API 577 Welding Inspection and Metallurgy Examination Practice Test
Welding inspection and metallurgy involve evaluating weld quality, the effects of welding heat on steel, and the evidence revealed by mechanical tests and nondestructive examination. API 577 practice topics include interpreting radiographic indications, distinguishing discontinuities from defects, assessing hydrogen-assisted cracking risk, and understanding weld details such as run-on tabs and heat-affected zones.
Exam overview
About the API 577 Welding Inspection and Metallurgy Examination Exam
Inspection decisions require connecting welding conditions and material behavior to observed evidence. Metallurgical concepts include the heat-affected zone, filler-metal selection for compatible low-alloy steels, and factors that can increase hydrogen-assisted cracking risk. Examination skills include interpreting radiographs, recognizing indications associated with porosity, and selecting a suitable method for surface-breaking cracks—for example, liquid penetrant testing on clean, nonporous, nonmagnetic stainless steel. Mechanical-test questions may ask how tensile fracture location informs evaluation of a welded joint and how ductile failure appears in a specimen. These concepts support practical tasks such as describing discontinuities accurately, considering likely causes of lack of fusion, and relating examination findings to weld integrity rather than treating each observation in isolation.
Sample Practice Questions
Review a selection from this exam's published US Practice Tests practice bank.
What is a common reason for selecting a low-alloy steel filler metal for a weld joining compatible low-alloy steel components?
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Correct answer: AFiller metal selection considers factors such as base-metal compatibility, required strength and toughness, service conditions, and applicable specifications. No filler metal guarantees immunity to all damage mechanisms or removes qualification requirements.
When examining a radiograph of a weld, which discontinuity is commonly associated with rounded or irregular isolated dark indications?
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Correct answer: AGas pores can appear as rounded dark indications on a radiograph because they represent areas of lower density than the surrounding metal. Shape and distribution should be interpreted using the applicable examination procedure and acceptance criteria.
In a steel weld, what is the purpose of a run-on tab when it is specified at the start of a weld?
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Correct answer: AA run-on tab lets the welder initiate the arc and establish stable welding conditions before the weld reaches the joint. It is commonly removed after welding, subject to the applicable requirements.
Which statement best describes the heat-affected zone (HAZ) of a fusion weld?
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Correct answer: BThe HAZ is base material adjacent to the weld that experienced a thermal cycle sufficient to alter its microstructure or properties without melting. The melted and resolidified region is weld metal.
Which feature is generally associated with a ductile tensile failure in a metal specimen?
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Correct answer: ADuctile failure is typically accompanied by appreciable plastic deformation before fracture, though the amount depends on material, temperature, and loading conditions. Brittle fracture generally shows much less macroscopic deformation.
A carbon steel weldment is being evaluated for hydrogen-assisted cracking risk. Which combination most generally increases that risk?
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Correct answer: BHydrogen-assisted cracking is promoted by the combined presence of diffusible hydrogen, a susceptible hard microstructure, and tensile stress or restraint. Controls commonly target one or more of these factors.
Which condition most commonly contributes to lack of fusion between a weld bead and the sidewall?
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Correct answer: ALack of fusion can result when energy or technique is insufficient to melt and fuse the sidewall, including poor electrode or torch positioning. Cleaning between passes is generally intended to reduce contamination rather than cause lack of fusion.
How to use this practice test
The free practice bank contains 50 published questions; each session presents up to 20 random questions. Use a session to check how well you interpret weld indications, metallurgy concepts, and test results. Review the results after submitting, then revisit any missed concept, such as HAZ behavior, cracking risk, or NDE method selection.
Preparation tips
- Compare radiographic appearances of porosity, cracks, and other weld indications; note which visual features support each interpretation.
- Trace how heat input and cooling affect the fusion zone and heat-affected zone, and connect those changes to cracking susceptibility.
- For hydrogen-assisted cracking scenarios, examine the combined roles of hydrogen, susceptible microstructure, and tensile stress rather than focusing on one factor.
- Match NDE methods to material and defect location; distinguish surface-breaking crack detection in nonmagnetic stainless steel from volumetric examination.
- For welded-joint tensile tests, relate fracture location and fracture appearance to what the result indicates about joint behavior.