Method for detecting brazing defects in plate-fin type heat exchangers
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United States of America Patent
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-
Nov 1, 1983
Grant Date -
N/A
app pub date -
Oct 15, 1981
filing date -
Oct 16, 1980
priority date (Note) -
Expired
status (Latency Note)
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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.
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