The Advantage of Using Broad Bandwidth and Narrow Pulse TRL Probe for Ultrasonic Inspection of Austenitic Stainless Steel Welds
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摘要: 由于奥氏体不锈钢焊缝具有晶粒粗大、各向异性的特性，因此在超声波传播过程中出现了波束转向，散射严重，声能严重衰减等现象，所以采用常规超声探头对这类焊缝进行超声检测存在信噪比和定量精度较低等困难。而宽频带窄脉冲一发一收(TRL)式双晶纵波探头，可以较好地克服这些困难。以 273 mm×30 mm奥氏体不锈钢管道焊缝为例，验证宽频带窄脉冲TRL探头在奥氏体不锈钢焊缝超声检测中的优越性。Abstract: In austenitic stainless steel welds, the grain structure is coarse and anisotropic. When ultrasonic beam propagate in such structure , following phenomena encounter :beam deviation, serious scattering , high attenuation. So if the conventional ultrasonic probes be used, it is difficult for detecting and sizing flaws in austenitic stainless steel welds because of low signal-to noise ratio. But broad bandwidth and narrow pulse Transmitter/Receiver side-by-side L waves probe (TRL probe) can overcome these difficulties. This article will introduce the benefits of TRL probe when it be used in austenitic stainless steel welds inspection. As a validation example, the 273 mm×30 mm austenitic stainless steel pipe weld is used in this article.
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Keywords:
- Austenitic stainless steel /
- Welds /
- Broad bandwidth /
- Narrow pulse /
- TRL Probe /
- Ultrasonic testing
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[1] 李衍，冯兆国.不锈钢焊缝的超声检测－现状与发展［J］.无损探伤，2005,29(3):1-6. [2] 张鹰吗，张延丰，雷毅.奥氏体不锈钢焊缝的超声波检测方法研究［J］.无损检测,2006,28(3):119-122.
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