Which defect is associated with tenacious surface oxide films on certain metals?

Which defect is associated with tenacious surface oxide films on certain metals?

• A. Porosity
• B. Slag inclusions
• C. Oxide inclusions
• D. Cracks

Answer: (C)

Tenacious surface oxide films on metals can be carried into the molten weld pool and become embedded as it solidifies. These oxide fragments form oxide inclusions—nonmetallic oxide particles lodged in the weld metal that weaken the joint. Porosity would be gas pockets, slag inclusions come from slag material trapped in the weld, and cracks are actual fractures from stress or improper cooling. The stubborn oxide films specifically lead to oxide inclusions, making it the best fit for this defect.

Tenacious surface oxide films on metals can be carried into the molten weld pool and become embedded as it solidifies. These oxide fragments form oxide inclusions—nonmetallic oxide particles lodged in the weld metal that weaken the joint. Porosity would be gas pockets, slag inclusions come from slag material trapped in the weld, and cracks are actual fractures from stress or improper cooling. The stubborn oxide films specifically lead to oxide inclusions, making it the best fit for this defect.