CWI Ultimate Review 4

Question 1

Which electrode classification is considered a low-hydrogen electrode?

Accepted Answer

E7018

Answer

E7018 is a low-hydrogen electrode (indicated by the '8' suffix) requiring moisture-controlled storage and often preheating to prevent hydrogen-induced cracking.

Question 2

A CWI finds a crack in a completed structural weld. What is the FIRST action the inspector should take?

Accepted Answer

Document and report the discontinuity to the responsible party per project procedures

Answer

The CWI's primary role is to document and report discontinuities to the responsible party; the inspector does not typically direct repairs or make acceptance decisions unilaterally.

Question 3

What is the correct technique for measuring the throat of a fillet weld with a fillet weld gauge?

Accepted Answer

Measure the leg length and calculate the theoretical throat as 0.707 × leg

Answer

The theoretical throat of an equal-leg fillet weld is calculated as 0.707 times the leg length, which is what fillet weld gauges based on leg length reflect.

Question 4

Lamellar tearing in a weld joint is most likely to occur in:

Accepted Answer

T-joints or corner joints with high restraint and through-thickness stress

Answer

Lamellar tearing occurs in the base metal of highly restrained T-joints and corner joints due to through-thickness tensile stresses on material with poor through-thickness ductility (low reduction of area).

Question 5

On a welding procedure specification (WPS), which of the following is an ESSENTIAL variable for SMAW per AWS D1.1?

Accepted Answer

Change in post-weld heat treatment (PWHT) when not originally required

Answer

Addition of PWHT when it was not part of the original qualified procedure is an essential variable requiring requalification for SMAW per AWS D1.1.

CWI Practice Test

CWI Practice Test

CWI Ultimate Review 4