Welding joins materials by applying heat, and sometimes pressure, with or without the use of a filler metal. The process joins metals by melting, fusing, and then solidifying the joined area. Welding is used to make structural components, aircraft, cars, ships, and most other metal industrial products. Industry firms do general repairs in their own shops on welded items, such as motor vehicles. Welders that travel to construction sites are in SIC 1799: Construction, Industry.
There are eight major welding techniques used for different applications. One of the most common is shielded metal-arc welding, which uses an electric arc to quickly weld a point. Cold welding, a more specialized technique, uses pressure alone to join metals without any heat. Explosion welding uses a controlled blast to pressure two metals. Other welding techniques include: diffusion, which uses heat and pressure; laser-beam; ultra-sonic, which utilizes high-frequency vibration; and variations of electric arc welding.
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