Welding Inspection Flashcards
7 cards from real API 510 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Welding Inspection flashcards as text
According to API 510, which welding process is most commonly specified for pressure vessel repair welds due to its controllability and low hydrogen characteristics?
Answer: Low-hydrogen SMAW or GTAW
Low-hydrogen processes such as low-hydrogen SMAW electrodes or GTAW are preferred for pressure vessel repair to minimize hydrogen-induced cracking.
When inspecting a completed repair weld on a pressure vessel, which surface examination method is preferred for detecting surface-breaking cracks in ferromagnetic materials?
Answer: Magnetic Particle Testing (MT)
Magnetic Particle Testing (MT) is preferred for ferromagnetic materials because it detects both surface and near-surface discontinuities more reliably than PT.
Per API 510, what is the minimum preheat temperature requirement primarily intended to prevent in weld repairs?
Answer: Hydrogen-induced cracking
Preheat requirements are primarily designed to slow the cooling rate and allow hydrogen to diffuse out, preventing hydrogen-induced cracking.
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?
Answer: PWHT is required unless an alternative method is approved
API 510 generally requires that repair welds on vessels that originally required PWHT also receive PWHT, unless an engineering alternative is documented and approved.
Which document must be prepared and approved BEFORE any welding repair work begins on a pressure vessel per API 510?
Answer: A Repair Plan or Repair/Alteration document
API 510 requires a documented repair plan or repair/alteration document to be prepared and approved by an Inspector before repair welding commences.
When reviewing a Welding Procedure Specification (WPS) for a pressure vessel repair, the inspector should verify that the WPS is supported by a qualified:
Answer: Procedure Qualification Record (PQR)
A WPS must be supported by a Procedure Qualification Record (PQR) that documents the test results used to qualify the welding procedure.
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:
Answer: Creates a stress concentration that can initiate fatigue cracking
Undercut creates a mechanical notch at the weld toe that acts as a stress concentration point and can initiate fatigue cracks under cyclic loading.