Application Note Title: Recommendations for setting up
Contents
1. 2222 O view iS helpful Material Steel Component Part View i Serial Location Reference Thickness 15 00 mm Velocity LW 5 690 mm s us Velocity SW 3 240 mm s Calibration Block Type IW AZ Calibration Block Serial Weld Type SingleV Root Gap 11 00 mm Top Bevel Width 26 00 mm Root Face Left 2 01 mm Top Left Bevel Width 13 00 mm Top Left Bevel Angle 30 00 Ensure that the Thickness is correct For TOFD the a cicada exact weld geometry is not so important as we are not using reflections but it should be approximately correct as a visual guide 4 Geometry Wedge 1 Index Offset 30 00 mm 4 Select the overall view and the geometry tab eee renee a Adjust the wedge Offsets so that the primary pete wee ni beam insects at the desired depth E g 2 3 of Wedge 2 Index Offset 30 00 mm thickness in many cases see table 1 Wedge 2 Scan Offset 0 00 mm Note that the wedge offsets should normally be 5795 2 Fetter al equal one negative one positive and that each is half the total PCS probe centre separation b Confirm that the wedges are well clear of the weld crown c Confirm that for a single probe inspection the shaded scan area covers the entire volume of 2 Fatt the weld Beam divergence in the view menu should be set to 12dB d If these requirements cannot be achieved it may be necessary to change the PCS wedge angle or even probe type Page 3 Application Note Recommendations f2. Application Note Recommendations for setting up TOFD on the veo A Sonatest Application Note Title Recommendations for setting up TOFD on the veo Author Joe Buckley Sonatest Ltd Date Feb 28 2011 Selection of Probe Configuration Easiest guide is CEN TS14571 Thickness Number of Depth Range Centre Beam Angle Element Beam t mm TOFD set ups At mm frequency Long waves size Intersection f MHz mm ee 5 3 3 6 5 3 5 3 3 6 50 100 0 t 2 70 60 1 3 of t t 2 t 60 45 6 12 5 6 oft ort for 45 2 2 0 t 3 70 60 2 9 ott t 3 2t 3 5 3 60 45 6 12 5 9 of t 2t 3 t 5 2 60 45 6 20 8 9 of t or t for 45 200 300 0 t 4 1 12 of t t 4 t 2 5 12 of t t 2 3t 4 8 12 of t 3t 4 t 11 12 of t or t for lt 45 Where possible the higher frequency should be used to improve measurement accuracy but this will require more gain and may not always be practical Note that the veo can support up to 2 pairs of TOFD probes so Inspection of steel more than 100mm thick will require two passes For thicknesses above this more specialised equipment or multiple scans should be used Page 1 Application Note Recommendations for setting up TOFD on the veo In favourable circumstances e g when testing new material moderate thickness lt 25mm or so the veo may be able to operate without a preamplifier but it is recommended that one be available unless the inspection is well known It is normal to operate a
3. is adequate EN583 recommends that Page 4 Application Note Recommendations for setting up TOFD on the veo a Check that the noise before the lateral wave signal is at least 6dB less than the noise after it i e the electronic noise is not significant compare to the material noise b Arepresentative block reference diffractors should be used to verify sufficient signal to noise ratio 3 While Scanning Detailed recommendations are outside the scope of this veo specific hints F3 button is a quick shortcut to the reset encoder position For later analysis you need to be recording data refer to the veo user manual or quick start guide 4 Measurement settings The Hyperbolic cursors can be useful for quick measurements while scanning Useful when scanning Select H1 Scan position and depth H2 Scan position and depth H1 H2 Distance D1 H2 Depth an H1 J H1 s H2 8 H2 H1 H2 Dist Scan H1 H2 Dist J 07 10 re Fa Measurements ik V LE e Ae Ara LU ttl MOM E ALAA aco 301z WM l Measurement1 PT Pui hnoou Ehon r E ey earned eee H1 Ju f Measurement 2 Measurement 4 H24 gt v Measurement 5 H1 H2 Dist Scan v Measurement 6 H1 H2 Dist v ras Exit eT I bT aA A 1 Scan Index N A Select which measurement you want at position 4 in the measurement bar al In Preferences turn on Keep Measurement Bar This will show Measurement values rather the list of settings tabs Page 5 Applica
