API 510 Welding Inspection 4

Question 1

Per API 510, a post weld heat treatment (PWHT) is performed to primarily achieve which metallurgical benefit in carbon steel welds?

Accepted Answer

Relieve residual stresses and improve toughness

Answer

PWHT in carbon steel welds primarily relieves residual welding stresses and improves the toughness and ductility of the heat-affected zone.

Question 2

An inspector reviewing NDE reports for a pressure vessel repair weld finds a linear indication reported by PT on the weld surface. Per acceptance criteria, linear indications are considered rejectable when they exceed:

Accepted Answer

1/4 inch (6 mm) in length

Answer

Per ASME Section VIII Division 1, linear indications detected by PT or MT exceeding 1/4 inch (6 mm) in length are rejectable.

Question 3

During weld repair inspection, an inspector observes a high-low (hi-lo) misalignment at a butt weld joint. Per API 510 and ASME VIII, excessive hi-lo is primarily a concern because it:

Accepted Answer

Creates local bending stresses and stress concentrations at the joint

Answer

Excessive hi-lo misalignment creates local bending stresses and a stress concentration at the weld that can significantly reduce the fatigue life of the joint.

Question 4

Which of the following is an essential variable for a SMAW welding procedure under ASME Section IX that would require procedure requalification if changed?

Accepted Answer

Changing the electrode classification (e.g., E7018 to E6010)

Answer

A change in electrode classification (filler metal F-Number or A-Number) is an essential variable under ASME IX that requires requalification because it changes the deposited weld metal chemistry and properties.

Question 5

When inspecting a weld on an austenitic stainless steel pressure vessel, which NDE surface method should NOT be used as the primary method due to masking concerns?

Accepted Answer

Magnetic Particle Testing (MT)

Answer

Austenitic stainless steel is non-ferromagnetic, making Magnetic Particle Testing (MT) ineffective and inappropriate for this material; PT or ET must be used instead.

(API 510) API 510 Inspector Certification Practice Test

(API 510) API 510 Inspector Certification Practice Test

API 510 Welding Inspection 4