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What does AHW stand for? 

What does AHW mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: AHW.

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AHW

Fox Valley and Western Limited

Regional » Railroads

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AHW

Advanced Hypersonic Weapon

Governmental » Air Force

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AHW

Arends Hogan Walker

Miscellaneous » Unclassified

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AHW

April Hope Wareham

Miscellaneous » Unclassified

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AHW

American Home Warranty

Miscellaneous » Unclassified

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AHW

The Amature Hardcore Wrestling

Sports » Wrestling

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AHW

Als Het Ware

Miscellaneous » Unclassified

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AHW

Animal Health and Welfare

Miscellaneous » Animals

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AHW

Aircraft Hardware West

Miscellaneous » Aircraft & Aviation

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AHW

Auxiliary Health Worker

Medical » Healthcare

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AHW

Amazon Home Warranty

Miscellaneous » Unclassified

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AHW

Home Warranty

Miscellaneous » Unclassified

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AHW

Average Hours Worked

Miscellaneous » Unclassified

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AHW

Average HAZ Width

Miscellaneous » Unclassified

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AHW

Atomic Hydrogen Welding

Miscellaneous » Unclassified

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AHW

American Harvest Workshop

Community » Workshops

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AHW

A Healthier Wisconsin

Miscellaneous » Unclassified

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AHW

Alliance for a Healthier World

Governmental » Alliances

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AHW

Advancing a Healthier Wisconsin

Miscellaneous » Unclassified

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AHW

Adjustable Hydrant Wrench

Miscellaneous » Unclassified

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AHW

Adelaide Huan Wang

Miscellaneous » Unclassified

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AHW

Acutely Hazardous Waste

Miscellaneous » Unclassified

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AHW

Abnormal Hot Weather

Miscellaneous » Unclassified

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AHW

A Home Within

Miscellaneous » Unclassified

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AHW

Ahnapee and Western Railway (Fox Valley and Western)

Regional » Railroads

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What does AHW mean?

ahw
Atomic hydrogen welding (AHW) is an arc welding process that uses an arc between two tungsten electrodes in a shielding atmosphere of hydrogen. The process was invented by Irving Langmuir in the course of his studies of atomic hydrogen. The electric arc efficiently breaks up the hydrogen molecules, which later recombine with tremendous release of heat, reaching temperatures from 3400 to 4000 °C. Without the arc, an oxyhydrogen torch can only reach 2800 °C. This is the third-hottest flame after dicyanoacetylene at 4987 °C and cyanogen at 4525 °C. An acetylene torch merely reaches 3300 °C. This device may be called an atomic hydrogen torch, nascent hydrogen torch or Langmuir torch. The process was also known as arc-atom welding. The heat produced by this torch is sufficient to weld tungsten (3422 °C), the most refractory metal. The presence of hydrogen also acts as a shielding gas, preventing oxidation and contamination by carbon, nitrogen or oxygen, which can severely damage the properties of many metals. It eliminates the need of flux for this purpose. The arc is maintained independently of the workpiece or parts being welded. The hydrogen gas is normally diatomic (H2), but where the temperatures are over 6,000 °C (10,800 °F) near the arc, the hydrogen breaks down into its atomic form, absorbing a large amount of heat from the arc. When the hydrogen strikes a relatively cold surface (i.e. the weld zone), it recombines into its diatomic form, releasing the energy associated with the formation of that bond. The energy in AHW can be varied easily by changing the distance between the arc stream and the workpiece surface. In atomic hydrogen welding, filler metal may or may not be used. In this process, the arc is maintained entirely independent of the work or parts being welded. The work is a part of the electrical circuit only to the extent that a portion of the arc comes in contact with the work, at which time a voltage exists between the work and each electrode. This process is being replaced by gas metal-arc welding, mainly because of the availability of inexpensive inert gases.

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Atomic Hydrogen Welding
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