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

Hamed Zargari, Habib and Ito, Kazuhiro and Miwa, Tsuyoshi and Parchuri, Pradeep Kumar and Yamamoto, Hajime and Sharma, Abhay (2020) Metallurgical Characterization of Penetration Shape Change in Workpiece Vibration-Assisted Tandem-Pulsed Gas Metal Arc Welding. Materials, 13 (14). pp. 1-15. ISSN 1996-1944

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Abstract

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-GMAWeven 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. © 2020 by the authors.

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IITH Creators:

IITH Creators	ORCiD
Sharma, Abhay	https://orcid.org/0000-0001-7069-3621

Item Type:

Article

Additional Information:

This research was funded by The Joint Usage/Research Center on Joining andWelding, Osaka University, and also by Project to Create Research and Educational Hubs for Innovative Manufacturing in Asia, Osaka University, funded by Special Budget Project of the Ministry of Education, Culture, Sports, Science and Technology, project code 20990018. The investigation is a result of joint research program between Indian Institute of Technology and Joining andWelding Research Institute (JWRI), Osaka University.

Uncontrolled Keywords:

Penetration shape; Pulsed welding; Resonance phenomenon; Si segregation; Tandem gas metal arc welding; Workpiece vibration

Subjects:

Physics > Mechanical and aerospace

Divisions:

Department of Mechanical & Aerospace Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

15 Nov 2022 06:38

Last Modified:

23 Nov 2022 10:03