What is the definition of "arc length" in MIG welding?

Arc length in MIG welding refers to the distance from the tip of the contact electrode to the surface of the workpiece. This measurement is crucial because it directly affects the stability of the welding arc and the quality of the weld being produced. A proper arc length ensures that the arc remains consistent, resulting in optimal heat input and penetration into the base metal. If the arc length is too short, it can lead to excessive spatter and potential short circuits. Conversely, if it is too long, it may result in insufficient heat, poor penetration, and an unstable arc.

Understanding arc length is essential for achieving high-quality welds while ensuring safe and efficient operation of the MIG welding process. Proper arc length adjustment can lead to cleaner and stronger welds, contributing to the overall integrity of the fabrication work.