When using a puller tool to install a pre-installed ground stud, what occurs to the head of the stud?

When using a puller tool to install a pre-installed ground stud, the correct outcome is that the head of the stud swedges into the hole. This process involves the head of the stud deforming slightly to create a tight fit against the surrounding material. When the puller tool exerts force, it causes the material at the head of the stud to flow into the contours of the installation hole, which secures it in place through a mechanical interlock. This method is designed to ensure that there is a reliable electrical connection for grounding purposes, as well as providing structural stability.

Swedging is an important technique utilized in aerospace assembly because it minimizes the possibility of loosening over time due to vibration or thermal cycling. The deformation ensures a snug fit while also reducing the likelihood of stress concentrations that could lead to failure down the line. By effectively locking the stud in place, swedging plays a critical role in maintaining the integrity of the aircraft’s electrical systems.