| 狄成军,李潇,罗忠兵,刘晨飞,金士杰.铝合金薄板焊缝根部缺陷高阶半跨模式波定量检测*[J].,2025,44(1):120-127 |
| 铝合金薄板焊缝根部缺陷高阶半跨模式波定量检测* |
| Quantitative detection of root defects in aluminum alloy thin plate joints by higher-order half-skip mode waves |
| 投稿时间：2023-09-15 修订日期：2024-12-25 |
| 中文摘要: |
| 铝合金薄板焊接时会产生接近垂直的根部缺陷,且表面余高制约超声检测探头与楔块布置。结合常规半跨模式波的全聚焦方法(total focusing method,TFM)有助于实现根部垂直缺陷轮廓表征与定量,但受余高影响,相控阵探头声场仍难以有效覆盖焊缝区域。本文考虑了薄板内的超声波多次反射,提出利用声束路径更长、声场覆盖范围更广的高阶半跨模式波进行缺陷轮廓重建。对存在和不存在余高的厚度6.0 mm铝合金板中端点深度3.0 mm、高度3.0 mm的根部裂纹,采用32阵元、中心频率5 MHz相控阵探头配合55°横波楔块实施全矩阵捕捉(full matrix capture,FMC)和高阶半跨模式波成像。仿真和实验结果表明,缺陷轮廓可以被完整呈现,且缺陷高度定量相对误差均不超过5.0%。此外,需依据板材厚度合理选择半跨模式波阶数,板厚越薄,适用的半跨模式波阶数越高。 |
| 英文摘要: |
| The near-vertical defects are generated at the root of aluminum alloy thin plate joints, and the placement of ultrasonic probe and wedge is restricted due to weld crowns. The total focusing method (TFM) combined with the conventional half-skip mode wave is helpful for realizing the profile reconstruction and quantitative detection of vertical defects at the root. However, the acoustic field from phased array probe is difficult to cover the weld area effectively by the influence of weld crowns. In this paper, the defect profiles are reconstructed using the higher-order half-skip mode waves with longer acoustic paths and wider acoustic field coverage in consideration of the multiple ultrasonic reflections in thin plates. The full matrix capture (FMC) and higher-order half-skip mode wave imaging were performed on the root cracks with 3.0 mm tip depth and height in 6.0 mm thickness aluminum alloy plates with and without weld crown by using 55° wedge and 32-element and 5 MHz center frequency array probe. The simulated and experimental results indicate that the defect profiles can be represented completely and the relative measurement errors of flaw heights are within 5%. Moreover, the order of half-skip mode wave should be reasonably selected according to the plate thickness. The thinner the plate, the higher the selected half-skip wave order. |
| DOI：10.11684/j.issn.1000-310X.2025.01.012 |
| 中文关键词: 薄板 高阶半跨模式波 焊缝余高 超声检测 定量检测 |
| 英文关键词: Thin plate Higher-order half-skip mode wave Weld crowns Ultrasonic testing Quantitative detection |
| 基金项目:国家自然科学基金项目(52275520) |
|
| 摘要点击次数: 11 |
| 全文下载次数: 6 |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
