mm) for CJP welds without backing. Exceeding the upper tolerance can prevent full root fusion. -
Codes & Standards
Under AWS D1.1, the maximum allowable undercut for statically loaded structures (primary tension members) is:
Correct — D. AWS D1.1 limits undercut to 1/32 in (0.8 mm) on primary tension members in statically loaded structures, and 1/16 in (1.6 mm) for compression members, because undercut acts as a stress concentrator under tensile loading. -
Codes & Standards
AWS D1.1 visual inspection acceptance criteria for groove weld reinforcement (face): the maximum convexity for welds in steel plates ≥1 in (25 mm) wide is:
Correct — B. AWS D1.1 limits groove weld face reinforcement to 3/16 in (4.8 mm) maximum for base metal width ≥1 in. Excessive convexity creates stress risers and is a visual rejection criterion. -
Codes & Standards
For cyclically loaded (fatigue) structures under AWS D1.1, porosity is limited to a maximum single-pore diameter of:
Correct — C. For cyclically loaded structures, AWS D1.1 applies stricter porosity limits — individual pores may not exceed 3/32 in (2.4 mm) diameter, versus the more lenient limits for statically loaded structures. -
Codes & Standards
Under AWS D1.1 RT acceptance criteria for statically loaded structures, the maximum allowable length of an individual slag inclusion in a 3/8 in (9.5 mm) thick weld is:
Correct — C. AWS D1.1 limits individual slag inclusion length to 2/3 of the weld thickness for welds 3/8–3/4 in thick. For a 3/8 in weld: 2/3 × 3/8 in ≈ 1/4 in (6.4 mm) maximum. Inclusions exceeding this length are rejectable. -
Codes & Standards
Which NDT method is most effective at detecting surface-breaking cracks in ferromagnetic welds?
Correct — B. Magnetic particle testing (MT) is highly sensitive to surface and near-surface cracks in ferromagnetic materials. It uses magnetic fields and iron particles to reveal discontinuities that interrupt the field. -
Codes & Standards
Under AWS D1.1 for RT of groove welds, the minimum image quality indicator (IQI) sensitivity required is:
Correct — A. AWS D1.1 requires 2-2T IQI sensitivity for radiographic testing, meaning a 2% wire or hole-type IQI is used and the essential indicator (2T hole or equivalent wire) must be visible on the film.
Welding Inspector CWI sample questions
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Codes & Standards UT performed per AWS D1.1 uses a reference calibration block to set the scanning sensitivity. What standard is referenced for this calibration block?
A. ASME Section V Article 5
B. API 1104 Appendix A
C. AWS D1.1 Annex K (IIW-type block) ✓
D. ASTM E164
Correct — C. AWS D1.1 references the IIW (International Institute of Welding) type calibration block, described in D1.1 Annex K, for setting UT reference levels and calibrating sensitivity for structural weld inspection.
Discontinuities & Defects What is the key difference between a discontinuity and a defect in welding?
A. A defect is always visible to the naked eye; a discontinuity is not
B. A defect is a discontinuity that exceeds the acceptance criteria of the applicable code ✓
C. A discontinuity only occurs in the base metal; a defect only occurs in the weld metal
D. A defect requires immediate repair; a discontinuity does not require inspection
Correct — B. A discontinuity is any interruption in the normal physical structure of a material. It becomes a defect only when it exceeds the acceptance criteria specified by the applicable code or standard, making rejection mandatory.
Inspection & NDT Which of the following is the MOST fundamental NDT method used by a Certified Welding Inspector during routine weld examination?
A. Visual inspection (VT) ✓
B. Radiographic testing (RT)
C. Ultrasonic testing (UT)
D. Magnetic particle testing (MT)
Correct — A. Visual inspection (VT) is the most fundamental and most widely used NDT method. It is always performed before, during, and after welding, and is required by virtually every welding code.
Metallurgy What is the crystal structure of iron (ferrite) at room temperature?
A. Body-centered cubic (BCC) ✓
B. Face-centered cubic (FCC)
C. Hexagonal close-packed (HCP)
D. Body-centered tetragonal (BCT)
Correct — A. At room temperature, iron exists as alpha-ferrite with a body-centered cubic (BCC) crystal structure. This structure transforms to FCC austenite above 912°C (1674°F).
Welding Processes What does the acronym SMAW stand for?
A. Shielded Metal Arc Welding ✓
B. Submerged Metal Arc Welding
C. Shielded Mig Arc Welding
D. Semi-automatic Metal Arc Welding
Correct — A. SMAW stands for Shielded Metal Arc Welding, commonly called 'stick' welding. It uses a flux-coated consumable electrode to create the arc and provide shielding.
Welding Safety Which minimum filter lens shade is required for shielded metal arc welding (SMAW) at 200–400 amperes?
A. Shade 8
B. Shade 10 ✓
C. Shade 12
D. Shade 14
Correct — B. ANSI Z49.1 and OSHA 1910.133 tables specify shade 10 as the minimum for SMAW at 200–400 A. Lower shades provide insufficient UV/IR protection at this amperage range.
Weld Symbols & Joints On a welding symbol, the reference line is always drawn in what orientation?
A. Horizontal ✓
B. Vertical
C. Diagonal at 45°
D. Curved
Correct — A. Per AWS A2.4, the reference line of a welding symbol is always drawn horizontally. All other elements of the symbol are placed relative to this horizontal line.
Terms & Definitions A joint made between two members lying in the same plane is called a:
A. Butt joint ✓
B. Corner joint
C. T-joint
D. Lap joint
Correct — A. A butt joint is formed when two members are aligned in the same plane with their edges meeting. Corner, T-, and lap joints involve members at angles or overlapping.
About the Welding Inspector CWI test
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Topics in this question bank
Core formulas and field calculations
Codes, standards and compliance
Safe work practices and PPE
Tools, materials and on-site reference
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