Page 1 of 149
AWS Certified Welding Engineer (CWEng) Exam
QUESTIONS AND VERIFIED ANSWERS WITH
RATIONALES
AWS Certified Welding Engineer (CWEng) Examination
10-Point Exam Coverage — Mostly Tested Areas
1. Mathematics, Physics, and Chemistry — engineering mathematics, algebra, geometry,
trigonometry, units, forces, work, energy, power, pressure, temperature, heat, electricity,
chemical reactions, gases, and basic scientific calculations.
2. Strength of Materials — stress, strain, elasticity, yield strength, tensile strength, shear, bending,
torsion, fatigue, fracture, buckling, loads, deformation, and basic weldment structural analysis.
3. Heat Transfer and Fluid Mechanics — conduction, convection, radiation, thermal expansion,
heat flow, temperature gradients, fluid pressure, flow, viscosity, gas behavior, and heat-related
welding calculations.
4. Electricity and Arc Physics — voltage, current, resistance, electrical power, polarity, arc
characteristics, arc length, electrical circuits, magnetic effects, power sources, and welding-
current control.
5. Welding Processes and Controls — SMAW, GMAW, FCAW, GTAW, SAW, resistance welding,
plasma arc welding, oxyfuel processes, process selection, equipment, parameters, shielding,
heat input, and process control.
6. Welding Metallurgy and Materials — carbon steels, alloy steels, stainless steels, aluminum,
nickel alloys, titanium, cast iron, heat-affected zones, phase changes, hardening, embrittlement,
cracking, preheat, interpass temperature, and postweld heat treatment.
7. NDE and Weld Discontinuities — visual inspection, radiographic testing, ultrasonic testing,
magnetic particle testing, liquid penetrant testing, common weld discontinuities, defect causes,
acceptance criteria, and examination selection.
8. Weld Design, Filler Metals, Brazing and Soldering — joint design, weld sizing, fillet welds,
groove welds, load transfer, stress concentration, filler-metal selection, weld symbols, brazing,
soldering, and joint efficiency.
9. Codes, Specifications, Qualification, and Inspection — AWS D1.1 concepts, WPS, PQR, welder
performance qualification, fabrication requirements, inspection planning, quality assurance,
quality control, acceptance criteria, and documentation.
10. Practical Welding Engineering, Productivity, and Safety — fabrication planning, welding
economics, productivity, distortion control, repair decisions, production troubleshooting,
welding safety, engineering judgment, and application of welding requirements to real projects.
AWS CWEng Practice Questions With Answers and Rationales
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Questions 1–50
1.
A steel member carries a tensile load of 60 kN through an area of 300 mm². What average tensile stress
develops in the member?
A. 20 MPa
B. 100 MPa
C. 200 MPa
D. 300 MPa
Answer: C. 200 MPa
Rationale: Stress equals force divided by area. Converting 60 kN to 60,000 N and dividing by 300 mm²
gives 200 N/mm², or 200 MPa.
2.
During welding, which heat-transfer method moves heat through a solid metal mainly by direct
molecular interaction?
A. Radiation
B. Convection
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C. Conduction
D. Evaporation
Answer: C. Conduction
Rationale: Conduction transfers thermal energy through a material without bulk movement of the
material itself.
3.
A welding engineer needs to reduce excessive distortion in a long welded assembly. Which approach is
generally most effective during production planning?
A. Increase random weld length
B. Use balanced welding sequences
C. Remove all tack welds
D. Eliminate joint restraint
Answer: B. Use balanced welding sequences
Rationale: Balanced welding sequences can reduce uneven heating and shrinkage, which helps control
angular and longitudinal distortion.
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4.
Which welding process normally uses a continuously fed solid wire electrode and an externally supplied
shielding gas?
A. SMAW
B. GMAW
C. SAW
D. GTAW
Answer: B. GMAW
Rationale: Gas metal arc welding uses a continuously fed consumable wire and shielding gas.
5.
A welding engineer observes excessive hardness in the heat-affected zone of a carbon steel weld. Which
condition can strongly increase this risk?
