CWI Ultimate Review 3

Question 1

Which AWS document governs the structural welding of steel for buildings and bridges?

Accepted Answer

AWS D1.1

Answer

AWS D1.1, the Structural Welding Code—Steel, is the governing document for structural steel welding in buildings and bridges.

Question 2

A Charpy V-notch (CVN) impact test measures a material's:

Accepted Answer

Toughness (notch toughness)

Answer

The Charpy V-notch test measures the energy absorbed during fracture, which is a measure of the material's toughness or notch toughness.

Question 3

On a welding symbol, a flag attached to the reference line indicates:

Accepted Answer

A field weld

Answer

A flag on the reference line of a welding symbol indicates the weld is to be made in the field (on-site) rather than in the shop.

Question 4

What is 'hydrogen-induced cracking' (HIC) most commonly associated with in welding?

Accepted Answer

High-strength low-alloy steel welded without adequate preheat

Answer

HIC (also called cold cracking or delayed cracking) is most commonly associated with high-strength steels where hydrogen absorbed during welding causes cracking, especially without adequate preheat.

Question 5

In ultrasonic testing (UT), what does the term 'dead zone' refer to?

Accepted Answer

The region immediately below the test surface where defects cannot be detected due to the initial pulse

Answer

The dead zone is the region immediately beneath the transducer face where defects cannot be detected because of the initial transmit pulse interfering with the return signal.

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CWI Ultimate Review 3