Which of the following best describes arc blow?

Arc blow is best described as a phenomenon that causes the arc to deflect, which is accurately captured in the selected answer. This deflection occurs due to magnetic fields created by the flow of current through the workpiece and the welding circuit. These magnetic fields can disrupt the stability of the welding arc, leading to an erratic or wandering arc path that can affect the weld quality.

When arc blow occurs, the welder may experience difficulty in maintaining a steady arc length and direction, which can lead to inconsistent penetration and bead shape in the weld. Understanding arc blow is crucial for effective welding, as it enables the welder to adjust their technique or equipment, such as altering the position of the workpiece or using proper grounding techniques, to minimize its effects.

In contrast, the other options do not capture the essence of arc blow. Constant arc length pertains to maintaining a consistent distance between the electrode and the workpiece, which is a separate aspect of welding technique. Excessive shielding gas flow relates to gas metal arc welding rather than SMAW, where it may cause issues such as porosity or turbulence but not arc deflection. Lastly, improper electrode coating could lead to issues during the welding process, yet it does not define the behavior of the arc in