Ultrasonic-Leak-Tester for Cylinder-Head-Covers

In many cases Ultrasonic-Leak-Testing of MACEAS can improve/replace water bath testing and is a leak test method without the human factor. Ultrasonic leak testing is detecting directly the back scattered sound of leak bubbles when hit by an ultrasound wave. By measuring the time-of-flight, the distance between the transducer and the bubbles can be calculated using the speed of sound in water.

Therefore leak bubbles can be detected reliable without the influence of an operator and can be localised automatically.

Typ: USLT-CHC-SA-1Sx1A

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Localisation

Leak localisation	m	Sealing
	m

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Machine example
machine with manual handling of parts:
• Manual placement
• Automatic sealing
• Automatic testing

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Technical data

Test method USLT
Test pressure	6 bar (absolute)
Pressure outside	1 bar (Atmosphere)
∆p	5 bar
Test gas	Air
Leak rate	8,3·10-3 mbar·l/s

59 bubbles with a diameter of 2 mm within 30 s

Machine capacity	USLT-CHC-SA-1Sx1A
Capacity	36 St./h
Effective cycle time	100 s
Changeover time	< 30 min

Appropriate to
parts which are difficult to seal because of three open sides and with comparatively high pressure of 6 bar.


Background
Leak Test specification in general and especially for Aluminium cast parts are getting more and more worse. Sometimes this is due to new functions of the product. Therefore typically used pressure difference methods can not be applied in many cases in the future. As an alternative water bath leak testing or test gas methods may be used. While test gas methods often do not work properly under hard production conditions, water bath leak testing performed by an operator is no more accepted by the customer due to the dependence on human factor.