NDT Weld Inspection & Evaluation 3

Question 1

During weld inspection, 'heat-affected zone (HAZ) cracking' most commonly occurs due to which condition?

Accepted Answer

High hydrogen content and rapid cooling of hardenable base metals

Answer

Excessive weld reinforcement height

Answer

Insufficient arc voltage during welding

Answer

Incorrect travel speed causing underfill

Question 2

What is the theoretical throat of a flat-faced fillet weld with a 1/2-inch leg size?

Accepted Answer

0.354 inch

Answer

0.250 inch

Answer

0.500 inch

Answer

0.707 inch

Question 3

Which AWS code governs the structural welding of steel for pressure vessels and boiler applications inspected under NDT boilermaker standards?

Accepted Answer

ASME Section VIII Division 1

Answer

AWS D1.1 Structural Welding Code — Steel

Answer

API 650 Standard for Welded Tanks

Answer

AWS D1.6 Structural Welding — Stainless Steel

Question 4

What type of weld discontinuity is described as a groove melted into the base metal adjacent to the weld toe?

Accepted Answer

Undercut

Answer

Overlap

Answer

Porosity

Answer

Cold lap

Question 5

When visually inspecting a weld for surface porosity, an inspector finds pits on the weld face that break the surface. Under ASME Section VIII, this condition is:

Accepted Answer

Rejectable because surface porosity indicates potential internal porosity and incomplete fusion

Answer

Acceptable if individual pits are smaller than 1/8 inch diameter

Answer

Acceptable provided the weld meets minimum size requirements

Answer

Acceptable only for non-pressure-retaining welds

Question 6

A weld is made with E7018 electrodes on A36 base metal. What does the '70' in E7018 designate?

Accepted Answer

Minimum tensile strength of 70,000 psi for the deposited weld metal

Answer

Maximum amperage setting of 70 amps for the electrode

Answer

Welding position number 70 per AWS classification

Answer

Flux coating thickness of 70 mils

Question 7

What does the term 'weld discontinuity' mean compared to the term 'weld defect'?

Accepted Answer

A discontinuity is any interruption in the weld structure; a defect is a discontinuity that exceeds acceptance criteria

Answer

They are interchangeable terms meaning the same thing

Answer

A defect is always smaller than a discontinuity

Answer

A discontinuity only refers to surface imperfections while a defect is internal