AWS Welding Metallurgy & Materials

Question 1

What is the heat-affected zone (HAZ) in welding?

Accepted Answer

Area of base metal altered by heat

Answer

Portion of the weld metal

Answer

Edge of the filler metal

Answer

Surface of the weld bead

Question 2

Which metal is most prone to hydrogen-induced cracking during welding?

Accepted Answer

High-strength steel

Answer

Aluminum

Answer

Copper

Answer

Stainless steel

Question 3

What is the function of preheating in welding?

Accepted Answer

Minimizes risk of cracking

Answer

Speeds up deposition rate

Answer

Improves surface finish

Answer

Increases arc voltage

Question 4

What type of stainless steel is most commonly used in welding applications?

Accepted Answer

Austenitic

Answer

Ferritic

Answer

Martensitic

Answer

Duplex

Question 5

Which welding defect is typically caused by contamination or improper shielding gas?

Accepted Answer

Porosity

Answer

Undercut

Answer

Incomplete fusion

Answer

Crater crack

Question 6

Which material requires special attention due to high thermal conductivity and oxidation potential during welding?

Accepted Answer

Aluminum

Answer

Steel

Answer

Titanium

Answer

Brass