Welding Inspector CWI Exam Questions & Answers 2026 (11–20)

Question 1

Under AWS D1.1, a welder's qualification remains in effect as long as:

TheoryPractice · Accepted Answer

The welder uses the qualified process within 6 months without a reason to question ability. 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.

Question 2

A welder qualifies by welding a 3/8 in groove weld test plate in the 3G position under AWS D1.1. This qualification covers:

TheoryPractice · Accepted Answer

1G and 3G positions for groove welds. 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.

Question 3

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:

TheoryPractice · Accepted Answer

Unlimited. 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.

Question 4

What does the 'E' in the electrode classification 'E7018' stand for?

TheoryPractice · Accepted Answer

Electrode. 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.

Question 5

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?

TheoryPractice · Accepted Answer

0.3% for H4R designation or less. 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.

Question 6

Under AWS D1.1, the use of a filler metal not classified by AWS requires:

TheoryPractice · Accepted Answer

Approval by the Engineer and qualification testing. 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.

Question 7

ASTM A36 steel is categorized in AWS D1.1 as a:

TheoryPractice · Accepted Answer

Group I, prequalified base metal. 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.

Question 8

Which of the following base metals is NOT prequalified under AWS D1.1?

TheoryPractice · Accepted Answer

ASTM A514 Grade S with 100 ksi minimum yield. 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.

Question 9

The primary purpose of preheating in welding is to:

TheoryPractice · Accepted Answer

Reduce the risk of hydrogen-induced cracking and minimize thermal shock. 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.

Question 10

For ASTM A36 steel greater than 1.5 in (38 mm) thick, AWS D1.1 Table 3.2 specifies a minimum preheat temperature of:

TheoryPractice · Accepted Answer

225°F (107°C). 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.

Welding Inspector CWI Exam Questions & Answers 2026 (11–20)

More Welding Inspector CWI practice questions

Free practice here. Timed mocks when you are ready.