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→Non-Destructive Test Methods
testing and X-ray analysis.
*Ultrasonic testing <br />This method is based on the disruption of the propagation of sound waves indifferent media. High resolution modern test systems with graphic print-outcapabilities and analytical software are capable to detect even small (<0.5 mmdiameter) voids in the braze joint. The portion of the wetted areas is calculatedas a percentage of the whole joint area. Fig. 3.15 shows an example of differentbraze qualities for a Ag/SnO<sub>2</sub> contact tip brazed to a copper carrier andillustrates the position and size of void areas as well as the final joint quality.<br />
Fig. 3.15: Ultrasound print-out of braze joints between Ag/SnO 88/12 tips and Cu carrier with 2
different degree of wetting (dark areas = voids)
*X-Ray testing <br />X-ray testing is an additional method for evaluating brazed joints. Using finefocusX-ray beams it is possible to achieve a sufficient picture resolution. Thereare however limitations about the thickness of the contact tip compared to thesize of the void area. This expensive test method is rarely used for contactassemblies.<br />
== Welded Joints==
