Transcription
Ultrasonic Testing on Duplex Stainless SteelReference BlockCalibration BlockPresented byR.Baskar, AMIE (Mech)ASNT NDT Level III RT,UT,PT & MTCSWIP 3.2AWS – SCWI
θ 60 26 Austenitic materialVelocity 5780 m/s50mmRadiusCalibration Block for UT Equipment2GE Confidential and Proprietary InformationGE 2007 All Rights Reserved
θ 60 Calibration Block for UT EquipmentAustenitic materialVelocity 5780 m/sCalibration blocks shall as near aspracticable, have the same acousticproperties as the material to be tested(Reference: DNV-OS-F101, para. 204, page- 201)50mmRadiusθ Sin60 5780 Sin 61.7 588061.7 Duplex materialVelocity 5880 m/s50mmRadius3GE Confidential and Proprietary InformationGE 2007 All Rights Reserved
θ 60 Austenitic materialVelocity 5780 m/s26 50mmRadiusθ Duplex materialVelocity 5880 m/sInterface26 Sin60 5780 Sin 61.7 588061.7 4GE Confidential and Proprietary InformationGE 2007 All Rights Reserved
For the selected angle, the transducer shall be moved backand forth over the line indicative of the transducer angle until thesignal from the radius is maximised3 mm The sound entry point on the transducer shall be comparedwith the angle mark on the calibration block ( Tolerance 2º )50mmθ RadiusInterfaceSin60 5780 Sin 61.7 588026 5GE Confidential and Proprietary InformationGE 2007 All Rights Reserved
Austenitic Stainless SteelCalculation: Length travelled 50 mmVelocity (Austenitic Stainless Steel) 5780 m/secTime Taken to travel 50mm 8.6505 x 10 ⁶ secondDuplex Stainless SteelVelocity (Duplex Stainless Steel) 5880 m/secTime Taken to travel 50mm 8.5034x 10 ⁶ second0.85 mmEquivalent length travelled in Duplex Stainless Steelwith reference to Austenitic Stainless Steel:50 x 8.5034x 10 ⁶8.6505 x 10 ⁶ 49.15 mmDifference in time base scale 50.0 – 49.15 0.85mm0501006GE Confidential and Proprietary InformationGE 2007 All Rights Reserved
60 5ºWeld Joint Design1.7 90 15 mm1.7 20 mm90 θ Interface60 61.7 7GE Confidential and Proprietary InformationGE 2007 All Rights Reserved
Amplitude or Sensitivity Calibrationθ 26 8GE Confidential and Proprietary InformationGE 2007 All Rights Reserved
Summary The material used for calibration blocks, have the same acousticproperties as the material to be tested. (Reference: DNV-OS-F101, para. 204, page- 201) The metal velocity difference is only 100 m/sec Austenitic Stainless Steel material Velocity 5780 m/secDuplex Stainless Steel material velocity 5880 m/sec The difference in the position of indications at time base scale is only0.85mm , which can be ignored For Amplitude or Sensitivity Calibration, reference reflector (SDH) in thereference block has been used.Thanks9GE Confidential and Proprietary InformationGE 2007 All Rights Reserved
Presented by R.Baskar, AMIE (Mech) ASNT NDT Level III RT,UT,PT & MT CSWIP 3.2 AWS –SCWI Ultrasonic Testing on Duplex S
