The tightening of structural and safety assemblies is often difficult to manage. It requires the definition of the tightening range at the torque or angle, the use of suitable tightening tools and its implementation by qualified operators.
Uncontrolled tightening can lead to: either overtightening and assembly damage, or being loose and provoking the loss of the elements that compose the assembly. In case of non-failure, the risk of fatigue breakage of the fasteners remains present in the long term.
The consequences can be catastrophic: vehicle crash in the transport sector (example: rail derailment...), structural failures in the building and metal sectors (example: wind turbine failure), leakage in the energy sector, etc.
Today, skilled workers use tools such as screwdrivers or dynamometric wrenches that do not provide fast and highly accurate tightening. Lastly, control operations are necessary to ensure the quality of the tightening.