thei shullen welle togidere her swerdes in-to scharris." (they shall weld together their swords into plowshares), suggesting this particular use of the word probably became popular in English sometime between these periods. thei shul bete togidere their swerdes into shares." (they shall beat together their swords into plowshares), while the 1590 version was changed to, ". The original version, from Isaiah 2:4, reads, ". It was first recorded in English in 1590, from a version of the Christian Bible that was originally translated into English by John Wycliffe in the fourteenth century. The modern word was probably derived from the past-tense participle welled ( wællende), with the addition of d for this purpose being common in the Germanic languages of the Angles and Saxons. The term weld is derived from the Middle English verb well ( wæll plural/present tense: wælle) or welling ( wællen), meaning 'to heat' (to the maximum temperature possible) 'to bring to a boil'. The Old English word for welding iron was samod ('to bring together') or samodwellung ('to bring together hot', with hot more relating to red-hot or a swelling rage in contrast to samodfæst, 'to bind together with rope or fasteners'). It is often confused with the Old English word weald, meaning 'a forested area', but this word eventually morphed into the modern version, wild. The term weld is of English origin, with roots from Scandinavia.
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Following the wars, several modern welding techniques were developed, including manual methods like shielded metal arc welding, now one of the most popular welding methods, as well as semi-automatic and automatic processes such as gas metal arc welding, submerged arc welding, flux-cored arc welding and electroslag welding. Welding technology advanced quickly during the early 20th century as world wars drove the demand for reliable and inexpensive joining methods. Arc welding and oxy-fuel welding were among the first processes to develop late in the century, and electric resistance welding followed soon after. Until the end of the 19th century, the only welding process was forge welding, which blacksmiths had used for millennia to join iron and steel by heating and hammering. Welding is a hazardous undertaking and precautions are required to avoid burns, electric shock, vision damage, inhalation of poisonous gases and fumes, and exposure to intense ultraviolet radiation. While often an industrial process, welding may be performed in many different environments, including in open air, under water, and in outer space. Many different energy sources can be used for welding, including a gas flame (chemical), an electric arc (electrical), a laser, an electron beam, friction, and ultrasound. Welding also requires a form of shield to protect the filler metals or melted metals from being contaminated or oxidized. Pressure may also be used in conjunction with heat or by itself to produce a weld.
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In addition to melting the base metal, a filler material is typically added to the joint to form a pool of molten material (the weld pool) that cools to form a joint that, based on weld configuration (butt, full penetration, fillet, etc.), can be stronger than the base material.
Welding is distinct from lower temperature techniques such as brazing and soldering, which do not melt the base metal (parent metal). 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.
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