AWS Welding Defects & Quality Control

Question 1

Which NDE method is best suited for detecting surface and near-surface cracks in ferromagnetic welds?

Accepted Answer

Magnetic particle testing (MT)

Answer

Radiographic testing (RT)

Answer

Ultrasonic testing (UT)

Answer

Visual testing (VT)

Question 2

Liquid penetrant testing (PT) is applicable to:

Accepted Answer

Any material — ferromagnetic and non-ferromagnetic alike

Answer

Ferromagnetic materials only

Answer

High-temperature components only

Answer

Subsurface defects only

Question 3

Lack of fusion (LOF) in a groove weld is best detected by:

Accepted Answer

Ultrasonic testing (UT)

Answer

Visual testing alone

Answer

Radiographic testing (RT)

Answer

Magnetic particle testing (MT)

Question 4

Lamellar tearing in welded joints occurs:

Accepted Answer

In the base metal below the HAZ in low-ductility, through-thickness directions of rolled plate

Answer

In the weld metal along the centerline due to solidification shrinkage

Answer

At the weld face due to excessive restraint

Answer

Between weld passes due to slag inclusions

Question 5

What does 'Charpy V-notch' (CVN) impact testing measure in weld procedure qualification?

Accepted Answer

The fracture toughness (energy absorbed during fracture) at specified temperatures

Answer

The maximum hardness of the weld HAZ

Answer

The fatigue life of the weld joint

Answer

The diffusible hydrogen content of the weld deposit

Question 6

A weld that fails the guided bend test during procedure qualification typically indicates:

Accepted Answer

Lack of fusion, excessive porosity, or cracking in the weld joint

Answer

The electrode was the wrong size

Answer

The preheat was too high

Answer

The test was performed incorrectly — bend tests rarely fail qualified procedures