A TIG welder is a type of welding machine that uses a non-consumable tungsten electrode to produce a strong and precise weld. It works by creating an electric arc between the electrode and the metal workpiece, which melts the metal and allows it to fuse together. This method is known for its ability to weld thin materials and produce high-quality, clean welds. TIG welding is commonly used in various industries, including automotive, aerospace, and manufacturing. It can be applied to a wide range of metals, such as aluminum, stainless steel, and copper. The process requires skill and practice, making it popular among professional welders.