Procedure Using UT Slide [PDF]

Zitiervorschau

Steps Using Ultrasonic Beam Plotter 1. Draw the actual weld profile on the transparent(plastic) ,draw also the mirror image. 2. If you got a signal, maximize and read the BPL value .For example 42mm 3. From the test plate, measure the distance from the Probe Index to the Center of the Weld using a ruler. This is called the Stand-off Distance.For example 40mm. 4. On the slide, put the probe index at Stand- Off(40mm )from the center weld. See below. Stand Off=40mm

Center of weld

60°

BPL

5. Mark the BPL (42mm)on the slide. This is where the defect is located on the weld on its mirror image. Note that, If the BPL does not landed on the weld area, it means it is a non-relevant indication. Center of weld

Stand Off=40mm 20

10

30

10

10 20 30

20

40

Defect BPL

30

6.Draw straight line from the defect upwards to know the exact location above the surface and depth of the defect on its original image. 7. From the slide, read the surface distance and mark on the test plate. Surface Distance=36mm

Center of weld 20

10

30

Depth= 3mm 10

10 20 30

20

40 50

Defect BPL

30

Note: Stand –Off Distance= Distance from Probe Index to the weld center line Surface Distance = Distance from Probe Index to the defect above the surface.