CAJ | 학술논문

搅拌摩擦焊(Friction stir welding, FSW)薄板检测历来是一个难点，现在应用于薄板焊缝检测的方法多采用横波入射法及超声相控阵扇形扫查等，但这些方法都难以实现长直焊缝的快速检测与缺陷成像。采用超声相控阵 C 扫描直接从焊缝表面对焊缝内部缺陷进行 C 扫描，研究该技术对不同厚度薄板隧道型及未熔合缺陷的探测能力，开发一套用于快速相控阵检测的机械装置，并分析FSW焊缝表面对C扫描成像的影响。试验结果证明，采用超声相控阵技术对5 mm以上厚度板中0.3 mm以上的侧孔及0.5 mm的平底孔具有良好的检测效果。
교반마찰한(Friction stir welding, FSW)박판검측력래시일개난점，현재응용우박판한봉검측적방법다채용횡파입사법급초성상공진선형소사등，단저사방법도난이실현장직한봉적쾌속검측여결함성상。채용초성상공진 C 소묘직접종한봉표면대한봉내부결함진행 C 소묘，연구해기술대불동후도박판수도형급미용합결함적탐측능력，개발일투용우쾌속상공진검측적궤계장치，병분석FSW한봉표면대C소묘성상적영향。시험결과증명，채용초성상공진기술대5 mm이상후도판중0.3 mm이상적측공급0.5 mm적평저공구유량호적검측효과。
It has been a difficult problem to detect the defects in aluminum alloy friction stir welding(FSW) joints, especially those in thin plates. Recently most of the methods adopt the transverse wave or the ultrasonic phased array S-scan. However, these means cannot present all of the defects in a single picture effectively and efficiently. Ultrasonic phased array technology is used to detect the inner defects just above the upper surface of the weld by C-Scan on different sorts of defects in plates with various thickness. A mechanical device is developed to accelerate the procedure of detection. What’s more, the influence of the roughness of the FSW surface on its detectability is analyzed. The results of the experiments show that 0.3 mm-diameter side hole and 0.5 mm-diameter flat bottom holes in a 5 mm-thick flat plate can be detected effectively with the help of ultrasonic phased array.