Method for detecting brazing defects in plate-fin type heat exch

Details Method for detecting brazing defects in plate-fin type heat exch Method for detecting brazing defects in plate-fin type heat exch

1981-10-15

1983-11-01

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73599, 378 59, G01N 2904

Patent

active

044124538

ABSTRACT:
A method for detecting brazing defects in a plate-fin type heat exchanger with a brazed core structure having a number of wavy fin members alternately with a number of parallelly spaced plate members, in which a pulsed sound in the frequency range of several tens KHz to several hundreds KHz is transmitted across the fin and plate members from a pulser located on one outermost plate member to a sensor located on the other outermost plate member, detecting the positions and sizes of brazing defects two-dimensionally on a plane on the basis of the level of sound received by the sensor. Three-dimensional detection of the position of the defect is also possible by combining therewith a radiographic inspection using a radiant ray source which is located on one lateral side of the core structure to irradiate a radiant ray in a direction substantially parallel with the plate members of the core structure.

REFERENCES:
patent: 3351760 (1967-11-01), Brown
patent: 3686932 (1972-08-01), Ries et al.

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