API 510 Welding Inspection 2

Question 1

According to API 510, which welding process is most commonly specified for pressure vessel repair welds due to its controllability and low hydrogen characteristics?

Accepted Answer

Low-hydrogen SMAW or GTAW

Answer

Shielded Metal Arc Welding (SMAW)

Answer

Gas Metal Arc Welding (GMAW)

Answer

Submerged Arc Welding (SAW)

Question 2

When inspecting a completed repair weld on a pressure vessel, which surface examination method is preferred for detecting surface-breaking cracks in ferromagnetic materials?

Accepted Answer

Magnetic Particle Testing (MT)

Answer

Liquid Penetrant Testing (PT)

Answer

Visual Testing (VT)

Answer

Eddy Current Testing (ET)

Question 3

Per API 510, what is the minimum preheat temperature requirement primarily intended to prevent in weld repairs?

Accepted Answer

Hydrogen-induced cracking

Answer

Oxidation of the weld metal

Answer

Porosity from moisture

Answer

Incomplete fusion

Question 4

A weld repair is made to a pressure vessel shell that originally required PWHT. Under API 510, what is generally required for the repair weld?

Accepted Answer

PWHT is required unless an alternative method is approved

Answer

PWHT is never required for repairs

Answer

PWHT is optional at the inspector's discretion

Answer

PWHT is only required if the repair exceeds 6 inches in length

Question 5

Which document must be prepared and approved BEFORE any welding repair work begins on a pressure vessel per API 510?

Accepted Answer

A Repair Plan or Repair/Alteration document

Answer

A Weld Map

Answer

A Material Test Report (MTR)

Answer

A Hydrostatic Test Procedure

Question 6

When reviewing a Welding Procedure Specification (WPS) for a pressure vessel repair, the inspector should verify that the WPS is supported by a qualified:

Accepted Answer

Procedure Qualification Record (PQR)

Answer

Welder Performance Qualification (WPQ) only

Answer

Mill Test Report (MTR)

Answer

Authorized Inspection Agency (AIA) approval letter

Question 7

During weld repair inspection, the inspector observes undercut along the toe of the weld. Per ASME Section VIII standards referenced by API 510, undercut is most concerning because it:

Accepted Answer

Creates a stress concentration that can initiate fatigue cracking

Answer

Indicates improper electrode angle only

Answer

Always requires immediate rejection regardless of depth

Answer

Only affects the cosmetic appearance of the weld