Melding by Welding
Welding is the process of permanently joining two or more materials together, usually metals,by heat or pressure or both. When heated, the material reaches molten state and may bejoined together with or without additional filler materials being added.
Many different energy sources can be used for welding including gas flames, electric arcs,electric resistance, lasers, electron beams, friction, molten metal baths and ultrasound.
Welding includes joining methods as diverse as fusion welding, forge welding, friction welding, braze welding, brazing, soldering and explosion welding. Welding is a potentially hazardous activity and precautions are required to avoid electrocution, fire and explosion,burns, electric shock, vision damage, inhalation of poisonous gases and fumes, and exposure to intense ultraviolet radiation.