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Orbital welding was first used in the 1960's when the aerospace industry
recognized the need for a superior joining technique for aerospace hydraulic
lines. A mechanism was developed in which the arc from a tungsten electrode was
rotated around the tubing weld joint. The arc welding current was regulated with
a control system thus automating the entire process. The result was a more
precision and reliable method than the manual welding method it replaced.
Orbital welding became practical for many industries in the early 1980's when
combination power supply/control systems were developed that operated from 110
VAC and were physically small enough to be carried from place to place on a
construction site for multiple in-place welds. Modern day orbital welding
systems offer computer control where welding parameters for a variety of
applications can be stored in memory and called up when needed for a specific
application. The skills of a certified welder are thus built into the welding
system, producing enormous numbers of identical welds and leaving significantly
less room for error or defects.
http://www.pro-fusiononline.com/welding/applications/orbital.htm
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