![]() ![]() | 150 | 3Ħ to 8 inches from arc or torch. The rates of ventilation required to accomplish this control velocity using a 3-inch (7.6 cm) wide flanged suction opening are shown in the following table: Freely movable hoods intended to be placed by the welder as near as practicable to the work being welded and provided with a rate of air-flow sufficient to maintain a velocity in the direction of the hood of 100 linear feet (30 m) per minute in the zone of welding when the hood is at its most remote distance from the point of welding. High yellow light, it is desirable to use a filter or lens thatĪbsorbs the yellow or sodium line in the visible light of the NOTE: In gas welding or oxygen cutting where the torch produces a ![]() Gas welding (medium) 1/8 inch to 1/2 inch. These recommendations may be varied to suit the individual's needs. The following is a guide for the selection of the proper shade numbers.
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