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Welding is a fabrication process that joins materials, usually metals or thermoplastics, by using high heat to melt the parts together and allowing them to cool, causing fusion. Welding is distinct from lower temperature metal-joining techniques such as brazing and soldering, which do not melt the base metal. It is a fabrication process that involves the usage of heat, pressure, or both to fuse two parts... Welding involves the heating and cooling of the metal - there is no other chemical reaction involved. However, the weld becomes weak if oxygen reacts with the molten metal. Using protective gases around the weld pool prevents oxygen and other contaminants from damaging the joint... Everything about Welding, Welding Alloys, Wires and Electrodes.