What is the electrical property of SAW flux when cold?

• A. Non-conductive
• B. Conductive
• C. Superconductive
• D. Magnetic

Answer: (A)

SAW flux in its solid, or cold, state acts as an electrical insulator. That non-conductive behavior is important because it prevents leakage current through the flux layer and keeps the welding current focused along the intended arc path between the wire and the weld pool. When the flux melts, it becomes slag that can conduct enough current to complete the circuit and sustain the arc. If the flux were conductive when cold, current could bypass the arc, leading to unstable welding and poorer weld quality. Magnetic or superconductive properties aren’t relevant to how SAW flux behaves in the solid state.