Welder Red Seal · Question
A welder is setting up for shielded metal arc welding (SMAW) on carbon steel. The shop ventilation system is a general dilution type. Which of the following statements best describes the appropriate respiratory protection for this task?
SMAW of carbon steel produces fine particulate fumes containing various metal oxides. General dilution ventilation alone is often insufficient, and an N95 respi
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Question: A welder is setting up for shielded metal arc welding (SMAW) on carbon steel. The shop ventilation system is a general dilution type. Which of the following statements best describes the appropriate respiratory protection for this task?
Answer options:
- A disposable N95 particulate respirator is sufficient.
- No respiratory protection is necessary if general ventilation is present.
- A supplied-air respirator is always required for SMAW. ✅ A particulate respirator with P100 (HEPA) filters is generally recommended.
Correct answer: A particulate respirator with P100 (HEPA) filters is generally recommended.
Explanation: SMAW of carbon steel produces fine particulate fumes containing various metal oxides. General dilution ventilation alone is often insufficient, and an N95 respirator might not capture enough of the fine particles. A P100 (HEPA) particulate respirator offers high-efficiency filtration suitable for welding fumes in conditions where a supplied-air respirator isn't mandated, providing a higher level of protection than an N95. Supplied-air respirators are reserved for more hazardous environments or materials.
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