ASME规程文件 URE

Procedure For Ultrasonic Examination Page 1 of 12 Q/HA-A-002(2004） Revision 0 Date: 8/20/2004 华安检测 PROCEDURE FOR ULTRASONIC EXAMINATION OF WELDS Prepared By: Jin Han Date Aug.20,2005 (NDE Level III) Approved By:Fang Fasheng Date Aug.20,2005 (QA Manager) Procedure For Ultrasonic Examination Page 2 of 12 Q/HA-A-002(2004） Revision 0 Date: 8/20/2004 华安检测 Certification This UT Procedure Q/HA-A-002(2004) Rev.0 has been demonstrated to the QA Manager using a test specimen with known defects and proved to be capable of producing meaningful results to the satisfaction of the QA Manager In accordance with ASME Code Section Ⅴ, Article 1.Paragraph T-150. Certified by Jin Han Date Aug.20,2005 ( NDE Level Ⅲ ) Witnessed by Fang Fasheng Date Aug.20,2005 ( QA Manager) Procedure For Ultrasonic Examination Page 3 of 12 Q/HA-A-002(2004） Revision 0 Date: 8/20/2004 华安检测 CONTENTS 1. Scope 2. Personnel requirements 3. Instrument 4. Surface preparation 5. Stage of examination 6. Couplant 7. Test block 8. Calibration of Apparatus 9. Examination Coverage 10. Speed of scanning 11. Extent of scanning 12. Evaluation of reflectors 13.Post examination cleaning 14. Acceptance standards 15. Record 16. Report 17. Accepted by A.I. Ultrasonic Instrument Calibration Record Rev.0 Ultrasonic Examination Instruction Rev.0 Record of Ultrasonic Examination Rev.0 Ultrasonic Examination Report Rev.0 Procedure For Ultrasonic Examination Page 4 of 12 Q/HA-A-002(2004） Revision 0 Date: 8/20/2004 华安检测 1.Scope 1.1 This procedure covers the requirements and acceptance standard for ultrasonic examination of ferric steel welds in accordance with ASME Code Section V and Section I, VIII Div. 1. 1. 2 These requirements are established for the ultrasonic detection and evaluation of ultrasonic reflections within the weld, heat affected zone, or adjacent material with a thickness in the range 5/16in(8mm) to 2in(50mm). 2.Personnel Requirements 2.1 Personnel performing ultrasonic examination shall be qualified and certified in accordance with the HAJC Written Practice. 3.Instrument 3.1 A pulse-echo type of ultrasonic instrument capable of generating frequencies over the range of at least 1MHz to 5 MHz shall be used such as CTS-22, PXUT-240. 3.2 The ultrasonic instrument shall provide linear vertical presentation within ±5% of the full screen height for 20% to 80% of the calibrated screen height. 3.3 Amplitude Control Linearity The ultrasonic instrument shall utilize an amplitude control, accurate over its useful range to +20% of the nominal amplitude ratio, to allow measurement of indications beyond the linear range of the vertical display on the screen. 3.4 The screen height linearity and amplitude control linearity evaluation shall be performed at the beginning of each period of extended use or every 3months. whichever is less. Indication Set at % of Full Screen dB Control Change Indication Limits % of Full Screen Measurement Result % of Full Screen 80% +6 dB 32 to 48% % 80% +12dB 16 to 24% % 40% -6 dB 64 to 96% % 20% -12dB 64 to 96% % 3.5 For straight-beam scanning transducer shall be 20 to 25mm in diameter equivalent, for angle beam scanning, transducers shall be 8×9 mm2to 20×22 mm2. 3.6 Transducer frequency shall be 1 MHz to 5 MHz. Procedure For Ultrasonic Examination Page 5 of 12 Q/HA-A-002(2004） Revision 0 Date: 8/20/2004 华安检测 4.Surface Preparation 4.1 The base metal on each side of the weld shall be free of weld spatter, surface irregularities, or foreign matter that might interfere with the examination. 4.2 Where the weld surface interferes with the examination, the weld shall be prepared as needed to permit examination. 5.Stage of Examination If heat treatment is specified, the examination shall be carried out after the final heat treatment or if specifically requested after the pressure test. 6.Couplant The couplant may be cellulose gel. 7.Test Block 7.1 Basic calibration blocks shall be in accordance with the requirements of ASME, Section V, Article 5 figure T 542 2.1 for pressure vessels. a) Block selection: The material from which the block is fabricated shall be of the same product form, and material specification or equivalent P-Number grouping as one of the materials being examined. For the purposes of this paragragh, P-Nos. 1,3,4, and 5 materials are considered equivalent. For calibration blocks for dissimilar metal welds, the material selection shall be based on the material on the side of the weld from which the examination will be conducted: if the examination will be conducted from both sides, calibration reflectors shall be provided in both materials. Where two or more base material thicknesses are involved, the calibration block thickness shall be determined by the average thickness of the weld. b) Heat Treatment: The calibration block shall receive at least the minimum tempering treatment required by the material specification for the type and grade, and