With ____, penetration and bead profile are sensitive to arc length, and the long arcs needed for feeding filler wires are more difficult to control.
A) helium
B) nitrogen
C) hydrogen
D) argon

Question

Quizplus · Accepted Answer

Helium is known for its sensitivity to arc length, which affects penetration and bead profile. Its arc characteristics make controlling long arcs, necessary for feeding filler wires, more challenging compared to other shielding gases like argon.

With ____, Penetration and Bead Profile Are Sensitive to Arc