The term "arc blow" refers to which phenomenon?

Arc blow is a phenomenon that primarily refers to the deflection of the welding arc due to magnetic forces. This occurs particularly in welding applications involving direct current (DC), where the arc can be influenced by magnetic fields created by the flow of electrical current through the workpiece or nearby magnetic materials. When the arc is displaced, it can lead to challenges in achieving proper weld penetration and bead profile, affecting the overall quality of the weld.

The understanding of arc blow is critical for welders and inspectors as they need to minimize its effects to maintain consistent and high-quality welds. Management strategies for arc blow may involve changing the welding position, adjusting the work lead path, or altering the amperage to help center the arc and stabilize the welding process.