AWS F3.1 : 1989

Personnel
Foreword
1. Scope
2. Welding Fume Hazards
2.1 Types of Contaminants
2.2 Overexposures
3. General and Dilution Ventilation
3.1 General Ventilation
3.2 Dilution Ventilation
4. Local Exhaust Ventilation Control
4.1 General
4.2 Equipment
5. Local Exhaust Ventilation Design Procedure
5.1 Procedure and Phases
5.2 Exhaust Subsystems
5.3 Minimum Air Velocities
5.4 System Sizing
5.5 System Balancing
5.6 System Design
5.7 Example Calculations
6. Local Exhaust Ventilation Equipment
6.1 Freely Suspended Hoods
6.2 Crossdraft Table
6.3 Downdraft Table
6.4 Enclosing Hood
6.5 Open Hood
6.6 Gun-Mounted Exhaust Hood
7. Example Design Calculations for Welding Bench Hood
7.1 Hood Type
7.2 Calculations
8. Ventilation System Evaluation
8.1 Basic Relationships: Air Velocity, Pressure and
     Volume Flow Rate
8.2 Testing and Maintenance
8.3 Static Pressure Analysis
8.4 Fan Performance
8.5 Fan Horsepower
8.6 System Evaluation Summary
8.7 Ventilation Evaluation Equipment
8.8 Safety
9. Respiratory Protection
10. References
FIGURES
1. Duct Friction Loss
2. Elbow Pressure Loss
3. Branch Duct Entry Pressure Loss
4. Freely Suspended Open Hood
5. Movable
6. Crossdraft Table
7. Downdraft Table
8. Enclosing Hood
9. Open Hood with Welding Operation at Face
10. Hood Mounted on Welding Gun
11. Pitot Tube

Introduces the reader to various types of ventilation systems, including dilution and local exhaust, for control of welding fume. It contains health hazard information on air contaminants found in the fume, sample design calculations, and drawings that illustrate ventilation techniques.