Inspection & Quality Control Flashcards

Which non-destructive testing method uses high-frequency sound waves to detect internal weld defects?

Answer: Ultrasonic testing

Ultrasonic testing (UT) transmits high-frequency sound waves through the weld to detect internal discontinuities by analyzing reflected signals.

What is the primary purpose of a weld procedure specification (WPS)?

Answer: To provide direction for making production welds

A WPS provides written instructions that direct welders in making production welds to the required quality and to meet the applicable code.

A porosity defect in a weld is caused by:

Answer: Gas trapped during solidification

Porosity occurs when gas becomes entrapped within the weld metal as it solidifies, forming voids or pores.

According to AWS D1.1, incomplete fusion is classified as a:

Answer: Rejectable weld discontinuity

Incomplete fusion is a rejectable discontinuity under AWS D1.1 because it represents a lack of bond between the weld metal and the base metal or between weld passes.

When performing radiographic testing, what does a darker area on the film typically indicate?

Answer: A void or less dense area such as porosity

Darker areas on radiographic film indicate regions where more radiation passed through, which typically corresponds to voids, cracks, or porosity with lower density than sound metal.

What is undercut in a weld?

Answer: A groove melted into base metal adjacent to the weld toe

Undercut is a groove or channel melted into the base metal at the toe of the weld that reduces the effective cross-section and acts as a stress concentrator.

Which document records the actual variables used during a weld procedure qualification test?

Answer: Procedure Qualification Record (PQR)

The Procedure Qualification Record (PQR) documents the actual welding variables used and the test results obtained during procedure qualification testing.