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- since 1996 -

Sonatest Ltd
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Technical Discussions
Gavin Biggs
Gavin Biggs
04:34 Nov-13-2001
Solder cavitation

Hi, I'm a design engineer working for a machining company in Buckinghamshire, England. I am researching various solder joining techniques, and for some experimental trials I need to create cavitations in molten solder that is preplaced between two induction heated flat aluminium plates. Rather than building an expensive ultrasonic test rig, does anyone know if a portable ultrasonic inspection unit would be capable of causing cavitation of the solder at the joint interface by inducing ultrasonic waves into the upper plate?

My knowledge of ultrasonics is very limited, so any advise you may have would be of great help.


    
 
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Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
05:27 Nov-13-2001
Re: Solder cavitation
: Rather than building an expensive ultrasonic test rig, does anyone know if a portable ultrasonic inspection unit would be capable of causing cavitation of the solder at the joint interface by inducing ultrasonic waves into the upper plate?


I'm afraid not. Ultrasonic flaw detectors, thickness gages, and pulser/receivers designed for common nondestructive testing applications -- and the transducers used with them -- are low power devices which by design cause no discernable changes in the test piece through which the sound waves are passing. That's inherent in the definition of NDT. The power levels associated with these instruments are typically on the order of milliwatts per square centimeter with very brief pulse durations, power several orders of magnitude less than what you get from devices like ultrasonic homogenizers and ultrasonic cleaners. I'm afraid you're going to need the latter sort of approach to cause cavitation.

--Tom Nelligan
Panametrics, Inc.


    
 
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