Although helium (He) is the universe’s second most abundant element, after hydrogen, it is extremely rare on earth and also finite. In the earth’s atmosphere, the concentration of helium by volume is only 0.0005 percent, so it cannot be obtained in significant quantities through air separation. Yet helium can reach concentrations of up to 7 percent in natural gas and can be extracted during gas processing at concentrations of 0.2 percent and above.
Industries Usage and Applications
From manufacturing to flight, helium is widely utilized throughout the aerospace and aircraft industry. In space flight operations, helium is used to purge hydrogen systems and works as a pressurizing agent for ground and flight fluid systems. It is also a source of lift in weather and other surveillance balloons.
Helium is used to test critical automotive parts such as radiator heat exchangers, air conditioning components, fuel tanks and torque converters to ensure they meet quality specifications. It is also used in combination with argon as a source of inflation in a growing number of airbags.
Helium is used to achieve cryogenic temperatures of -451 degrees required for superconducting magnets in MRIs and NMRs, allowing the capture of high-resolution images of internal organs and tissues.
Helium’s inert properties at arc temperatures make it an ideal gas for welding materials with high heat conductivity such as aluminum, stainless steel, copper and magnesium alloys. Helium is also used in heat treating processes such as gas quenching and in furnace atmospheres to produce parts with higher tolerance and improved quality.