What is the minimum air velocity required at the welding arc for effective ventilation?

The minimum air velocity at the welding arc for effective ventilation is important to ensure that harmful fumes and gases generated during welding are adequately dissipated. A velocity of 100 feet per minute (fpm) is recognized as the standard minimum because it helps to carry away pollutants before they can be inhaled by the welder or anyone in the vicinity.

Effective ventilation is critical not only for the safety and health of the workers but also for maintaining a safe working environment that complies with occupational health standards. This rate is sufficient to create a localized airflow that effectively captures and removes the hazardous smoke and fumes produced during the welding process, thus minimizing exposure to toxic materials.

The options that provide lower air velocities are not adequate for ensuring safety. A minimum air velocity of 100 fpm balances the need for efficient ventilation while also considering practical aspects of welding operations, making it the recommended minimum standard in the industry.