Tungsten inert gas (TIG) welding is the process of blending together reactive metals, such as magnesium and aluminum. During the welding process, an arc is formed between a pointed tungsten electrode and the area to be welded. A shielding gas is used to help create a clean weld, as it prevents oxidization from occurring. The welding method became popular and useful in the early 1940s and, as a result, has greatly propelled the use of aluminum for welding and structural processes. It is commonly used for both high quality and manual welding.