Michigan Welding Inspector Level 3
Exam Practice Questions And Correct
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1. Which welding process uses a non-consumable tungsten electrode
and shielding gas to join materials?
A. Shielded metal arc welding
B. Gas tungsten arc welding
C. Flux-cored arc welding
D. Oxy-fuel welding
Gas tungsten arc welding uses a non-consumable tungsten electrode
and an inert shielding gas to protect the weld area from
contamination.
2. What is the primary purpose of preheat in welding carbon steel?
A. To cool the weld rapidly
B. To reduce the cooling rate and minimize hydrogen cracking
C. To increase weld deposition rate
D. To eliminate the need for post-weld heat treatment
Preheat reduces the cooling rate of the weld, thereby minimizing the
risk of hydrogen-induced cracking in carbon steels.
3. In radiographic testing, what causes a “fuzzy” indication on the film?
A. Excessive film exposure
B. Poor image sharpness due to motion or scatter
C. Incorrect film processing temperature
D. Improper part orientation
, A fuzzy radiographic image is typically caused by motion blur or
excessive scatter radiation, reducing image sharpness.
4. Which standard defines acceptance criteria for discontinuities in welds
using ultrasonic testing?
A. AWS D1.1
B. ISO 9001
C. ASME Section V
D. API 1104
ASME Section V establishes the requirements for ultrasonic
examination and acceptance standards for discontinuities.
5. What is the primary disadvantage of magnetic particle testing?
A. High cost
B. Only applicable to ferromagnetic materials
C. Requires radioactive sources
D. Necessitates welding first
Magnetic particle testing is limited to ferromagnetic materials where
an induced magnetic field can reveal surface and near-surface
defects.
6. Which welding symbol element indicates weld size?
A. Tail
B. Reference line
C. Arrow
D. Dimension
The dimension indicated on the welding symbol specifies the size of
the weld required.
7. What microstructural change occurs when austenitic stainless steel is
rapidly cooled?
A. Martensite
B. Pearlite
C. Retained austenite
D. Bainite
Austenitic stainless steels typically retain the austenitic structure on
rapid cooling due to their alloying elements stabilizing that phase.
8. Which mechanical test evaluates the toughness of a weld at low
temperatures?
, A. Tensile test
B. Hardness test
C. Charpy V-notch impact test
D. Bend test
The Charpy V-notch impact test measures the energy absorbed by a
specimen during fracture at specified low temperatures.
9. In SMAW, what is the function of the flux coating?
A. To increase current
B. To cool the weld
C. To provide shielding and slag formation
D. To sharpen the electrode
Flux on a stick electrode shields the molten metal and forms slag to
protect the weld as it cools.
10. Which NDT method uses sound waves to detect internal flaws?
A. Liquid penetrant
B. Radiography
C. Ultrasonic testing
D. Visual inspection
Ultrasonic testing uses high-frequency sound waves to detect
internal discontinuities.
11. What does the welding term “undercut” refer to?
A. Excess penetration
B. A groove melted into the base metal adjacent to the weld toe
C. Incomplete root fusion
D. Overlap of weld metal
Undercut is a groove at the weld toe that can weaken the joint if not
controlled.
12. Which gas is commonly used as a shielding gas in GMAW for
carbon steel?
A. Oxygen
B. Argon
C. Carbon dioxide or argon-CO₂ mix
D. Helium
Carbon dioxide or argon-CO₂ mixtures are frequently used shielding
gases in GMAW for carbon steels.
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. Which welding process uses a non-consumable tungsten electrode
and shielding gas to join materials?
A. Shielded metal arc welding
B. Gas tungsten arc welding
C. Flux-cored arc welding
D. Oxy-fuel welding
Gas tungsten arc welding uses a non-consumable tungsten electrode
and an inert shielding gas to protect the weld area from
contamination.
2. What is the primary purpose of preheat in welding carbon steel?
A. To cool the weld rapidly
B. To reduce the cooling rate and minimize hydrogen cracking
C. To increase weld deposition rate
D. To eliminate the need for post-weld heat treatment
Preheat reduces the cooling rate of the weld, thereby minimizing the
risk of hydrogen-induced cracking in carbon steels.
3. In radiographic testing, what causes a “fuzzy” indication on the film?
A. Excessive film exposure
B. Poor image sharpness due to motion or scatter
C. Incorrect film processing temperature
D. Improper part orientation
, A fuzzy radiographic image is typically caused by motion blur or
excessive scatter radiation, reducing image sharpness.
4. Which standard defines acceptance criteria for discontinuities in welds
using ultrasonic testing?
A. AWS D1.1
B. ISO 9001
C. ASME Section V
D. API 1104
ASME Section V establishes the requirements for ultrasonic
examination and acceptance standards for discontinuities.
5. What is the primary disadvantage of magnetic particle testing?
A. High cost
B. Only applicable to ferromagnetic materials
C. Requires radioactive sources
D. Necessitates welding first
Magnetic particle testing is limited to ferromagnetic materials where
an induced magnetic field can reveal surface and near-surface
defects.
6. Which welding symbol element indicates weld size?
A. Tail
B. Reference line
C. Arrow
D. Dimension
The dimension indicated on the welding symbol specifies the size of
the weld required.
7. What microstructural change occurs when austenitic stainless steel is
rapidly cooled?
A. Martensite
B. Pearlite
C. Retained austenite
D. Bainite
Austenitic stainless steels typically retain the austenitic structure on
rapid cooling due to their alloying elements stabilizing that phase.
8. Which mechanical test evaluates the toughness of a weld at low
temperatures?
, A. Tensile test
B. Hardness test
C. Charpy V-notch impact test
D. Bend test
The Charpy V-notch impact test measures the energy absorbed by a
specimen during fracture at specified low temperatures.
9. In SMAW, what is the function of the flux coating?
A. To increase current
B. To cool the weld
C. To provide shielding and slag formation
D. To sharpen the electrode
Flux on a stick electrode shields the molten metal and forms slag to
protect the weld as it cools.
10. Which NDT method uses sound waves to detect internal flaws?
A. Liquid penetrant
B. Radiography
C. Ultrasonic testing
D. Visual inspection
Ultrasonic testing uses high-frequency sound waves to detect
internal discontinuities.
11. What does the welding term “undercut” refer to?
A. Excess penetration
B. A groove melted into the base metal adjacent to the weld toe
C. Incomplete root fusion
D. Overlap of weld metal
Undercut is a groove at the weld toe that can weaken the joint if not
controlled.
12. Which gas is commonly used as a shielding gas in GMAW for
carbon steel?
A. Oxygen
B. Argon
C. Carbon dioxide or argon-CO₂ mix
D. Helium
Carbon dioxide or argon-CO₂ mixtures are frequently used shielding
gases in GMAW for carbon steels.
