What is meant by arc strike in welding terms?

In welding terminology, arc strike refers to a localized remelted area or a change in the surface caused by an arc. This phenomenon occurs when the welding electrode makes contact with the base material or when the arc is improperly initiated or maintained, leading to an unintended melting of the base material. The remelted metal may display characteristics such as altered grain structure, which can impact the mechanical properties of the weld and the base material itself.

Understanding this concept is crucial for welders and inspectors alike, as arc strikes can contribute to defects such as improper heat affected zones or loss of structural integrity, ultimately affecting the performance of the welded joint. Recognizing and controlling this aspect in welding practice can help improve the quality and reliability of welds.