also a post weld heat treatment of at least 2 hr, if the calibration block contains weld(s) other than cladding. c) Surface Finish: The finish on the surface of the block shall be representative of the surface finishes on the components d) Block Quality: The calibration block material shall be completely examined with a straight beam search unit. Areas that contain an indication exceeding the remaining back reflection shall be excluded from the beam paths required to reach the various calibration reflectors 7.2 For examination of welds in material where the diameter is greater than 20 in. (508mm), a block of essentially the same curvature or alternatively, a flat basic Procedure For Ultrasonic Examination Page 6 of 12 Q/HA-A-002(2004） Revision 0 Date: 8/20/2004 华安检测 calibration block, shall be used. 7.3 The basic calibration block shall be curved for welds in materials with diameters of 20 in (508mm) and less. A single curved basic calibration block may be used to calibrate the examination on surfaces in the range of curvature from 0.9 to 1. 5 times the basic calibration block diameter. Procedure For Ultrasonic Examination Page 7 of 12 Q/HA-A-002(2004） Revision 0 Date: 8/20/2004 华安检测 8.Calibration of Instrument 8.1 For straight beam examination the control shall be set to 80% of full screen height by basic calibration block at the hole which gives the highest amplitude. 8.2 For angle beam examination the calibration shall meet the requirements of ASME, Section V, Article 4, Appendix B. 8.2.1 Distance-amplitude correction (primary reference level) (a) Position the search unit for maximum response from the hole which gives the highest amplitude. (b) Adjust the sensitivity control to provide an 80%(±5% of full screen height) of full screen indication from the hole. Mark the peak of the indication on the screen. (c) Position the search unit for maximum response from another hole indication. (d) Mark the peak of the indication on the screen. (e) Position the search unit for maximum amplitude from the third hole indication and mark the peak on the screen. (f) Position the search unit for maximum amplitude from the 3/4 T hole indication after the beam has bounced from the opposite surface. The indication should appear at sweep line 10. Mark the peak on the screen for 5/4T position. (g) Connect the screen marks for the side-drilled holes to provide the distance- amplitude curve. 8.2.2 Position calibration the following measurements may be made with a ruler, scale, or marked on an indexing strip. (a)Position the search unit for maximum response from the 1/4T hole. Place one end of the indexing strip against the front of the search unit, the other end extending in the direction of the beam. Mark the number 2 on the indexing strip at the scribe line which is directly above the hole. (If the search unit covers the scribe line, the marks may be made on the side of the search unit.) (b) Position the search unit for maximum indications from the 1/2 T and 3/4 T holes. Keep the same end of the indexing strip against the front of the search unit. Mark the numbers 4 and 6 on the indexing strip at the scribe line. (c) If possible, position the search unit so that the beam bounces from the opposite surface to the 3/4 T hole. Mark the number 10 on the indexing strip at the scribe line. (d) Position the search unit for the maximum opposite surface notch indication. Mark the number 8 on the indexing strip at scribe line. (e) The calibration numbers on the indexing strip indicate the position directly over the reflector in sixteenths of the V-path. (f)The depth from the examination surface to the reflector is T at 8,3/4 T at 6 and 10,1/2 T at 4, 1/4 T at 2, and 0 at 0. Interpolation is possible for smaller increments of the depth. This easement may be corrected by the radius of the hole if the radius is considered significant to the accuracy of reflector s location. 8.3 For angle beam examination, adjust the sensitivity control to equal to DAC Procedure For Ultrasonic Examination Page 8 of 12 Q/HA-A-002(2004） Revision 0 Date: 8/20/2004 华安检测 curve indication from the hole. Scanning sensitivity Level shall be performed at a gain setting of at least two times the reference level. 8.4 When any part of the examination system is changed, a calibration check shall be on the basic calibration block to verity that 1/4T,1/2T,and 3/4T points on the sweep and distance amplitude correction values recorded satisfy the requirement. 8.5A Calibration check on basic calibration block. A calibration check on at least one of the basic reflectors in the basic calibration block or a check using a simulator shall be made at the finish of each examination or series of similar examinations, every 4 hours during the examination and when examination personnel are changed. 