API 510 Corrosion, Welding & Material Defects

Question 1

What is the primary cause of pitting corrosion in pressure vessels?

Accepted Answer

Localized breakdown of protective film

Answer

Uniform exposure to air.

Answer

Poor painting practices.

Answer

Excessive welding heat input.

Question 2

Which welding defect is characterized by the failure of fusion between the weld metal and base metal?

Accepted Answer

Lack of fusion

Answer

Porosity

Answer

Cracking

Answer

Undercut

Question 3

What is the typical cause of stress corrosion cracking (SCC)?

Accepted Answer

Tensile stress and corrosive environment

Answer

Excessive thickness

Answer

Low pressure

Answer

Inert atmosphere

Question 4

Which material defect can be detected by radiographic testing?

Accepted Answer

Slag inclusion

Answer

Surface porosity

Answer

Paint thickness

Answer

Coating defects

Question 5

Which welding method is most prone to causing hot cracking?

Accepted Answer

Gas welding

Answer

Cold welding

Answer

Friction stir welding

Answer

Laser welding

Question 6

What type of corrosion affects the grain boundaries of a material?

Accepted Answer

Intergranular corrosion

Answer

Uniform corrosion

Answer

Galvanic corrosion

Answer

Crevice corrosion

Question 7

Which defect is identified by a sharp groove at the weld toe?

Accepted Answer

Undercut

Answer

Overlap

Answer

Porosity

Answer

Spatter

Question 8

What is the best inspection method to detect surface cracks in welds?

Accepted Answer

Liquid penetrant testing

Answer

Ultrasonic testing

Answer

Radiographic testing

Answer

Visual testing

Question 9

Which condition can lead to hydrogen-induced cracking (HIC)?

Accepted Answer

Presence of hydrogen and stress

Answer

High temperature exposure

Answer

Lack of cooling

Answer

Neutral pH environment