Exhaust extraction system for welding site

摘要

An exhaust extraction system for use in a welding work station is provided which operates to exhaust the noxious fumes from the welding site when the welding operation is being carried out and for a limited period thereafter. A supply of an inert shielding gas is delivered under pressure to both the welding side and the damper control mechanism. In response to changes in pressure in the supply line of the inert shielding gas, the damper control mechanism is operable to close the damper when the welding machine is deactivated and to open the damper when the welding machine is activated.