Which current type reduces arc blow in SMAW?

• A. Direct current (DC)
• B. Pulsed current
• C. Alternating current (AC)
• D. Constant current (CC)

Answer: (D)

Arc blow happens when the magnetic field around the welding current pushes the arc sideways, causing it to wander and deflect away from the joint. Keeping the current steady, i.e., using constant current, stabilizes the magnetic field around the arc. With a stable field, the forces acting on the arc stay more uniform, making the arc easier to control and less prone to drifting along the weld. Pulsed or alternating current introduces changing magnetic forces as the current or polarity fluctuates, which can cause the arc to wander more in some setups. In SMAW practice, a steady, constant current helps maintain a stable arc and bead, which is why it’s viewed as reducing arc blow in this context.