Cargando…

Metallurgical Characterization of Penetration Shape Change in Workpiece Vibration-Assisted Tandem-Pulsed Gas Metal Arc Welding

Tandem-pulsed gas metal arc welding (TP-GMAW) simultaneously uses two wire-electrodes to enhance the material deposition rate, leading to the generation of a finger-shaped penetration as one of the arcs penetrates deeper than the other. On the other hand, workpiece vibration is one of the techniques...

Descripción completa

Detalles Bibliográficos
Autores principales: Hamed Zargari, Habib, Ito, Kazuhiro, Miwa, Tsuyoshi, Parchuri, Pradeep Kumar, Yamamoto, Hajime, Sharma, Abhay
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7412249/
https://www.ncbi.nlm.nih.gov/pubmed/32664430
http://dx.doi.org/10.3390/ma13143096
_version_ 1783568564457832448
author Hamed Zargari, Habib
Ito, Kazuhiro
Miwa, Tsuyoshi
Parchuri, Pradeep Kumar
Yamamoto, Hajime
Sharma, Abhay
author_facet Hamed Zargari, Habib
Ito, Kazuhiro
Miwa, Tsuyoshi
Parchuri, Pradeep Kumar
Yamamoto, Hajime
Sharma, Abhay
author_sort Hamed Zargari, Habib
collection PubMed
description Tandem-pulsed gas metal arc welding (TP-GMAW) simultaneously uses two wire-electrodes to enhance the material deposition rate, leading to the generation of a finger-shaped penetration as one of the arcs penetrates deeper than the other. On the other hand, workpiece vibration is one of the techniques used to control the microstructure of weld metal and a heat-affected zone. It is incidentally found that a specific vibration condition changes the finger-shaped penetration into pan-bottom shaped penetration in the TP-GMAW even though the vibration energy is much lower than the arc energy. Microstructure observation and elemental analysis are carried out for the welds fabricated without vibration and with three kinds of vibration modes, namely sine, random, and shock. The specific sine-mode vibration exhibits pan-bottom. The other modes of vibration in the same welding conditions exhibited invariable finger-shaped penetration. The Si atoms as a tracer distribute uniformly in the sine-mode. However, Si atoms segregate at the bottom of the finger-shaped weld metal with the random-mode and shock-mode workpiece vibrations. The weld pool shape change is prominent at a specific frequency. A resonance phenomenon between the droplet flow pattern and the molten material flow in the weld pool is likely to play a vital role in the change.
format Online
Article
Text
id pubmed-7412249
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-74122492020-08-17 Metallurgical Characterization of Penetration Shape Change in Workpiece Vibration-Assisted Tandem-Pulsed Gas Metal Arc Welding Hamed Zargari, Habib Ito, Kazuhiro Miwa, Tsuyoshi Parchuri, Pradeep Kumar Yamamoto, Hajime Sharma, Abhay Materials (Basel) Article Tandem-pulsed gas metal arc welding (TP-GMAW) simultaneously uses two wire-electrodes to enhance the material deposition rate, leading to the generation of a finger-shaped penetration as one of the arcs penetrates deeper than the other. On the other hand, workpiece vibration is one of the techniques used to control the microstructure of weld metal and a heat-affected zone. It is incidentally found that a specific vibration condition changes the finger-shaped penetration into pan-bottom shaped penetration in the TP-GMAW even though the vibration energy is much lower than the arc energy. Microstructure observation and elemental analysis are carried out for the welds fabricated without vibration and with three kinds of vibration modes, namely sine, random, and shock. The specific sine-mode vibration exhibits pan-bottom. The other modes of vibration in the same welding conditions exhibited invariable finger-shaped penetration. The Si atoms as a tracer distribute uniformly in the sine-mode. However, Si atoms segregate at the bottom of the finger-shaped weld metal with the random-mode and shock-mode workpiece vibrations. The weld pool shape change is prominent at a specific frequency. A resonance phenomenon between the droplet flow pattern and the molten material flow in the weld pool is likely to play a vital role in the change. MDPI 2020-07-10 /pmc/articles/PMC7412249/ /pubmed/32664430 http://dx.doi.org/10.3390/ma13143096 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hamed Zargari, Habib
Ito, Kazuhiro
Miwa, Tsuyoshi
Parchuri, Pradeep Kumar
Yamamoto, Hajime
Sharma, Abhay
Metallurgical Characterization of Penetration Shape Change in Workpiece Vibration-Assisted Tandem-Pulsed Gas Metal Arc Welding
title Metallurgical Characterization of Penetration Shape Change in Workpiece Vibration-Assisted Tandem-Pulsed Gas Metal Arc Welding
title_full Metallurgical Characterization of Penetration Shape Change in Workpiece Vibration-Assisted Tandem-Pulsed Gas Metal Arc Welding
title_fullStr Metallurgical Characterization of Penetration Shape Change in Workpiece Vibration-Assisted Tandem-Pulsed Gas Metal Arc Welding
title_full_unstemmed Metallurgical Characterization of Penetration Shape Change in Workpiece Vibration-Assisted Tandem-Pulsed Gas Metal Arc Welding
title_short Metallurgical Characterization of Penetration Shape Change in Workpiece Vibration-Assisted Tandem-Pulsed Gas Metal Arc Welding
title_sort metallurgical characterization of penetration shape change in workpiece vibration-assisted tandem-pulsed gas metal arc welding
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7412249/
https://www.ncbi.nlm.nih.gov/pubmed/32664430
http://dx.doi.org/10.3390/ma13143096
work_keys_str_mv AT hamedzargarihabib metallurgicalcharacterizationofpenetrationshapechangeinworkpiecevibrationassistedtandempulsedgasmetalarcwelding
AT itokazuhiro metallurgicalcharacterizationofpenetrationshapechangeinworkpiecevibrationassistedtandempulsedgasmetalarcwelding
AT miwatsuyoshi metallurgicalcharacterizationofpenetrationshapechangeinworkpiecevibrationassistedtandempulsedgasmetalarcwelding
AT parchuripradeepkumar metallurgicalcharacterizationofpenetrationshapechangeinworkpiecevibrationassistedtandempulsedgasmetalarcwelding
AT yamamotohajime metallurgicalcharacterizationofpenetrationshapechangeinworkpiecevibrationassistedtandempulsedgasmetalarcwelding
AT sharmaabhay metallurgicalcharacterizationofpenetrationshapechangeinworkpiecevibrationassistedtandempulsedgasmetalarcwelding