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Communication Dans Un Congrès Année : 2020

Using Dynamic Time Warping for Ultrasonic Sheet Metal Welding monitoring

Résumé

Ultrasonic Sheet Metal Welding (USMW) is a friction welding process in which thin sheets of metal are welded together. The process is commonly used in the industry, for example in Lithium-ion battery manufacturing. However, even when given the same welding parameters, the strength of the weld can vary, and many factors can influence it. Currently, not enough is known about the welding process to be able to accurately control the quality of the weld during welding. Nevertheless, different models have already been suggested. One of these models divides the welding process into different stages, each with distinctive behaviours of the welding tools. The goal of this paper is to apply Dynamic Time Warping (DTW) techniques to identify the different stages of the welding process for welds done with varying parameters. DTW achieves that by measuring the similarity between different sections of different time sequences, and finding the sections with the most similarity. For this, thin copper sheets are welded, while varying welding parameters such as the amplitude of the welding excitation, the pressure applied on the sheets, the rolling direction, or the energy input into the system. All these changes of parameters lead to changes in the total duration of the welding process, as well as changes in the behaviour of the tool vibrations and in the sound emissions from the welding process, which are measured using two laser Doppler vibrometers and a 1/4? microphone.
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Dates et versions

hal-03240279 , version 1 (29-05-2021)

Identifiants

Citer

Elie Abi Raad, Michael Vorländer. Using Dynamic Time Warping for Ultrasonic Sheet Metal Welding monitoring. Forum Acusticum, Dec 2020, Lyon, France. pp.2309-2315, ⟨10.48465/fa.2020.0521⟩. ⟨hal-03240279⟩
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