ABSTRACT
Welding is most commonly a metal-joining technology. Welding technology mainly involves four fundamental factors, which are (1) the metals to be joined, (2) an energy source, (3) ller material (if used), and (4) a kind of gas shield (if used). The metal is heated to its welding temperature while at the same time an inert gas from the air shields in order to avoid oxidation, and a ller metal is also often added to the joining area when producing a welded joint.
