Which of the following is a common source of fumes while welding?

• A. Aluminum
• B. Platinum
• C. Zinc
• D. Nickel

Answer: (B)

Fumes during welding come from the metal and any coatings that vaporize when heated. Zinc is a very common source because many steels are galvanized with zinc to prevent corrosion. When you weld galvanized steel, the zinc coating tends to vaporize and form zinc oxide fumes in the welding plume. These fumes can irritate the respiratory system and, with enough exposure, cause metal fume fever, so controlling exposure is important.

Compared with the other metals listed, zinc coatings are the typical source of fumes in everyday welding scenarios. Aluminum can produce fumes from aluminum oxide and other compounds when welding aluminum, but zinc from galvanizing is the more common source in general welding work. Nickel fumes occur mainly with nickel-containing alloys, and platinum is not a common welding coating or filler that creates fumes in standard practice. To reduce exposure, use local exhaust ventilation or a fume extractor, wear an appropriate respirator if ventilation is limited, and remove zinc coatings before welding if possible.