为了测量高温高压的管道壁厚, 将与管道材料相同的导波杆以全焊透的形式垂直地焊接在管道的监测部位。导波杆端部采用风冷或水冷, 使端部温度降低, 直到可以使用常规的超声波探头及耦合剂进行测厚。讨论了测厚系统温度与声速的关系及测量数据的修正方法, 以不锈钢材料为例, 对焊接导波杆的圆平板、直管及弯管试件进行了测量和修正, 测量结果与壁厚实际值能较好地吻合。

For the thickness measurement of high pressure and high temperature tube, a waveguide bar with the same material was suggested to be vertically welded to the pipe thickness monitoring position with full penetration, in which the waveguide might be cooled by air or water to the temperature making thickness monitoring possible for pipes with conventional ultrasonic sensor and coupling medium. Taking stainless steel as example, waveguides were welded to circular flat plate, straight pipe and elbow for thickness measuring. The experiment results were in agreement with the specimen thicknesses. The relationship between the sound velocity and temperature was worked out for the thickness measuring system and was used for correction of ultrasonic thickness gauge readings, which verified the feasibility of the method.