FREE CWI Welding Inspection Methods Questions and Answers

Question 1

During a visual inspection of a completed fillet weld, a CWI observes a discontinuity where the actual leg size is consistently smaller than the specified leg size in the welding procedure specification (WPS).
Which of the following is the MOST appropriate initial action for the CWI to take?

Accepted Answer

Document the observation and compare it against acceptance criteria to determine disposition.

Answer

Immediately reject the weld and mark it for repair.

Answer

Request a re-qualification of the welder due to poor workmanship.

Answer

Perform a dye penetrant test to check for surface cracks.

Question 2

A CWI is tasked with inspecting a critical pressure vessel weld. The engineering drawings specify that the weld must be 100% radiographically tested. During the inspection, the CWI discovers that due to access limitations, only 80% of the weld length has been radiographed. What is the CWI's MOST appropriate course of action?

Accepted Answer

Require additional non-destructive testing (NDT) methods to cover the remaining 20% if feasible and permissible by code.

Answer

Accept the weld as is, noting the access limitations in the report.

Answer

Approve the partial radiography, provided the 80% tested area meets acceptance criteria.

Answer

Immediately reject the entire pressure vessel and demand a full re-weld.

Question 3

Which non-destructive testing (NDT) method is MOST effective for detecting internal discontinuities such as porosity, slag inclusions, and lack of fusion in butt welds on thick steel plates?

Accepted Answer

Radiographic Testing (RT)

Answer

Magnetic Particle Testing (MPT)

Answer

Liquid Penetrant Testing (LPT)

Answer

Visual Testing (VT)

Question 4

A CWI is performing an in-process inspection of a multi-pass groove weld. The welder has just completed the root pass. Which of the following is the MOST critical aspect for the CWI to inspect at this stage?

Accepted Answer

Absence of surface porosity and adequate root penetration/fusion.

Answer

Final weld profile and reinforcement height.

Answer

Correct interpass temperature for subsequent passes.

Answer

Overall length of the weld and material identification.

Question 5

When inspecting a weld using Magnetic Particle Testing (MPT), what is the primary purpose of applying a magnetic field to the ferromagnetic material?

Accepted Answer

To create flux leakage fields at discontinuities that attract magnetic particles.

Answer

To increase the surface temperature of the weld for better crack visibility.

Answer

To demagnetize the weld after inspection to prevent future issues.

Answer

To provide a contrasting background for enhanced visual detection of particles.

Question 6

A CWI is reviewing a Welding Procedure Specification (WPS) that specifies a preheat temperature for a specific material and thickness. During the welding operation, the CWI observes that the welder is not consistently applying preheat. What is the MOST likely consequence of insufficient preheat?

Accepted Answer

Higher cooling rates and increased susceptibility to cracking.

Answer

Increased deposition rates and weld metal fluidity.

Answer

Reduced risk of hydrogen-induced cracking and improved toughness.

Answer

Increased potential for porosity and lack of fusion.

During a visual inspection of a completed fillet weld, a CWI observes a discontinuity where the actual leg size is consistently smaller than the specified leg size in the welding procedure specification (WPS).Which of the following is the MOST appropriate initial action for the CWI to take?

During a visual inspection of a completed fillet weld, a CWI observes a discontinuity where the actual leg size is consistently smaller than the specified leg size in the welding procedure specification (WPS).
Which of the following is the MOST appropriate initial action for the CWI to take?