Welding or Flame Cutting
WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
Welding or flame cutting of the frame components is unacceptable because of the associated loss of fatigue strength. This restriction applies not only to the heat-treated components, but also the HSLA (high-strength low alloy and low carbon steel components
NOTE:
On any vehicle, disconnect both the positive and negative battery cables from the battery before welding or cutting on the vehicle. Attach the welder ground cable as close as possible to the part being welded or cut.
In instances where plasma or similar cutting processes that utilize a ground cable, extended care must be taken to prevent damage to the electronic components of the vehicle.
With an electronic engine controller, do not connect the ground cable to the control module(s) or the cooling plate. To protect the control module(s), disconnect all connectors going to the control module(s).