CWI Fundamentals 2

Question 1

Which welding process uses a non-consumable tungsten electrode and a separate filler metal?

Accepted Answer

GTAW

Answer

GMAW

Answer

SMAW

Answer

FCAW

Question 2

What does the term 'heat-affected zone' (HAZ) refer to in welding?

Accepted Answer

The base metal area altered by heat but not melted

Answer

The molten weld pool during welding

Answer

The flux coating on a SMAW electrode

Answer

The shielding gas envelope around the arc

Question 3

A CWI discovers a crack running along the centerline of a weld bead. This defect is most likely caused by:

Accepted Answer

High sulfur or phosphorus content in the base metal

Answer

Excessive preheat temperature

Answer

Insufficient arc voltage

Answer

Excessive shielding gas flow rate

Question 4

According to AWS D1.1, what is the minimum preheat temperature for welding 1-inch thick ASTM A36 steel when the ambient temperature is above 32°F?

Accepted Answer

No preheat required

Answer

150°F (65°C)

Answer

200°F (93°C)

Answer

300°F (149°C)

Question 5

Which discontinuity is characterized by fusion that does not extend to the full cross-section of the joint as specified?

Accepted Answer

Incomplete joint penetration

Answer

Porosity

Answer

Undercut

Answer

Overlap

Question 6

What is the purpose of a preheat when welding high-carbon or alloy steels?

Accepted Answer

Reduce the risk of hydrogen-induced cracking

Answer

Increase travel speed

Answer

Increase penetration depth

Answer

Remove mill scale before welding

Question 7

When visually inspecting a completed groove weld, the inspector should verify the weld face reinforcement does NOT exceed:

Accepted Answer

The limit specified in the applicable code or standard

Answer

1/16 inch for all thicknesses

Answer

3/16 inch regardless of plate thickness

Answer

1/4 inch for plates thicker than 1 inch