CDS-Vorlaufkeile sind vorgesehen für die Erzeugung einer Transversalwelle von 30 Grad und einer Longitudinalwelle von 70 Grad in Stahl zur Fehlergrößenbestimmung mit der 30-70-70-Methode. Sie messen insbesondere bis an die Innenwand reichende Risse.
The 30-70-70 crack detection technique uses a single element transducer with a CDS wedge for detection and sizing of ID connected cracks. This technique uses a combination of three waves for sizing flaws of different depths.
An OD creeping wave creates a 31.5 degree indirect shear, (red in diagram to the left), wave which mode converts to an ID creeping wave; this will produce a reflected signal on all ID connected cracks.
A 30 degree shear wave, (yellow in diagram to the left), will reflect off the material ID at the critical angle and mode convert to a 70 degree longitudinal wave; a signal will be received by the transducer on mid-wall deep cracks.
A 70 degree longitudinal wave, (blue in diagram to the left), will reflect off the tip of a deep wall crack.
Based on the presence or absence of these three waves, both detection and sizing of ID connected cracks is possible.
CDS-Vorkeile
CDS Wedges
CDS Wedges are used in the "30-70-70" technique for crack detection and sizing. They are compatible with our replaceable miniature screw-in angle beam transducers, making them an economical alternative to other commercially available products.
Fits Nominal Element Size
Wedge Part Number
inches
mm
0.25
6
CDS-4T
0.375
10
CDS-7T
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