Metallurgy Final Review Questions with

Metallurgy Final Review Questions with Complete Solutions (Latest 2025) In which physical state will the chemical reaction between metal atoms and foreign atoms be more rapid ?

• Solid
• Liquid
• Both "A" and "B" are equal - Correct Answers ✅B. Liquid

What is autogenous welding ?

• Oxyacetylene welding
• Sheet metal welding with the short circuiting mod of

GMAW

• Welding with no added filler metal - Correct Answers

✅C. Welding with no added filler metal What is shielding ?

• Shielding is thermal protection from the welding process.
• Shielding is protectioin from radioactivity present during

the welding process.

• Shielding is the technique of blanketing the welding area

with gases or fluxes which exclude harmful atmospheric chemicals. - Correct Answers ✅C. Shielding is the technique of blanketing the welding area with gases or fluxes which exclude harmful atmospheric chemicals. 1 / 3

Metallurgy Final Review Questions with Complete Solutions (Latest 2025) Which of the following would be considered shielding ?

• A neutral gas flame
• Flux
• A protective slag
• All of the above
• None of the above - Correct Answers ✅D. All of the

above What steels have the best weldability ?

• Steels with less than 0.20 percent carbon content
• Steels with about .040 percent carbon content
• Free machining steel with high led content - Correct

Answers ✅A. Steels with less than 0.20 percent carbon content What CE indicates the highest probability of underbead cracking ?

A. 0.20

B. 0.30

• 0.40 - Correct Answers ✅C. 0.40 2 / 3

Metallurgy Final Review Questions with Complete Solutions (Latest 2025) In what steels is it common to find grains of delta ferrite at room temperature ?

• Certain chromium-nickel stainless steels
• Fully austenitic stainless steels
• Ferritic straight chromium steels - Correct Answers ✅B.

Fully austenitic stainless steels A rectangular stainless steel tank is prepared using single pass welds to join a thin bottom sheet of unstabilized 18Cr/8Ni steel to four (4) side sheets made of Type 347 steel.Where will chromium carbide precipitation occur ? The welding electrode is E-308L with 0.03 max carbon.

• At grain boundaries in the weld metal.
• In heat-affected zone of bottom sheet at grain boundaries.
• In heat-affected zone of the Type 347 side sheets
• There should be no precipitation, because the electrode is

stabilized. - Correct Answers ✅B. In heat-affected zone of bottom sheet at grain boundaries.For welding purposes, how are protective oxide layers removed from aluminum and magnesium ?

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