(1. 南昌航空大學(xué) 輕合金加工科學(xué)與技術(shù)國(guó)防重點(diǎn)學(xué)科實(shí)驗(yàn)室，南昌 330063；
2. 江西省鍋爐壓力容器檢驗(yàn)檢測(cè)研究院，南昌 330063)
摘 要: 攪拌摩擦焊缺陷界面緊貼、細(xì)微、取向復(fù)雜，常用的檢測(cè)方法在角度選擇及缺陷判別上存在難點(diǎn)，超聲相控陣可在單一探頭上實(shí)現(xiàn)多角度聚焦掃查。以不同形態(tài)未焊透(LOP)和隧道孔作為研究對(duì)象，采用超聲相控陣扇掃，研究了界面取向和曲率對(duì)檢測(cè)的影響。結(jié)果表明：超聲相控陣扇掃可不移動(dòng)探頭對(duì)未焊透和隧道孔進(jìn)行精確識(shí)別；平直未焊透界面檢測(cè)受界面取向及入射角的共同影響，信號(hào)強(qiáng)度與聲束和界面偏離垂直的程度呈反比，彎曲未焊透界面檢測(cè)受界面曲率影響，信號(hào)強(qiáng)度與曲率成反比，綜合多角度檢測(cè)得到的角度-幅值曲線可以判斷未焊透界面是否彎曲。
關(guān)鍵字: 攪拌摩擦焊；超聲相控陣扇掃；未焊透；隧道孔；界面形態(tài)
（1. National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China;
2. Jiangxi Province Boiler Pressure Vessel Inspection and Testing Institute, Nanchang 330063, China）
Abstract:The defects of friction stir welding(FSW) are close and usually have complicated orientations, the commonly used methods have some difficulties in the selection of the angle and the identifying of defects, phased array ultrasonic testing can realize multi-angle focusing scanning by a single probe. Different morphologies of lack of penetration(LOP) and tunnel holes are taken as the research object, ultrasonic phased array S-scan was used to study the effects of interface orientation and curvature on the detection. The results show that the ultrasonic phased array S-scan can accurately identify LOP and tunnel holes without moving the probe. The detection of the flat LOP interface is affected by the interface orientation and the incident angle, the signal intensity is inversely proportional to the degree of deviation of the vertical reflection of the ultrasonic beam. The signal intensity is inversely proportional to the curvature of the interface when the LOP interface is curving. The angle-amplitude curve obtained by multi-angle detection can determine whether the interface can be used to determine whether the interface is curved or not.
Key words: friction stir welding; ultrasonic phased array S-scan; lack of penetration; tunnel hole; interface morphology
