Shielding gas-argon-advantages of argon, Mechanical Engineering


Argon is approximately one and one third times as heavy as air and ten times heavier than helium. Argon, after leaving the torch nozzle, forms a blanket over the weld area. ,Welding grade argon is refined to a minimum purity of 99.95 %. This isacceptable for TIG welding of most metals except for the reactive and refractory metals, for which a minimum purity of 99.997 % is required.

Advantages of argon.


  • Smoother, quieter arc action.
  • Reduced penetration & cleaning action when welding materials such as aluminium and magnesium.
  • Lower cost and greater availability.
  • Lower flow rates for good shielding.
  • Better cross draft resistance.
  • Easier arc starting due to low ionisation potential of 2.52 x 1G- 18J (15 JeV)
  • The reduced penetration of an argon shielded arc is particularly helpful in vertical or overhead welding since the tendency for the base metal to sag or run is decreased. 
Posted Date: 9/14/2012 8:44:49 AM | Location : United States

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