8.6 Sweep Range Correction: If a point on the DAC curve has moved on the sweep line more than 10% of the sweep reading or 5% of full sweep, whichever is greater, correct the sweep range calibration and note the correction in the examination record. If reflectors are recorded on the data sheets, those data sheets shall be voided and a new calibration shall be recorded. All recorded indication since the last valid calibration or calibration check shall be reexamined with the corrected calibration and their values shall be changed on the data sheets. 8.7 DAC Correction: If a point on the distance-amplitude correction (DAC) curve has decreased 20% or2 dB of its amplitude, all data sheets since the last calibration or calibration check shall be marked void. A new calibration shall be made and recorded and area covered by the voided data shall be reexamined. If any point of the distance-amplitude correction (DAC)) curve has increased more than 20% or2 dB of its amplitude, all recorded indication since the last valid calibration or calibration check shall be reexamined with the corrected calibration and their values shall be changed on the data sheets. 8.8 The proper functioning of the examination equipment shall be checked and the equipment shall be calibrated by the use of the calibration standard at the beginning and end of each examination, when examination personnel are changed, and at any time that malfunctioning is suspected, as a minimum. If during any check it is determined that the testing equipment is not functioning properly, all of the product that has been tested since the last valid equipment calibration shall be reexamined. 9.Examination Coverage Each pass of the search unit shall overlap a minimum of 10% of the transducer dimension perpendicular to the direction of the scan. 10.Speed of Scanning The speed of scanning shall not exceed 6 in./s (150mm per second.) Procedure For Ultrasonic Examination Page 9 of 12 Q/HA-A-002(2004） Revision 0 Date: 8/20/2004 华安检测 11.Extent of Scanning 11.1 The scanning of the adjacent base metal shall be performed to detect reflectors that might affect interpretation of angle beam results, and is not to be used as an acceptance-rejection examination. Locations and areas of such reflectors shall be recorded. 11. 2 Wherever possible the scanning of the examination volume shall be carried out from both sides of the weld on the same surface. 11.3 The examination volume shall be scanned with angle beam search units directed both at right angles to the weld axis and along the weld axis. Wherever possible, each examination shall be performed in two directions, i.e. approaching the weld from opposite directions and parallel to the weld from opposite directions. These examinations shall be conducted using two beam angles from each direction (nominal angle of 45 and 60 degree or k1 and k2). 12.Evaluation of Reflectors 12.1 Evaluation of planar reflectors (a) Record all reflectors that produce a response equal to or greater than 20% of the distance- amplitude correction ( DAC). Record surface reflectors that produce a response equal to or exceeding the calibration amplitude which is the echo amplitude measurement from the surface notch in the basic calibration block. Record all search unit position and location dimensions to the nearest tenth of an inch. (b) Obtain data from successive scans at increments no greater than nine-tenths of the transducer dimension measured parallel to the scan increment change (10% overlap) . Record data for the end points as determined by 20% of DAC. Emphasis must be placed on measurement of the parameters determining the reflector length and height and the distances from the examination surface to the top and bottom of the reflector, since these dimensions are the factors most critical in determining ultimate evaluation and disposition of the flaw. (c) The following reflector data shall be recorded when a reflector exceeds 20% DAC. (1) Maximum percent of DAC, sweep reading of indication, search unit position, location along the length of the weld, and beam direction. (2) Through-wall Dimension (a) For reflectors 20% to 100% DAC, the minimum sweep reading and its position and location along the length of the reflector for 20% DAC when approaching the reflector from the maximum signal direction. (b) For reflectors 20% to 100% DAC, the maximum sweep reading and its position and location along the length of the reflector for 20% DAC when moving away from the reflector s maximum signal direction. Procedure For Ultrasonic Examination Page 10 of 12 Q/HA-A-002(2004） Revision 0 Date: 8/20/2004 华安检测 (c) For reflectors exceeding 100% DAC, minimum sweep reading and its position and location along the length of the reflector for 50% of the maximum amplitude when approaching the reflector from the maximum signal direction. (d) For reflectors exceeding 100% DAC, maximum sweep reading and its position and location along the length of the reflector for 50% of the maximum amplitude when moving away f