AWS Welding Inspection, Testing & Quality Control 5

Question 1

What does 'interpass temperature' refer to in a multi-pass weld?

Accepted Answer

The maximum temperature of the weld and adjacent base metal before depositing the next pass

Answer

Interpass temperature is the temperature of the weld joint immediately before depositing a subsequent weld pass, and controlling it prevents overheating or excessive cooling.

Question 2

Which weld discontinuity is most commonly associated with improper shielding gas coverage during GMAW?

Accepted Answer

Porosity

Answer

Inadequate or contaminated shielding gas allows atmospheric oxygen and nitrogen to enter the weld pool, causing porosity in GMAW welds.

Question 3

What is the significance of the 'essential variable' concept in welding procedure qualification?

Accepted Answer

A change to an essential variable requires requalification of the welding procedure

Answer

Essential variables are those parameters that, if changed beyond specified limits, significantly affect the mechanical properties or soundness of the weld, requiring procedure requalification.

Question 4

Which destructive test method is used to evaluate the hardness distribution across a weld cross-section, including the HAZ?

Accepted Answer

Vickers or Rockwell hardness traverse

Answer

A hardness traverse using Vickers or Rockwell indentation tests is performed across a weld cross-section to map hardness variations in the weld metal, fusion zone, HAZ, and base metal.

Question 5

In radiographic testing, what is the purpose of a penetrameter (IQI – Image Quality Indicator)?

Accepted Answer

To verify that the radiograph has sufficient sensitivity to detect relevant discontinuities

Answer

An IQI (penetrameter) is placed on the object during radiography to verify the technique achieves the required image sensitivity; if the IQI image is visible, the technique can detect similarly sized features.

AWS Practice Test

AWS Practice Test

AWS Welding Inspection, Testing & Quality Control 5