Abstract
In this paper the ultrasonic test performance of water based Methylcellulose couplant on steel is reported. The couplant used in the ultrasonic testing has an influence on the amplitude of the pulse echo signal. The ultrasonic energy which is transmitted from the transducer to the test material, through the couplant which is present in the interface. The amplitudes of back wall echo increases with increasing acoustic impedance of the couplant. In this research work couplant was prepared by using 0 to 50g of methylcellulose in steps of 10g in 250 ml of water. All five types of water based methylcellulose couplant were used for testing a standard stainless steel calibration U2 block. The effect on the amplitudes of back wall echoes was studied and best possible combination of water and methylcellulose are reported.
Highlights
The contact pulse echo type ultrasonic testing has a wide range of applications such as dimensional measurements, flaw detection, medical ultrasound, sonography etc
Mubuza et al, (2012) reported that the reflection and transmission coefficients at the interface of transducer, couplant and specimen surface. The specimen they tried on steel and aluminum. They concluded that couplant (Honey) with high acoustic impedance and high transmission coefficients are most effective for detection of defects
By using the different proportions of the couplants prepared by water and methyl cellulose the ultrasonic testing is conducted by applying the couplant and their back wall echoes are measured
Summary
The contact pulse echo type ultrasonic testing has a wide range of applications such as dimensional measurements, flaw detection, medical ultrasound, sonography etc. Kim Young H., et al (2001) reported in their research about couplant effects during contact ultrasonic testing. Ashok Kumar (1996) reported thickness measurement using ultrasonic technique He concluded that the quality of results depends on the correction factor of the couplant being used. Kumar.et al (2007) has discussed in his research about various coupling conditions on ultrasonic echo parameters which may have significant effects on the couplant used and their amplitude during the ultrasonic testing. They discussed various characteristics of the couplants correction factors with various test specimen thickness. Based on above research output in this paper a mixture of water and methylcellulose has been developed as couplants for ultrasonic testing and results are reported
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