Welder Red Seal · Question
A welder is performing aluminum TIG welding in an enclosed shop. They are using a local exhaust ventilation system (LEV) to control fumes. What is the recommended minimum capture velocity at the source for effective fume removal?
According to industrial hygiene guidelines (e.g., ACGIH Industrial Ventilation Manual), a capture velocity of at least 0.1 m/s (10 m/min or 20 fpm) is generally
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Question: A welder is performing aluminum TIG welding in an enclosed shop. They are using a local exhaust ventilation system (LEV) to control fumes. What is the recommended minimum capture velocity at the source for effective fume removal?
Answer options: ✅ 0.1 m/s
- 0.5 m/s
- 1.0 m/s
- 2.5 m/s
Correct answer: 0.1 m/s
Explanation: According to industrial hygiene guidelines (e.g., ACGIH Industrial Ventilation Manual), a capture velocity of at least 0.1 m/s (10 m/min or 20 fpm) is generally considered the minimum effective rate for controlling welding fumes at the source. Lower velocities may not adequately capture the fumes, while significantly higher velocities might not always be necessary or practical for TIG welding without disturbing the shielding gas.
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