What is "arc blow" and how can it be mitigated?

Arc blow is a phenomenon in welding characterized by an erratic or unstable arc that occurs primarily due to the effects of magnetic fields generated by the welding current. This instability can cause the arc to wander away from the desired area on the workpiece, making it difficult to achieve a consistent weld. The erratic behavior of the arc can result in uneven bead appearance and potential defects in the weld.

Mitigation strategies for arc blow often involve adjusting the position of the workpiece. By repositioning the workpiece, the impact of the magnetic fields on the arc path can be minimized. Additional techniques might include altering the orientation of the ground clamp or using alternating current (AC) instead of direct current (DC) to help counteract the influence of the magnetic fields.

In contrast, the alternatives do not accurately describe the cause or resolution of arc blow. For instance, it is not primarily related to filler material quality, nor is it a type of welding defect that requires cooling. Therefore, understanding the nature of arc blow and the appropriate adjustments is crucial for effective Gas Tungsten Arc Welding practices.