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- Atomic_hydrogen_welding abstract "Atomic hydrogen welding (AHW) is an arc welding process that uses an arc between two metal 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 gas shield and protects metals from 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 600 °C (1100 °F) near the arc, the hydrogen breaks down into its atomic form, simultaneously 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. This process is being replaced by gas metal-arc welding, mainly because of the availability of inexpensive inert gases. 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.".
- Atomic_hydrogen_welding wikiPageExternalLink AHW.html.
- Atomic_hydrogen_welding wikiPageExternalLink atomicH.html.
- Atomic_hydrogen_welding wikiPageExternalLink atomic-hydrogen-welding.asp.
- Atomic_hydrogen_welding wikiPageID "3261380".
- Atomic_hydrogen_welding wikiPageRevisionID "584250288".
- Atomic_hydrogen_welding hasPhotoCollection Atomic_hydrogen_welding.
- Atomic_hydrogen_welding subject Category:Arc_welding.
- Atomic_hydrogen_welding subject Category:Hydrogen_technologies.
- Atomic_hydrogen_welding type Abstraction100002137.
- Atomic_hydrogen_welding type Act100030358.
- Atomic_hydrogen_welding type Activity100407535.
- Atomic_hydrogen_welding type Application100949134.
- Atomic_hydrogen_welding type Event100029378.
- Atomic_hydrogen_welding type HydrogenTechnologies.
- Atomic_hydrogen_welding type Occupation100582388.
- Atomic_hydrogen_welding type Profession100609953.
- Atomic_hydrogen_welding type PsychologicalFeature100023100.
- Atomic_hydrogen_welding type Technology100949619.
- Atomic_hydrogen_welding type Use100947128.
- Atomic_hydrogen_welding type YagoPermanentlyLocatedEntity.
- Atomic_hydrogen_welding comment "Atomic hydrogen welding (AHW) is an arc welding process that uses an arc between two metal 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.".
- Atomic_hydrogen_welding label "Atomair-waterstoflassen".
- Atomic_hydrogen_welding label "Atomic hydrogen welding".
- Atomic_hydrogen_welding label "Soldadura de hidrógeno atómico".
- Atomic_hydrogen_welding label "Soldagem com hidrogênio atômico".
- Atomic_hydrogen_welding sameAs Svařování_atomárním_vodíkem.
- Atomic_hydrogen_welding sameAs Soldadura_de_hidrógeno_atómico.
- Atomic_hydrogen_welding sameAs Atomair-waterstoflassen.
- Atomic_hydrogen_welding sameAs Soldagem_com_hidrogênio_atômico.
- Atomic_hydrogen_welding sameAs m.091z7j.
- Atomic_hydrogen_welding sameAs Q3290512.
- Atomic_hydrogen_welding sameAs Q3290512.
- Atomic_hydrogen_welding sameAs Atomic_hydrogen_welding.
- Atomic_hydrogen_welding wasDerivedFrom Atomic_hydrogen_welding?oldid=584250288.
- Atomic_hydrogen_welding isPrimaryTopicOf Atomic_hydrogen_welding.