What would be an acceptable shielding gas mixture of argon A

What would be an acceptable shielding gas mixture of argon (Ar) and oxygen (O) for GMA welds? Ar + 2% O_2 Ar + 1% O_2 Ar + 7% O_2 Ar + 0% O_2 What is the maximum frequency of porosity that is allowed for a visual inspection? 1 per inch (25 mm) 1 per 2 inches (50 mm) 1 per 3 inches (75 mm) 1 per 4 inches (100 mm) How can the weld bead be cleaned up? hand wire brush chipping hammer punch and hammer All of the above What GMAW process is used to make the welds on the 10 gauge to 14 gauge thick carbon steel joint GMAW-S GMAW-P GMAW-G GMAW-spray metal are transfer What shielding gas(s) are recommended for the FCA welding practices? 100% Ar 75% Ar + 25% CO_2 100% CO_2 25% Ar + 75% CO_2 What is the maximum incomplete fusion that is allowed for a visual inspection? 1/64 in (0.4 mm) 1/32 in (0.8 mm) 3/32 in. (2.4 mm) No incomplete fusion allowed What is the maximum crack size that is allowed for a visual inspection? 1/64 in (0.4 mm) 1/32 in (0.8 mm) 3/32

Solution

7. The acceptable shielding gas mixture of argon and oxygen for GMA welds would be Ar + 2% O₂.
ANSWER: a

8. The maximum frequency of porosity that is allowed for a visual inspection is 1 per 4 inches (100 mm).
ANSWER: d

9. The weld bead can be cleaned up using a hand wire brush.
ANSWER: a

10. The GMAW process is used to make the welds on the 10 gauge to 14 gauge thick carbon steel joint is GMAW-G.
ANSWER: c