What is used for welding in inert gas metal arc welding?

Q.  In inert gas metal arc welding,
- Published on 04 Sep 15

a. Argon is used for welding thin materials and helium is used for welding thick materials
b. Both argon and helium are used for welding thin materials
c. Both argon and helium are used for welding thick materials
d. Argon is used for welding thick materials and helium is used for welding thin materials

ANSWER: Argon is used for welding thin materials and helium is used for welding thick materials

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