This method is commonly used for joining plastics, and it’s particularly effective in situations where precision and minimal thermal impact are crucial. Hot air welding involves the use of a hot air gun or nozzle that directs heated air onto the material surfaces until they become soft enough to fuse. Hot wedge welding is a process used in industrial sewing machines to bond or seal materials, particularly thermoplastic fabrics. It's a method where a heated wedge (usually made of metal or ceramic) is used to melt and fuse two layers of material together without the need for stitching. The heat from the wedge softens the fabric at the interface, allowing the materials to fuse into a strong, seamless bond once they cool.