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Helium

 

 

Helium (He)

Helium (He) is the second lightest process gas next to hydrogen. Colorless, odorless, tasteless, nontoxic and chemically inert, helium is nonflammable and, when compared with argon, has a high thermal conductivity. Helium-enhanced mixtures are utilized to create an inert gas shield and prevent oxidation during open arc welding of metals such as aluminum, stainless steel, copper and magnesium alloys. The addition of helium generally increases weld pool fluidity and travel speed. Penetration properties will be broader and travel speed is typically increased with the addition of helium to the shielding gas mixture. Use of helium-enhanced mixtures will also lessen the formation of welding ozone when welding on aluminum alloys.

Chemical Formula He
Minimum Purity 99.995 %
Cylinder CGA Outlet 580
680 (greater than 3,000 psig)
MSDS P-4602
CAS Number 7440-59-7
UN Number 1046
US DOT Name Helium, Compressed
US DOT Label Nonflammable Gas
US DOT Class 2.2 Nonflammable Gas

 

Cylinder Style Volume (ft3/m3) Pressure at 70 °F (21 °C) (psig/kPa) Part Number
T 286/7.94 2640/18202 HE T
K 213/5.91 2200/15168 HE K