Multiple Choice Question (MCQ)
Question: Which combination of shield gas in GMAW process produce good arc stability for carbon steel?
A.
Argon + 20% CO<sub>2</sub>
B.
CO<sub>2</sub>
C.
Pure argon
D.
Argon + 5% CO<sub>2</sub>
Correct Answer: Argon + 5% CO<sub>2</sub>