Which fumes are particularly associated with stainless steel welding, and why is it important?

• A. Ozone produced by UV light exposure.
• B. Hexavalent chromium and nickel fumes; cancer risk; require control measures.
• C. Copper fumes.
• D. No hazard.

Answer: (B)

When stainless steel is welded, the heat releases fumes that contain chromium and nickel oxides. The hexavalent form of chromium (Cr(VI)) is particularly toxic and has a well-established cancer risk for inhalation exposure, while nickel compounds can also irritate and pose health hazards. Because of these serious risks, welding stainless requires controls to limit worker exposure, such as fume extraction at the source, local exhaust ventilation, proper enclosure or barriers, and appropriate respiratory protection when needed, along with air monitoring and safe working practices. The other options don’t reflect the specific hazards of stainless steel welding—ozone from UV light isn’t the primary welding fume hazard here, copper fumes pertain to copper alloys, and claiming there’s no hazard ignores the real carcinogenic risks associated with Cr(VI) and nickel fumes.