中国焊接
中國銲接
중국한접
CHINA WELDING
2014年
4期
32-36
,共5页
non-destructive testing%ultrasonic C-scan%honeycomb structure%brazed joint%orthogonal design
The non-destructive testing ofbrazed joint in honeycomb structure with thin panel(thickness:0.2 mm)was studied by ultrasonic C-scan method.Samples with different types ofartificial defect were designed;the characteristic signal and the main parameters ofthe test were determined by the pre-experiment,and then parameters were optimized by orthogonal design, finally the optimum process was verified by a single panel sample. The multiple reflection echoes were chosen as the characteristic signal.The optimal C-scan results were achieved when the 20 MHz focus probe was used,and the pass band range for received signal were selected as 8-17.5 MHz.The defects such as incomplete penetration and core damage can be detected with ultrasonic C-scan,and the detection accuracy can reach to 1 mm.