A. Very slow cooling
B. High preheat temperature
C. Rapid cooling
D. Low carbon content
AWS Certified Welding Engineer (CWEng) Exam
QUESTIONS AND VERIFIED ANSWERS WITH
RATIONALES
AWS Certified Welding Engineer (CWEng) Examination
10-Point Exam Coverage — Mostly Tested Areas
1. Mathematics, Physics, and Chemistry — engineering mathematics, algebra, geometry,
trigonometry, units, forces, work, energy, power, pressure, temperature, heat, electricity,
chemical reactions, gases, and basic scientific calculations.
2. Strength of Materials — stress, strain, elasticity, yield strength, tensile strength, shear, bending,
torsion, fatigue, fracture, buckling, loads, deformation, and basic weldment structural analysis.
3. Heat Transfer and Fluid Mechanics — conduction, convection, radiation, thermal expansion,
heat flow, temperature gradients, fluid pressure, flow, viscosity, gas behavior, and heat-related
welding calculations.
4. Electricity and Arc Physics — voltage, current, resistance, electrical power, polarity, arc
characteristics, arc length, electrical circuits, magnetic effects, power sources, and welding-
current control.
5. Welding Processes and Controls — SMAW, GMAW, FCAW, GTAW, SAW, resistance welding,
plasma arc welding, oxyfuel processes, process selection, equipment, parameters, shielding,
heat input, and process control.
6. Welding Metallurgy and Materials — carbon steels, alloy steels, stainless steels, aluminum,
nickel alloys, titanium, cast iron, heat-affected zones, phase changes, hardening, embrittlement,
cracking, preheat, interpass temperature, and postweld heat treatment.
7. NDE and Weld Discontinuities — visual inspection, radiographic testing, ultrasonic testing,
magnetic particle testing, liquid penetrant testing, common weld discontinuities, defect causes,
acceptance criteria, and examination selection.
8. Weld Design, Filler Metals, Brazing and Soldering — joint design, weld sizing, fillet welds,
groove welds, load transfer, stress concentration, filler-metal selection, weld symbols, brazing,
soldering, and joint efficiency.
9. Codes, Specifications, Qualification, and Inspection — AWS D1.1 concepts, WPS, PQR, welder
performance qualification, fabrication requirements, inspection planning, quality assurance,
quality control, acceptance criteria, and documentation.
10. Practical Welding Engineering, Productivity, and Safety — fabrication planning, welding
economics, productivity, distortion control, repair decisions, production troubleshooting,
welding safety, engineering judgment, and application of welding requirements to real projects.
AWS CWEng Practice Questions With Answers and Rationales
, Page 2 of 149
Questions 1–50
1.
A steel member carries a tensile load of 60 kN through an area of 300 mm². What average tensile stress
develops in the member?
A. 20 MPa
B. 100 MPa
C. 200 MPa
D. 300 MPa
Answer: C. 200 MPa
Rationale: Stress equals force divided by area. Converting 60 kN to 60,000 N and dividing by 300 mm²
gives 200 N/mm², or 200 MPa.
2.
During welding, which heat-transfer method moves heat through a solid metal mainly by direct
molecular interaction?
A. Radiation
B. Convection
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C. Conduction
D. Evaporation
Answer: C. Conduction
Rationale: Conduction transfers thermal energy through a material without bulk movement of the
material itself.
3.
A welding engineer needs to reduce excessive distortion in a long welded assembly. Which approach is
generally most effective during production planning?
A. Increase random weld length
B. Use balanced welding sequences
C. Remove all tack welds
D. Eliminate joint restraint
Answer: B. Use balanced welding sequences
Rationale: Balanced welding sequences can reduce uneven heating and shrinkage, which helps control
angular and longitudinal distortion.
, Page 4 of 149
4.
Which welding process normally uses a continuously fed solid wire electrode and an externally supplied
shielding gas?
A. SMAW
B. GMAW
C. SAW
D. GTAW
Answer: B. GMAW
Rationale: Gas metal arc welding uses a continuously fed consumable wire and shielding gas.
5.
A welding engineer observes excessive hardness in the heat-affected zone of a carbon steel weld. Which
condition can strongly increase this risk?
A. Very slow cooling
B. High preheat temperature
C. Rapid cooling
D. Low carbon content
