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本文叙述了X射线双壁单影检测焊缝的特点，并结合有关标准讨论了K值的意义及透照中的质量控制，介绍了典型的透照实例。
This article describes the characteristics of X-ray double-walled single-shot inspection welds, and discusses the significance of K values and the quality control during the transillumination according to relevant standards. A typical example of transillumination is introduced.