[2025] Pass API-577 Exam - Real Questions and Answers
API-577 Exam Questions Get Updated [2025] with Correct Answers
NEW QUESTION # 51
A-number groupings are based upon the:
- A. Type and strength of base metal.
- B. Chemical composition of the deposited weld metal.
- C. Weldability characteristics of the metal.
- D. Comparable base metal ultimate strength values.
Answer: B
NEW QUESTION # 52
What is a discontinuity?
- A. A departure of a quality characteristic from its intended condition.
- B. The response or evidence from the application of NDE.
- C. An interruption in the normal physical structure of a material.
- D. An imperfection which is detectable with NDE.
Answer: C
NEW QUESTION # 53
Rules for qualifying welding operators using radiography on a production weld require what minimum weld length to be examined?
- A. 6 in. (150 mm)
- B. 24 in.(600 mm)
- C. 12 in. (300 mm)
- D. 36 in. (900 mm)
Answer: C
NEW QUESTION # 54
API Recommended Practice 577 provides:
- A. A definition of specific techniques and practices that should be used for welding inspection.
- B. Guidance on welding inspection during the fabrication and repairing of refinery equipment and piping.
- C. Guidance on the extent and scope of inspection required for specific types of welds.
- D. A definition of welds that should be inspected in refinery and chemical plant equipment.
Answer: B
NEW QUESTION # 55
One of the main differences between welding nickel alloys and austenitic stainless steels is that with nickel alloys:
- A. The weld pool tends to be sluggish.
- B. Interpass temperature control is not needed.
- C. There is less susceptibility to cracking from contaminants.
- D. There is less susceptibility to lack of fusion.
Answer: A
NEW QUESTION # 56
How much should each pass of the transducer overlap the previous path during a weld scan?
- A. 20% of the transducer element dimension.
- B. 15% of the transducer element dimension.
- C. 10% of the transducer element dimension.
- D. 5% of the transducer element dimension.
Answer: C
NEW QUESTION # 57
To reduce the possibility of cracking, which of the following maximum hardness levels is required for weldments in wet H2S service?
- A. HRC 25
- B. HRC 22
- C. HRC 32
- D. HRC 20
Answer: B
NEW QUESTION # 58
P-numbers are based on which of the following?
- A. Chemical composition of the base metal
- B. Comparable base metal characteristics
- C. Electrode characteristics
- D. Weldability characteristics of base metal
Answer: D
NEW QUESTION # 59
What is the major cause of lack of fusion in all welding processes involving carbon steel?
- A. Improper heat input and improper welding technique
- B. Not using a low hydrogen electrode or improper shielding
- C. Inadequate preheat
- D. Improper welding speed
Answer: A
NEW QUESTION # 60
Stud arc welding is a specialized process predominantly limited to welding:
- A. Flat position welds.
- B. Non-pressure-containing welds.
- C. Insulation and refractory pins.
- D. Non-load-bearing welds.
Answer: C
NEW QUESTION # 61
When welding using the GTAW process, which of the following best describes the appearance of a transverse crack on a radiograph?
- A. A feathery line of longitudinal orientation located at the center of the weld image.
- B. An irregular darker line near the center of the width of the weld image along the edge of the root pass image.
- C. Elongated lines of darker density, irregular in width, and slightly winding in the lengthwise direction.
- D. A feathery, twisted line of darker density running across the width of the weld.
Answer: D
NEW QUESTION # 62
For hot tap and in-service welding, above what carbon equivalent limit is it recommended to use extra low hydrogen electrodes to weld carbon steels?
- A. 0.42%
- B. 0.30%
- C. 0.48%
- D. 0.35%
Answer: A
NEW QUESTION # 63
Which of the following is a hazard associated with in-service welding on a carbon steel pipe containing chlorine?
- A. Carbon steel will burn in the presence of chlorine and high heat.
- B. Exothermic decomposition or explosion.
- C. Explosion or unstable reaction with the addition of localized heat.
- D. Hydrogen released during welding process can initiate hydrogen-assisted cracking.
Answer: C
NEW QUESTION # 64
What is the "area of interest" on a weld radiograph?
- A. The entire radiograph minus 2 in. (50.8 mm) from the edges
- B. The portion that is less than 3t from the center of the radiograph, where t is the thickness of the weld
- C. The specific portion of a radiograph that needs to be evaluated
- D. Only the area of contrasting density
Answer: C
NEW QUESTION # 65
A crack with its major axis oriented approximately perpendicular to the weld axis is called a:
- A. Lamellar crack.
- B. Perpendicular crack.
- C. Transverse crack.
- D. Non-directional crack.
Answer: C
NEW QUESTION # 66
Eddy current can be used to measure the:
- A. Holidays in coatings or claddings.
- B. Thickness of surface coatings or cladding thickness.
- C. Thickness of parent metal below alloy metal claddings.
- D. Extent of bonding of coatings or claddings.
Answer: B
NEW QUESTION # 67
What is a sensitized microstructure in austenitic stainless steels?
- A. An area next to the heat-affected zone that has suffered some softening and loss of strength.
- B. An area near the heat-affected zone affected by welding that may experience intergranular corrosion.
- C. The high residual stress zone adjacent to the weld fusion line that will have higher hardness than the weld or base material.
- D. The microstructure of the weld that has been melted and will therefore have properties more like a casting than the base metal.
Answer: B
NEW QUESTION # 68
Which of the following weld flaws is described as a subsurface terrace and step-like crack weakened by dispersed planar-shaped inclusions?
- A. Hydrogen cracking
- B. Sulfite stringers
- C. Hot cracking
- D. Lamellar tearing
Answer: D
NEW QUESTION # 69
The distance the weld metal extends from the weld face into a joint, exclusive of weld reinforcement is called:
- A. Complete penetration
- B. Groove angle
- C. The weld body
- D. Joint penetration
Answer: D
NEW QUESTION # 70
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