About BOHS

Welding Hierarchy of Control

 

There are many different measures that can be implemented to control exposure to hazardous substances. Inevitably, some are more effective than others and it is possible to develop a list of measures in order of priority - a “Hierarchy of Control”.

Those measures towards the top of the hierarchy are normally considered to be most preferable.

In principle, anyone considering control 2 techniques should start at the top of the list, considering each option in turn and deciding whether it is feasible.

The hierarchy is a useful tool, but it must be remembered that in most cases more than one measure will need to be implemented to properly control exposure.

 

1. Elimination

Redesign the job or eliminate a substance so that the hazard is removed.

• Design the job so there is less hot work, e.g. Using CAD/3D design techniques.
• Buy in raw materials with edge profiles already cut.
• ensure surface coatings are removed prior to welding

 

2. Substitution

Replace the metal or welding technique with a less hazardous one.

• Use a welding technique that produces less fume.
• For arc welding use the lowest current and voltage applicable.
• Optimise your shielding gas.

 

 

3. Engineering controls

Use work equipment or other measures to reduce exposure.

• Use suitable local exhaust ventilation (LEV) to remove the fume at source.
• Use a turntable to enable welding in a position where the fume rises away from the face (in addition to LEV).
• Ensure adequate room ventilation

 

 

4. Management and administrative controls

These are all about identifying and implementing the procedures you need to reduce exposure.

• Introduce a dedicated area for welding.
• Control access to working area.
• Minimise the work carried out in enclosed or confined spaces.
• Implement a maintenance and test regime for LEV systems.

 

 

5. Personal protective equipment

Masks, eye protections, gloves etc.

• Wear a battery powered respirator with a welding visor or helmet if the fume cannot be controlled in other ways.
• Ensure other workers in the area are not exposed to the fume.
• Where respirators are being used ensure that they are properly fitted, used and maintained.

 

 

 

 

 

 

 

 

 

Decreasing effectiveness