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Helium
From GAWDAwiki
Helium (He) is the lightest of the inert gases. Due to its light weight, approximately two to three times more helium is needed to shield a weld area than argon. However, helium can be used with greater arc voltages than argon, which is why helium is preferred when working with thick metal sections.[1] Helium blends are commonly used to take advantage of the benefits of each gas while minimizing the disadvantages. Helium is most commonly blended with argon (at various ratios) or argon and carbon dioxide. Blends can be generated on site or can be purchased already mixed.
Read more: Uses for Helium Gas | eHow.com http://www.ehow.com/list_6030020_uses-helium-gas.html#ixzz1NZWn6y8k
Contents |
Properties
- Molecular formula: He
- Atomic number: 2
- Atomic weight: 4.002602
- Melting point: -458.0°F (-272.2°C or 0.95 K)
- Boiling point: -452.07°F (-268.93°C or 4.22 K)
- Density: 0.0001785 grams per cubic centimeter
- Phase at room temperature: Gas
- Element classification: Non-metal
- Period number: 1
- Group number: 18
- Group name: Noble gas[2]
References
- http://www.amtonline.com/publication/article.jsp?pubId=1&id=1685&pageNum=1
- http://education.jlab.org/itselemental/ele002.html
- http://www.environics.com
Spec Sheets
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