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Research and Development of a Novel TIG Welding Torch for Joining Thin Sheets

Science-Technology and International Cooperation Department, Sao do University, Hai Duong 170000, Vietnam
Research and Development Department, Murata Welding Laboratories Co., Ltd., Osaka 5320012, Japan
Welding Department, Hanoi University of Science and Technology, Hanoi 100000, Vietnam
Faculty of Mechanical Engineering-Mechatronics, Phenikaa University, Hanoi 100000, Vietnam
Engineering Research Center of Advanced Manufacturing Technology for Automotive Components, Beijing University of Technology, Beijing 100124, China
Author to whom correspondence should be addressed.
Authors contributed equally to this work, they are considered as co-first author.
Appl. Sci. 2019, 9(23), 5260;
Received: 22 October 2019 / Revised: 28 November 2019 / Accepted: 29 November 2019 / Published: 3 December 2019
(This article belongs to the Section Mechanical Engineering)
This paper aims to develop a novel tungsten inner gas (TIG) welding torch in order to join thin sheets efficiently. Using a narrowing nozzle (constricted nozzle) inside a conventional TIG torch can critically improve the position accuracy of the tungsten electrode and also the arc plasma characteristics and heat input density. In order to evaluate the efficiency of this new torch, weld bead appearance and cross-section images were examined by an optical microscope, scanning electron microscope (SEM), and electron back scatter diffraction patterns (EBSD). The results showed that in all cases, the weld bead profile was stable without undercut and burn-through. Full penetration weld was seen. The width of weld bead on the bottom surface was increased much in comparison to conventional TIG welding. However, the results from SEM and EBSD images indicated that in the case of low welding current, the blowholes were found out on the side of the thinner material (SS400). The penetration of SUS430 material to SS400 material was not good. It seems that no fusion of SUS430 material to SS400 at the bottom surface can be seen. Meanwhile, no blowholes were seen in the case of high welding current. The penetration was better, and the fusion was reached on the bottom surface. View Full-Text
Keywords: welding thin sheets; constricted nozzle; TIG welding; EBSD; blowhole; heat input welding thin sheets; constricted nozzle; TIG welding; EBSD; blowhole; heat input
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Huu Manh, N.; Van Anh, N.; Van Tuan, N.; Xu, B.; Akihisa, M. Research and Development of a Novel TIG Welding Torch for Joining Thin Sheets. Appl. Sci. 2019, 9, 5260.

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