API Welding Inspection And Metallurgy - API-577 Exam Questions [2026]

QUESTION NO: 1
The WPS gives the welder specific guidelines to:

A. Set the machine amperage, voltage, and travel speed. B. Confirm the project heat input is followed during welding. C. Successfully complete production welds. D. Make imperfection/defect-free welds.

Correct Answer: A

QUESTION NO: 2
The carbon equivalent formula indicates:

A. The weldability of a steel, based on carbon content. B. The theoretical carbon content of a steel. C. Whether postweld heat treatment (PWHT) will be needed. D. Whether preheat will be needed.

Correct Answer: A

QUESTION NO: 3
As a result of welding, metals with a high coefficient of thermal expansion are:

A. Less susceptible to cracking during welding. B. More susceptible to distortion during welding. C. Less susceptible to brittle fracture. D. More susceptible to brittle fracture.

Correct Answer: B

QUESTION NO: 4
For GMAW welding, the last number of the electrode identifies the:

A. Coating characteristics. B. Operating characteristics. C. Strength of the electrode. D. Chemical composition.

Correct Answer: B

QUESTION NO: 5
What is the "area of interest" on a weld radiograph?

A. The specific portion of a radiograph that needs to be evaluated B. The entire radiograph minus 2 in. (50.8 mm) from the edges C. Only the area of contrasting density D. The portion that is less than 3t from the center of the radiograph, where t is the thickness of the weld

Correct Answer: A

QUESTION NO: 6
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. 0.30% B. 0.35% C. 0.42% D. 0.48%

Correct Answer: C

QUESTION NO: 7
To avoid burn through during in-service welding on thinner wall equipment, it is generally recommended to:

A. Use high heat input. B. Use larger diameter electrodes. C. Maximize weaving the bead. D. Minimize weaving the bead.

Correct Answer: D