Once welding is completed and the mold has cooled, which action is recommended?

• A. Polish the mold exterior for aesthetics.
• B. Check the mold alignment with the tool.
• C. Apply a sealant to the mold seam.
• D. Clean the inside of the mold with a soft bristle brush or soft cotton cloth.

Answer: (D)

Cleaning the interior after welding and cooling is essential so the next casting cycle starts with a clean, unobstructed surface. Debris like slag, oxide, or residues inside the mold can cause defects in the part and wear on the mold if not removed.

Using a soft bristle brush or a soft cotton cloth is ideal because it effectively lifts and removes debris without scratching or dulling the mold’s interior finish, preserving its precision and smooth release characteristics.

Polishing the exterior doesn’t impact the molding process, and checking alignment or applying a sealant to the seam aren’t the immediate post-weld steps. Alignment checks are typically part of setup or maintenance, and sealants are not used right after welding because they can trap contaminants or interfere with future cycles.