4. or setting up TOFD on the veo 5 If setting up on UT Studio for later use on a veo check also that a In Inspection menu Voltage is set to 200V b In scan menu Gain is set to approx 90 dB Wave mode to LW PRF approximately 2 kHz Filter to match probe Averaging typically 4 c Set Ruler Lateral Wave Position and Back wall position to match the theoretical values d In encoder menu set if known the encoder resolution Scan distance etc 6 Save the file with a suitable name 2 Initial Calibration 1 Adjust Scanner PCS to match value set in Software Ensure that the scanner is securely clamped in position 2 Set up scanner on a good piece of material if possible away from the weld Apply couplant or start water pump as appropriate rh aS da CCU a en ie a a 1 2 aes Beet eee Hi es a 3 Adjust gain so that Lateral wave signal is at approx 60 4 Confirm that the displayed positions of the lateral wave and Back wall reflection correspond approximately to the calculated values If there are significant differences investigate Note a few mm error in the PCS makes quite a difference Adjust the LW and BW rulers to match Small errors can be accommodated by adjusting the ruler LW position laco cone WM Set Ref Gain N A Distance at which your scan stops recording samples for all beams 5 Check the encoder Calibration is correct 6 Confirm that the signal to noise
5. t 90 dB or so when working without a preamplifier Some applications e g in service inspection for weld root erosion do not normally require such high gain levels and a preamplifier may not be needed 1 Configuring Scan Plan Note these examples show the work carried out on UT Studio 3 Configuring on the veo is very similar 1 Start with one of the TOFD example files 2 Load the selected Probes and wedges 2 of each Note that a Probe 1 should be connected to ChA TX RX b Probe 2 should be connected to ChA Rx c Check that both probes and both wedges are the same d Check that LW wave mode is selected Ww Probe wil Wedge HJ P1 Mono Circular Ch A TX RX E a Wedge Angular i Probe Type Mono Circular Wedge Type Angular Manufacturer Phoenix Manufacturer Phoenix Model Phoenix ISL 10 02 Model Phoenix ISL7O Serial Serial Frequency 10 00 MHz Back Height 9 30 mm Pulse Width 50 00 ns Front Height 14 30 mm Connected to Ch A TX RX Width 30 00 mm First Element Pin 1 Length 20 00 mm Element Diameter 6 00 mm Wave Mode LW Velocity Element Offset mencion I 0 00 mm Refracted Angle 70 00 Element Offset eo Dimension 2 0 00 mm Roof Angle 0 00 First Element Pin 1 Probe Back Distance 3 00 mm ee ee ee N eo seem emm Load Save Load Save Page 2 Application Note Recommendations for setting up TOFD on the veo 3 Set up the Part details using the part view oroverall 4 2 2 2 222222222
6. tion Note Recommendations for setting up TOFD on the veo Straightening The veo provides the facility to straighten or align the lateral wave at a consistent point This is very useful to allow reliable measurements to be taken The Threshold and window used for straightening can be adjusted so that the straightening can be carried out without incorrect application to situations where the lateral wave is correctly disturbed for example by surface breaking cracks The same facility is provided in the UT studio software Note that lateral wave straightening can only be carried out using recorded data To apply straightening Record the TOFD data In the scan menu ensure that the lateral wave position is correctly set In the Scan menu select straightening and turn it on a 2 In the straightening menu a Check that show indicators is on b Adjust LW Trig tolerance to a suitable value as shown by the colour band on the TOFD scan c Adjust the LW trig Threshold to a suitable value as shown on the A scan The TOFD scan will easily show if some points drop below the threshold This can be checked for validity as above 1 H2 Dist J b gt 07 17 shel 64 mm Le oonz A ne le j a Scan Frame The threshold of the trigger used for signal straightening Interpretation of TOFD data is outside the scope of this note Consult appropriate references such as EN15617 Page 6
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