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

Low-hydrogen processes such as low-hydrogen SMAW electrodes or GTAW are preferred for pressure vessel repair to minimize hydrogen-induced cracking.

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

Magnetic Particle Testing (MT) is preferred for ferromagnetic materials because it detects both surface and near-surface discontinuities more reliably than PT.

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

Preheat requirements are primarily designed to slow the cooling rate and allow hydrogen to diffuse out, preventing hydrogen-induced cracking.

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

API 510 generally requires that repair welds on vessels that originally required PWHT also receive PWHT, unless an engineering alternative is documented and approved.

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

API 510 requires a documented repair plan or repair/alteration document to be prepared and approved by an Inspector before repair welding commences.

(API 510) API 510 Inspector Certification Practice Test

(API 510) API 510 Inspector Certification Practice Test

API 510 Welding Inspection 2