集束空気超音波を用いた回折ラム波測定によるスポット溶接ナゲット径の非接触評価

• 徐 晨艶

  長岡技術科学大学

• 井原 郁夫

  長岡技術科学大学 工学部

書誌事項

タイトル別名

• Non-contact evaluation of spot-welded nugget size based on measuring diffracted Lamb waves by focused air-coupled ultrasound

抄録

Spot-welding is widely used in various fields of industries. Since the size and quality of a welded nugget are closely related to the bonding strength of the weld, its quantitative evaluation is important to improve the reliability of the welded structure. In this work, a nugget sizing method based on measuring Lamb waves diffracted at the nugget boundary of a spot weld is proposed. In this method, the nugget size is estimated from the amplitude distribution of Lamb wave diffracted at the nugget boundary when a pair of air-coupled ultrasonic transducers is being scanned near a spot weld. A pair of focused transducers of center frequency of 0.3 MHz is employed. An imitation specimen is firstly evaluated to verify to the validity of the proposed method. Based on the result, the method is applied to the nugget sizing of three spot welds fabricated with different electric currents. Although the estimated values almost agree with those obtained by a water-immersion ultrasonic method, there are certain discrepancies between them due to structural disorders at the nugget/base material interface.

収録刊行物

• 日本機械学会論文集

  日本機械学会論文集 81 (827), 15-00107-15-00107, 2015

  一般社団法人 日本機械学会

キーワード

• Spot weld
• Nugget size
• Ultrasonic measurement
• Lamb wave
• Non-contact evaluation
• Air-coupled ultrasound
• Diffracted wave

詳細情報

• CRID: 1390282680491969664
• NII論文ID: 130005089696
• DOI: 10.1299/transjsme.15-00107
• ISSN: 21879761
• Web Site: https://www.jstage.jst.go.jp/article/transjsme/advpub/0/advpub_15-00107/_pdf
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可