CWI Fundamentals Tech 4 — Questions and Answers
Question 1: What does the acronym 'HAZ' stand for in welding metallurgy?
- High Alloy Zone
- Heat-Affected Zone (Correct answer)
- Hydrogen Absorption Zone
- Hardened Arc Zone
Correct answer: Heat-Affected Zone
The Heat-Affected Zone (HAZ) is the area of base metal whose microstructure and properties have been altered by welding heat without melting.
Question 2: Which nondestructive examination method is best suited for detecting subsurface planar discontinuities in a weld?
- Magnetic particle testing (MT)
- Liquid penetrant testing (PT)
- Ultrasonic testing (UT) (Correct answer)
- Visual testing (VT)
Correct answer: Ultrasonic testing (UT)
Ultrasonic testing (UT) can detect subsurface discontinuities including planar flaws like lack of fusion and cracks.
Question 3: What is the purpose of the 'essential variable' concept in welding procedure qualification?
- To define cosmetic weld appearance standards
- To identify parameters whose change requires requalification of the WPS (Correct answer)
- To set minimum tensile strength values
- To classify electrodes by diameter
Correct answer: To identify parameters whose change requires requalification of the WPS
Essential variables are those parameters whose change could affect the mechanical properties of the weld, requiring the WPS to be requalified.
Question 4: In radiographic testing, a higher density (darker area) on a film indicates the presence of:
- Denser metal or inclusions
- Less material or void-type discontinuities (Correct answer)
- Correct exposure with no flaws
- Excessive radiation scatter
Correct answer: Less material or void-type discontinuities
Darker (higher density) areas on RT film indicate less material for radiation to penetrate, suggesting voids, porosity, or cracks.
Question 5: Which of the following is considered an 'unacceptable' weld profile condition per AWS D1.1?
- Slight convexity on a fillet weld
- Overlap (cold lap) at the weld toe (Correct answer)
- A flat weld face on a groove weld
- A smooth transition from weld to base metal
Correct answer: Overlap (cold lap) at the weld toe
Overlap (cold lap) is unacceptable because it creates a notch at the weld toe that can initiate fatigue cracks without proper fusion.
Question 6: What is 'dilution' in welding?
- Thinning of base metal by grinding
- The mixing of base metal into the weld metal deposit (Correct answer)
- Reducing electrode diameter for lower heat
- Adding flux to reduce spatter
Correct answer: The mixing of base metal into the weld metal deposit
Dilution is the percentage of base metal melted into the weld pool, which changes the chemical composition of the deposited weld metal.
Question 7: A Procedure Qualification Record (PQR) is defined as:
- The inspector's daily log of weld observations
- A document that records actual welding conditions used to qualify a WPS (Correct answer)
- A list of qualified welders on a project
- The written welding instructions given to a welder
Correct answer: A document that records actual welding conditions used to qualify a WPS
A PQR is the record of welding data and test results used to support and qualify a Welding Procedure Specification (WPS).
CWI Fundamentals Tech 4
What does the acronym 'HAZ' stand for in welding metallurgy?