AWS CWEng Part 2 — Applied Science Fundamentals Exam QUESTIONS AND CORRECT ANSWERS LATEST is the second examination component of the American Welding Society (AWS) Certified Welding Engineer (CWEng) certification program. The CWEng credential is designed to demonstrate professional knowledge and skill in welding engineering, including welding design, materials, welding processes, and quality control. AWS describes Part 2 as the Applied Science and Welding Fundamentals portion of the four-part CWEng examination and uses it to evaluate the scientific and engineering principles that support welding-related decision-making. The current AWS CWEng examination structure identifies three principal areas within Part 2: Strength of Materials, Heat Transfer and Fluid Mechanics, and Electricity. Strength of Materials represents approximately 40 percent of the Part 2 examination, while Heat Transfer and Fluid Mechanics and Electricity each represent approximately 30 percent. The examination therefore emphasizes applied engineering science rather than focusing solely on individual welding processes. Strength of Materials is an important preparation area because welding engineers must understand how materials and welded components respond to applied forces and loading conditions. Relevant study concepts can include stress and strain, tensile and compressive loading, shear, bending, torsion, deformation, material strength, elastic and plastic behavior, mechanical properties, and engineering calculations associated with structural components. Candidates may need to apply these principles to determine how forces affect components and how engineering decisions influence the reliability and performance of welded structures. Heat Transfer and Fluid Mechanics forms another major portion of the examination and concerns the movement of thermal energy and the behavior of fluids. Preparation can include conduction, convection, radiation, temperature changes, thermal properties, heat flow, energy relationships, fluid pressure, flow characteristics, and fundamental fluid-mechanics principles. These concepts are relevant to welding engineering because welding involves significant thermal energy, while manufacturing and engineering systems may involve fluid flow, cooling, heating, and related processes. Electricity represents the remaining major domain and provides scientific foundations relevant to electrical systems and welding equipment. Candidates can expect preparation to involve basic electrical quantities and relationships, voltage, current, resistance, electrical power, circuits, electrical energy, and principles relevant to electrical equipment used in engineering and welding environments. The Part 2 examination is designed as a closed-book computer-based multiple-choice examination. AWS's examination user guide identifies 27 questions and a two-hour, or 120-minute, examination period for Part 2, with a minimum passing score of 60 percent for the individual examination component. AWS states that the overall CWEng certification requires passing each of the four examination parts at the required level and achieving a minimum weighted composite score of 70 percent. Parts 1 and 2 may also be waived by candidates who successfully complete the Fundamentals of Engineering (FE) examination, subject to AWS requirements. Preparation should emphasize understanding and applying scientific principles rather than memorizing isolated terminology. Candidates should be comfortable with mathematical relationships, units, engineering formulas, physical principles, and interpreting practical situations involving materials, heat, fluids, and electricity. AWS states that it does not provide a dedicated CWEng examination-preparation seminar because of the breadth of basic and applied science knowledge required, and candidates are encouraged to use the AWS B5.16 specification and appropriate educational or self-study resources. The CWEng program currently identifies B5.16 as the governing qualification specification, with AWS noting the newer B5.16:2025 edition in its current program information. The broader CWEng qualification pathway also requires qualifying education and welding-related work experience, with requirements varying according to the candidate's engineering or related educational background. The credential is relevant to engineering professionals working with welded structures and components in fields such as manufacturing, construction and infrastructure, automotive, aerospace, energy, marine, and other industries where welding engineering knowledge is required. Overall, AWS CWEng Part 2 evaluates the applied scientific knowledge needed to support professional welding-engineering work, with particular emphasis on strength of materials, heat transfer and fluid mechanics, and electricity. Mastery of these subjects provides a scientific foundation for later CWEng examination components involving welding-related disciplines, fabrication, inspection, qualification, productivity, and practical welding engineering applications. Subject/Career: AWS Certified Welding Engineer (CWEng), Applied Science, Strength of Materials, Heat Transfer, Fluid Mechanics, Electricity, Welding Engineering, Materials Engineering, Welding Design, Manufacturing Engineering, Quality Engineering, Welding Technology.
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AWS CWEng Part 2 — Applied Science Fundamentals Exam
QUESTIONS AND CORRECT ANSWERS LATEST UPDATE THIS YEAR
AWS CWEng Part 2 — Applied Science Fundamentals Examination
Coverage Summary
The AWS Certified Welding Engineer (CWEng) Part 2 examination is a
closed-book, computer-based test administered at Prometric centers,
consisting of 25 multiple-choice questions with a two-hour time limit.
Candidates must achieve a minimum score of 60% on each individual
part of the CWEng examination, with an overall weighted composite
score of 70% across all four parts required for certification. Parts 1 and
2 must be successfully completed before attempting Parts 3 and 4.
The Part 2 examination covers three content domains with the following
approximate weights: Strength of Materials (40%), Heat Transfer and
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Fluid Mechanics (30%), and Electricity (30%). Core topics include stress-
strain relationships, mechanical testing, heat transfer mechanisms
(conduction, convection, radiation), fluid mechanics principles,
electrical circuits, and the application of these fundamental engineering
sciences to welding scenarios.
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
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. A steel rod with a cross-sectional area of 500 mm² is subjected to an
axial tensile load of 75 kN. What is the tensile stress?
(A) 100 MPa
(B) 125 MPa
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(C) 150 MPa
(D) 175 MPa
Answer: C
Convert 75 kN to 75,000 N. Stress = 75,000 N / 500 mm² = 150 N/mm² =
150 MPa.
3. A welded connection is subjected to a shear force of 120 kN acting
on an area of 800 mm². What is the shear stress?
(A) 100 MPa
(B) 120 MPa
(C) 150 MPa
(D) 180 MPa
Answer: C
Shear stress (τ) = Shear force / Area. τ = 120,000 N / 800 mm² = 150
N/mm² = 150 MPa.
4. During welding, which heat-transfer method moves heat through a
solid metal mainly by direct molecular interaction?
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(A) Convection
(B) Radiation
(C) Conduction
(D) Advection
Answer: C
Conduction transfers thermal energy through a material without bulk
movement of the material itself.
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
Answer: C
Rapid cooling can suppress diffusional transformations and promote
harder microstructures such as martensite in susceptible steels.