列管式换热器“管子—管板角焊缝”的超声波自动检测

Automatic Ultrasonic Inspection Used in Tube-to-Tubesheet Welds in the Heat Exchangers

列管式换热器结构中管子两端与上、下管板联接的角焊缝(图1)的焊接质量是保证整台设备长期正常运行,不发生泄漏事故的关键。此类焊缝的检验,日前国内只能使用放大镜及着色剂进行缺陷检查;用水压、空气、氨气做泄漏检查。而对焊缝内部缺陷的检测则无手段。由于列管式换热器特别是高压力的,其列管直径都较小,从十几毫米到三、四十毫米。

This paper presents the automatic ultrasonic inspection technique and the detector of the know-how of the Stamicarbon bv Netherland and its principle and application for the tube-to-tubesheet welds in high pressure heat exchangers in urea plants.