Hazards like asphyxiation from welding gases happen in a matter of:

• A. Seconds
• B. Minutes
• C. Hours
• D. Days

Answer: (B)

Asphyxiation hazards from welding gases arise quickly because shielding and other inert gases can rapidly dilute or replace the breathable air in a space. In a confined or poorly ventilated area, the atmosphere can become oxygen-deficient in minutes as gas displaces oxygen. That makes minutes the most realistic timeframe for danger to develop, not seconds (which would require an instantaneous, massive leak) and not hours or days (the air would be unsafe far sooner). To stay safe, ensure adequate ventilation, use local exhaust, and monitor the atmosphere for oxygen levels.