How to define the Welding in Steel Structure and its Evolution?

Welding

How to define the Welding in Steel Structure and its Evolution?

Welding is a fabrication method that combines materials, typically metals or thermoplastics, by melting the components together and then cooling them to cause fusion. Welding is distinguished from lower-temperature processes such as brazing and soldering in that the base metal or parent metal is not melted.

During welding, the base metal melts, and a filler material is frequently inserted into the joint to create a pool of molten material (the weld pool), which cools to produce a bond that, depending on weld design, can be stronger than the base metal (butt, full penetration, fillet, etc.). Pressure can be used in conjunction with or without of heat to form a weld. Welding also necessitates the use of a shield to keep the filler metals or molten metals from becoming contaminated or oxidized.

Welding can be done with a variety of energy sources, including a gas flame (chemical), an electric arc (electrical), a laser, an electron beam, friction, and ultrasound. Welding, while often an industrial procedure, can be performed in a variety of conditions, including open air, under water, even in space. Welding is a dangerous occupation that must be approached with attention to avoid burns, electric shock, visual damage, inhalation of deadly gases and fumes, and exposure to severe ultraviolet radiation.

Forge Welding

Forge welding, which blacksmiths had used for millennia to combine iron and steel by heating and hammering, was the only welding procedure available until the end of the nineteenth century. Late in the century, arc welding and oxy-fuel welding were among the first methods to emerge, and electric resistance welding quickly followed. Welding technology advanced significantly in the early twentieth century as world wars increased need for dependable and low-cost joining methods.

Following the wars, several modern welding techniques were developed, including manual methods such as shielded metal arc welding, which is now one of the most popular, as well as Gas metal arc welding, submerged arc welding, flux-cored arc welding, and electro slag welding are examples of semi-automated and automatic procedures. In the latter half of the century, laser beam welding, electron beam welding, magnetic pulse welding, and friction stir welding were invented. Robot welding is becoming ubiquitous in industrial settings as science advances, and researchers continue to create new welding procedures and obtain a better knowledge of weld quality.