Plastic welding is a process used to join two or more pieces of plastic together by melting their surfaces. This technique can be achieved through various methods, including hot air welding, ultrasonic welding, and laser welding. The goal is to create a strong bond that is often as durable as the original material. The process is commonly used in industries such as automotive, electronics, and packaging. It allows for the repair of plastic items and the creation of complex shapes without the need for adhesives. Overall, plastic welding is an efficient way to work with thermoplastics and other plastic materials.