Question

the addition of helium to a gmaw arc will ______ the arc power. not affect decrease increase

Explanation:

Helium has a high thermal conductivity and ionization potential. When added to the shielding gas in GMAW (Gas Metal Arc Welding), it increases the arc voltage for a given current. Since arc power is calculated as \(P = VI\) (where \(V\) is voltage and \(I\) is current), an increase in voltage (with current remaining relatively constant or adjusted within normal welding parameter ranges) leads to an increase in arc power.

Answer:

C. Increase