In situ measurement of ultrasonic behavior during lap spot welding with laser ultrasonic method

Nomura, Kazufumi; Deno, Soshi; Matsuida, Taketo et al.

NDT and E International, 2022, 130, 102662

Number of Access:493（2025-08-14 02:54 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/88481

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Title
In situ measurement of ultrasonic behavior during lap spot welding with laser ultrasonic method
Creator
NRID
1000090397729 1000090397729
researchmap permalink
kzfmnmr kzfmnmr
Scopus Author ID
7402536774 7402536774
CreatorName
Nomura, Kazufumi
CreatorName
Deno, Soshi
CreatorName
Matsuida, Taketo
CreatorName
Otaki, Satoshi
NRID
1000020797120 1000020797120
CreatorName
Asai, Satoru
Subject
Laser ultrasonic
Tungsten inert gas (TIG) arc spot welding
In-process measurement
High-temperature
Abstract
Understanding the joining process in real time during welding can help improve welding quality, reliability, and manufacturing process efficiency. For this purpose, a laser ultrasonic method that can detect in situ welding quality without contact during welding would be useful. However, the behaviors of ultrasonic propagation as well as melting and joining with increasing temperature remain unclear. Therefore, this study aimed to experimentally investigate the in-process ultrasonic behavior when using the laser ultrasonic method. Lapped tungsten inert gas (TIG) arc spot welding was used for the ultrasonic measurements, wherein the ignition of the TIG arc from the specimen's top surface and laser irradiation for the ultrasonic measurement from the bottom surface occur simultaneously. In this welding, the melting width at the interface of the lapped plates is an important parameter. We investigated the type of ultrasonics used to measure the melting width and examined whether the melting behavior during welding could be experimentally captured. The results show that the ultrasonic velocity decreases as the temperature increases. The echo from the interface between the plates disappears, and the echo from the top surface appears. The disappearance and appearance of each echo facilitate the understanding of the melting behavior during welding.
Publisher
Elsevier
Source Title
NDT and E International
Volume (Issue)
130
Page
102662
Date of Issued
2022-09
Language
English
Handle URL
https://hdl.handle.net/11094/88481
PISSN
09638695
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.ndteint.2022.102662
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article