摘要
采用多区聚焦超声检测技术检测结构件的大厚度电子束焊焊缝。通过人工缺陷上检测灵敏度试验,结果表明:厚70mm以内检测灵敏度可以达到0.4mm平底孔且信噪比达到9dB以上,完全满足超声可检性的要求;水浸法平探头检测和接触法纵波检测的信噪比差,均不如多区聚焦检测,无法满足超声可检性要求。对于厚度为60mm的电子束焊缝,多区聚焦检测能检测出0.4-15dB的小缺陷,优于射线照相检验的灵敏度。因此多区聚焦检测技术是大厚度电子束焊缝质量评价的有效工具。
In the purpose of inspecting great thickness EBW, multizone focused inspection technique was applied. The results of sensitivity testing on the defect specimen were showed： the sensitivity was achieved φ0.4mm flat bottom holes and signal to noise ratio（S/N） was achieved above 9dB beyond 70mm,it achieves the demands of ultrasonic inspection; The signal to noise ratio（S/N） is poor with immersion flat transducer inspection and contact method using longitudinal wave, not achieving the de- mands of ultrasonic inspection. φ0.4^15dB small defect was discovered with multizone ultrasonic inspection technique beyond 60mm. and the sensitivity was better than X-ray. So multizone focused inspec tion was effective for quality evaluation of great thickness EBW.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2009年第6期73-77,共5页
Journal of Materials Engineering
关键词
多区聚焦检测技术
信噪比
电子束焊
焊缝
multizone focused inspection technique
signal to noise ratio（S/N）
EBW
seam
