OHST Practice Exam

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What hazardous metal fume can be encountered when welding stainless steel?

Hexavalent chromium
Lead chromate
Zinc oxide
Magnesium oxide

The correct answer is: Hexavalent chromium

Welding stainless steel can produce hazardous metal fumes, with hexavalent chromium being a significant concern. When stainless steel is welded, particularly those grades that contain chromium, the high temperatures can vaporize the chromium present in the metal, which then combines with oxygen to form hexavalent chromium compounds. These compounds are known to be highly toxic and can lead to serious health issues, including respiratory problems, skin irritation, and increased cancer risk. Hexavalent chromium is classified as a known carcinogen, and exposure in occupational settings can occur through inhalation of vapors or dust produced during the welding process. This underscores the importance of adequate ventilation, personal protective equipment, and monitoring exposure levels in welding environments. The other options listed, while they represent hazardous materials in different contexts, are not directly associated with the fume produced specifically during the welding of stainless steel. Understanding the risks associated with hexavalent chromium is critical for ensuring safety in welding operations involving stainless steel.