A stiffened panel is a critical structural component in shipbuilding, consisting of a skin plate and reinforcing stiffeners welded together. It significantly increases structural strength while reducing weight.

Friction stir welding (FSW), as a solid phase welding technology, is widely used in the manufacture of large-size aluminum alloy panels for use in marine and offshore applications.

The shipbuilding industry uses friction stir welding (FSW) to produce aluminum plates from aluminum extrusions, which are widely used in ship superstructures, deckhouses, etc.