GMAW NC II Practice Questions - TESDA Gas Metal Arc Welding (GMAW) NC II Competency Assessment Exam

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In carbon steel pipe GMAW, which shielding gas mixture is most commonly specified for balanced arc stability and penetration?

75% argon / 25% CO₂ (C-25) 100% oxygen 100% acetylene 50% nitrogen / 50% helium

Correct Answer:

75% argon / 25% CO₂ (C-25)

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