An arc strike is characterized by which description?

• A. A deliberate arc to start welding.
• B. An unintended arc on the base metal surface causing a localized burn or damage.
• C. A normal arc during welding.
• D. A minor abrasion on the electrode.

Answer: (B)

Arc strike is an unintended arc that contacts or arcs into the base metal, causing a localized burn or heat damage on the surface. This is not part of the weld bead and typically appears as a burned, discolored spot or small crater separate from the weld. It results from starting or stopping the arc or accidental contact, rather than from the intentional welding process. In contrast, a normal welding arc creates the molten weld pool and bead, and initiating a deliberate arc to start welding is not the same as an arc strike. Prevention comes from proper starting technique, keeping the electrode from touching the work before the weld, and maintaining correct arc length and control during repositioning.