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

Increase the hardness of the heat-affected zone

Answer

Eliminate all weld discontinuities

Answer

Increase the tensile strength of the weld metal

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

3/16 inch (5 mm) in length

Answer

1/2 inch (13 mm) in length

Answer

Any linear indication is automatically 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

Makes radiographic interpretation more difficult

Answer

Requires automatic rejection of the joint

Answer

Only affects weld aesthetics and is not a structural concern

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

Changing the weld bead sequence

Answer

Changing the welding position from flat to horizontal

Answer

Changing the travel speed within the qualified range

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

Liquid Penetrant Testing (PT)

Answer

Visual Testing (VT)

Answer

Eddy Current Testing (ET)

Question 6

Per API 510, when welding repairs are made using temper bead welding technique, this technique is employed primarily to:

Accepted Answer

Provide post weld heat treatment in lieu of furnace PWHT by tempering the HAZ with subsequent weld beads

Answer

Eliminate the need for a qualified WPS

Answer

Allow unqualified welders to perform repairs

Answer

Replace radiographic testing requirements

Question 7

A repair weld on a pressure vessel is rejected due to an unacceptable indication found by RT. After excavation and re-welding, what is the minimum NDE requirement per API 510?

Accepted Answer

The same NDE method that found the original indication must be repeated on the repair weld

Answer

Visual inspection only is sufficient after re-weld

Answer

Only a pressure test is required after repair

Answer

MT is always required regardless of the original NDE method