Английский для сварщиков. Гричин С.В. - 28 стр.

UptoLike

ВУЗ: 

ТПУ | Томск

Составители: 

Рубрика: 

28
In 1904 Oscar Kjellberg in Sweden, who started ESAB, invented and
patented the covered electrode. This electric welding process made strong
welds of excellent quality.
World War I caused a major surge in the use of welding processes,
with the various military powers attempting to determine which of the several
new welding processes would be best. The British primarily used arc
welding, even constructing a ship, the Fulagar, with an entirely welded hull.
The Americans were more hesitant, but began to recognize the benefits of arc
welding when the process allowed them to repair their ships quickly after a
German attack in the New York Harbor at the beginning of the war. Arc
welding was first applied to aircraft during the war as well, as some German
airplane fuselages were constructed using the process.
During the 1920s, major advances were made in welding technology,
including the introduction of automatic welding in 1920, in which electrode
wire was fed continuously.
Shielding gas became a subject receiving much attention, as scientists
attempted to protect welds from the effects of oxygen and nitrogen in the
atmosphere. Porosity and brittleness were the primary problems, and the
solutions that developed included the use of hydrogen, argon, and helium as
welding atmospheres.
During the following decade, further advances allowed for the welding
of reactive metals like aluminum and magnesium. This, in conjunction with
developments in automatic welding, alternating current, and fluxes fed a
major expansion of arc welding during the 1930s and then during World War
II.
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 construct

Страницы