Unfused flux after solidification is handled how in SAW?

• A. Reclaimed with a vacuum system for reuse.
• B. Discharged as solid waste.
• C. Remains fused in the slag.
• D. Melted into the weld metal.

Answer: (A)

In SAW, flux not only protects the weld and supplies alloying elements, but some of it may remain unfused after the weld cools. That unfused flux is collected and reclaimed with a vacuum system so it can be reused in future welds. The vacuum system pulls the spent flux away from the weld area, separates it from the slag, and returns it to the flux supply (or reconditions it for reuse). This approach minimizes waste and keeps flux chemistry consistent. Discharging as solid waste would waste material; flux left in slag is not easily recoverable; and having flux melt into the weld metal would contaminate the weld.