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Ultrasonic Thickness Measurements of Hot Metals


Ultrasonic thickness gauging is not just limited to materials at normal (ambient) temperatures. The thickness of a part can be measured even when the surface temperature approaches 900 deg F (500 deg C). In metals particularly there may be circumstances when the thickness of the part needs to be measured during an ongoing process where the test piece cannot be cooled down.

Ultrasonic testing has the advantage - just as at normal temperatures - that thickness measurements can be taken from one side of the hot part. Ultrasonics may be the preferred method of measurement even when both sides of the hot metal part are accessible. The reason is that ultrasonic thickness measurements can be made instantly and with very brief contact with the hot surface.

For the best calibrated accuracy, the effect of the higher temperature on the velocity of sound must be taken into account. Although change in sound velocity with temperature is much less in metals than in plastics, significant errors in measured thickness can result if sound velocity is not corrected.

Equipment: A major reason to classify hot metals separately is that when the temperature of a surface exceeds approximately 120 deg F (50 deg C), Microscan contact transducers cannot be used because they will be damaged by thermal expansion effects. Consequently, gauges that exclusively utilize contact transducers cannot be used for making thickness measurements on hot surfaces.

For measurement of smooth hot metal we recommend the Model 38DL PLUS, or Model 45MG with Single Element software, which can be used with delay line transducers or immersion transducers. On hot surfaces delay line transducers must be used with selected high temperature delay lines. The thickness of hot corroded metal parts or parts with rough surfaces should be measured with a D790 or D791 dual transducer. The 38DL PLUS and , 45MG gages can both be used for this purpose.

Olympus IMS
应用所使用的产品

手持式45MG是一款配置有各种测量功能和软件选项的超声测厚仪。这款独特的仪器与所有Olympus双晶和单晶探头探头兼容,是一款集所有解决方案于一机的创新型仪器,可用于几乎所有测厚应用。
38DL PLUS是一款高级超声测厚仪。这款仪器可使用双晶探头对内部腐蚀的部件进行检测。其性能包含THRU-COAT®(穿透涂层)和回波到回波。还可以使用单晶探头对薄材料、极厚材料以及多层材料进行非常精确的厚度测量。
27MG是一款基本超声测厚仪,其设计目的是从一侧对内部受到腐蚀或侵蚀的金属管道和工件进行精确的测量。这款仪器重量极轻、坚固耐用,且其设计符合人体工程学的要求,操作人员使用单手即可方便地进行操作。
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