tungsten$85700$ - ορισμός. Τι είναι το tungsten$85700$
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Τι (ποιος) είναι tungsten$85700$ - ορισμός

Tungsten-158; Tungsten-159; Tungsten-160; Tungsten-161; Tungsten-162; Tungsten-163; Tungsten-164; Tungsten-165; Tungsten-166; Tungsten-167; Tungsten-168; Tungsten-169; Tungsten-170; Tungsten-171; Tungsten-172; Tungsten-173; Tungsten-174; Tungsten-175; Tungsten-176; Tungsten-177; Tungsten-178; Tungsten-179; Tungsten-180; Tungsten-181; Tungsten-182; Tungsten-183; Tungsten-184; Tungsten-185; Tungsten-186; Tungsten-187; Tungsten-188; Tungsten-189; Tungsten-190; Tungsten-191; Tungsten-192; Tungsten isotopes; Isotopes of wolfram; Wolfram isotopes; Tungsten isotope; Wolfram isotope

Gas tungsten arc welding         
  • GTAW fillet weld
  • GTAW weld area
  • GTAW system setup
  • Two red colored transparent welding curtains for shielding nearby persons from UV light exposure during welding.
  • A TIG weld showing an accentuated AC etched zone
  • GTAW torch with various electrodes, cups, collets, and gas diffusers
  • GTAW torch, disassembled
  • Closeup view of an aluminum TIG weld AC etch zone
  • GTAW power supply
WELDING PROCESS THAT USES A NON-CONSUMABLE TUNGSTEN ELECTRODE
Tungsten inert gas welding; TIG welding; GTAW; Gas Tungsten Arc Welding; Tig welding; Heliarc; Gas tungsten-arc welding; WIG welding; Gas tungsten; TIG-weld; TIG-welding; TIG Welder; Gas–tungsten arc welding; TIG-welded; Tungsten insert gas; Gas-tungsten arc welding; TIG welded; Gas tungsten arc; Tungsten inert gas
Gas tungsten arc welding (GTAW), also known as tungsten inert gas (TIG) welding, is an arc welding process that uses a non-consumable tungsten electrode to produce the weld. The weld area and electrode are protected from oxidation or other atmospheric contamination by an inert shielding gas (argon or helium).
Tungsten         
  • Tungsten mining in [[Rwanda]] forms an important part of the country's economy.
  • Tungsten electrode used in a [[gas tungsten arc welding]] torch
  • Close-up of a tungsten filament inside a [[halogen lamp]]
  • [[Tungsten carbide]] jewelry
  • Wolframite mineral, with a scale in cm
CHEMICAL ELEMENT WITH SYMBOL W AND ATOMIC NUMBER 74
Wolframium; Element 74; Tungstenic; Tungstem; Tungsten compounds; Tungston; W (element); Tungsten processing; Tungsten Mining; Tungsten carbonate; Wolfram (element); Tungsten alloy; Native tungsten; Tungsten nanowire; Tungsten silver; Volfram; Tungsten mining; Biological roles of tungsten; Tungsten compound; Compounds of tungsten; Wolfram compounds; Compounds of wolfram; History of tungsten
·noun Scheelite, or calcium tungstate.
II. Tungsten ·noun A rare element of the chromium group found in certain minerals, as wolfram and scheelite, and isolated as a heavy steel-gray metal which is very hard and infusible. It has both acid and basic properties. When alloyed in small quantities with steel, it greatly increases its hardness. Symbol W (Wolframium). Atomic weight, 183.6. Specific gravity, 18.
tungsten         
  • Tungsten mining in [[Rwanda]] forms an important part of the country's economy.
  • Tungsten electrode used in a [[gas tungsten arc welding]] torch
  • Close-up of a tungsten filament inside a [[halogen lamp]]
  • [[Tungsten carbide]] jewelry
  • Wolframite mineral, with a scale in cm
CHEMICAL ELEMENT WITH SYMBOL W AND ATOMIC NUMBER 74
Wolframium; Element 74; Tungstenic; Tungstem; Tungsten compounds; Tungston; W (element); Tungsten processing; Tungsten Mining; Tungsten carbonate; Wolfram (element); Tungsten alloy; Native tungsten; Tungsten nanowire; Tungsten silver; Volfram; Tungsten mining; Biological roles of tungsten; Tungsten compound; Compounds of tungsten; Wolfram compounds; Compounds of wolfram; History of tungsten
Tungsten is a greyish-white metal.
N-UNCOUNT

Βικιπαίδεια

Isotopes of tungsten

Naturally occurring tungsten (74W) consists of five isotopes. Four are considered stable (182W, 183W, 184W, and 186W) and one is slightly radioactive, 180W, with an extremely long half-life of 1.8 ± 0.2 exayears (1018 years). On average, two alpha decays of 180W occur per gram of natural tungsten per year, so for most practical purposes, tungsten can be considered stable. Theoretically, all five can decay into isotopes of element 72 (hafnium) by alpha emission, but only 180W has been observed to do so. The other naturally occurring isotopes have not been observed to decay (they are observationally stable), and lower bounds for their half-lives have been established:

182W, t1/2 > 7.7×1021 years
183W, t1/2 > 4.1×1021 years
184W, t1/2 > 8.9×1021 years
186W, t1/2 > 8.2×1021 years

Thirty-three artificial radioisotopes of tungsten have been characterized with mass numbers ranging from 157 to 194, the most stable of which are 181W with a half-life of 121.2 days, 185W with a half-life of 75.1 days, 188W with a half-life of 69.4 days and 178W with a half-life of 21.6 days. All of the remaining radioactive isotopes have half-lives of less than 24 hours, and most of these have half-lives that are less than 8 minutes. Tungsten also has 11 meta states with mass numbers of 158, 179, with 3, 180, with 2, 183, 185, 186, with 2, and 190, the most stable being 179m1W (t1/2 6.4 minutes).