Investigating the potential of magnetic are oscillated GMWA - welding for hard surfacing applications
The flux cored arc welding process has some characteristic features and is therefore established in the industry to fabricate hardfacing. One advantage of the process is the possibility to vary the alloy content of the weld metal by manipulating the chemical composition of the filler material. Moreo...
| Autor Principal: | Nagel, Falk |
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| Formato: | Tesis de Maestría |
| Idioma: | Inglés |
| Publicado: |
Pontificia Universidad Católica del Perú
2015
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| Materias: | |
| Acceso en línea: |
http://tesis.pucp.edu.pe/repositorio/handle/123456789/6235 |
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| Sumario: |
The flux cored arc welding process has some characteristic features and is therefore
established in the industry to fabricate hardfacing. One advantage of the process is the
possibility to vary the alloy content of the weld metal by manipulating the chemical
composition of the filler material. Moreover, it is possible to produce self shielding
electrodes, which show advantages for outdoor applications. One the other hand this
process creates high dilution rates. One possibility to avoid this effect is to apply a
magnetic field in order to deflect the welding arc.
In this thesis, the influence of a transversal magnetic field on the weld seam formation
during FCAW was investigated. An increase of the weld width and a simultaneous
decrease of the penetration depth was achieved at a certain deflection. The influence
of the magnetic oscillation was found to be stronger for short circuit mode than for
pulsed mode. Furthermore, high frequencies in combination with a high magnetic flux
density caused a reduced process stability and consequently a worsening of the weld
bead appearance. Apart from that, the drop detachment was inhibited, when a strong
magnetic field was applied during pulsed and spray mode. |
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