Занятие 14. Тема: Welding History - A Story of Harnessing Heat (Часть 2). Задание: Прочитайте и письменно переведите текст.

Занятие 14

Тема: Welding History - A Story of Harnessing Heat (Часть 2)

Задание: Прочитайте и письменно переведите текст.

A significant invention was defined in a patent by Alexander, filed in December 1924, and

became known as the Atomic Hydrogen Welding Process. It looks like MIG welding but hydrogen

is used as the shielding gas which also provides extra heat.A major innovation was described in a patent that defines the Submerged Arc Process by Jones, Kennedy and Rothermund. This patent was

filed in October 1935 and assigned to Union Carbide Corporation. The following was excepted from an article written by Bob Irving in he Welding Journal: “The importance of welding was emphasized early in the war when President Roosevelt sent a letter to Prime Minister Winston Churchill, who is

said to have read it aloud to the members of Britain's House of Commons. The letter read in part, "Here there had been developed a welding technique (referring to Submerged Arc Welding) which enables us to constructstandard merchant ships with a speed unequalled in the history of merchant

shipping."

Russell Meredith working at Northrop Aircraft Company in 1939-1941 invented the TIG process. This new process was called "Heliarc" as it used an electric arc to melt the base material and helium to shield the molten puddle. Mr.Jack Northrop's dream was to build a magnesium airframe for a lighter, faster warplanes and his welding group invented the process and developed the first TIG torches. The patents were sold to Linde who developed a number of torches for different applications. They also developed procedures for using Argon which was more available and less expensive than Helium.

In 1957, the flux-cored arc welding process debuted, in which the self-shielded wire electrode could be used with automatic equipment, resulting in greatly increased welding speeds, and that same year, plasma arc welding was invented. Electroslag welding was released in 1958, and it was followed by its cousin, electrogas welding, in 1961.

Other recent developments in welding include the 1958 breakthrough of electron beam welding, making deep and narrow welding possible through the concentrated heat source. Following the invention of the laser in 1960, laser beam welding debuted several decades later, and has proved to be especially useful in high-speed, automated welding. Both of these processes, however, continue to be quite expensive due the high cost of the necessary equipment, and this has limited their applications.

Задание 2.

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