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Review 审查 of WPS PQR.pdf

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    Review 审查 of WPS PQR
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    API Preparatory Class Lesson 15 Review of WPSs and PQRs The API candidate will be given a WPS and a PQR and will be asked to identify errors or unsupported requirements. Questions will be asked about individual blocks on the WPS/PQR. You will not be required to review the entire document. The exam is in multiple choice format, normally 3 to 6 questions come from the WPS/PQR review. When answering the questions about the WPS and/or the PQR, look for omitted information. Every Essential and Nonessential variable should be addressed. Common errors, such as filler metal F-Numbers and base metal thickness ranges are typically found. The PQR test coupon thickness T can and often does support only part of the thickness range stated on the WPS etc. Review of the WPS and PQRs The API Body of Knowledge has limited the content of the WPS and PQR in the following key ways. 1. There will be only one welding process, and they have been limited to SMAW, GTAW, GMAW or SAW. 2. Just one filler metal i.e. all E-7018 with no mixing of F- Numbers. 3. There will not be different thickness or different base metals welded to each other. 4. The P-Numbers are limited to P1, P3, P4, P5 and, P8 5. For P1, P3, P4, and, P5 the lower transition temperature is 1,333 o F and the upper is transformation is 1600 o F Limitations on the WPS/PQR Review Limits Continued: 6. Supplemental powdered fillers or consumable inserts will not be on the WPS/PQR. 7. Special welding processes such as corrosion resistant weld metal overlay and hard surfacing will not be present. 8. Welds with buttering of the ferritic member or excluded. In short the WPS/PQR review will be of the most basic type, and will not require a great deal of expertise in Section IX. Limitations on the WPS/PQR Review 1. Missing variables, both Essentials and Non-Essentials on the WPS. 2. Missing Essential variables on the PQR, Non-Essentials are not required for the PQR. 3. Incorrect Essential Variables, such as the wrong F- Number for a filler metal or electrode. For example: “The electrode E-6010 has an F-Number of 3 and often the wrong F-Number is assigned to it such as F-Number 4” 4. An Essential Variable listed on the WPS that is not supported by the PQR. Note:Editorial mistakes such as misspellings of company names or typing errors are excluded from the exam. i.e. WPS/PQR Mistakes are of Four Types We will use the SMAW QW-253 Brief of Variables as a check list as we go through the reviews of two WPS and PQRs. Confusion Welding and Wee Welders Turn now to Page 21 of Section IX and remove it for convenience during the review. Brief of Variables The first checks are in the title of the WPS. 1. Does our WPS reference our PQR? 2. Has our welding process been listed? 3. Is the Type of welding listed, manual, automatic etc.? * Note: The Type of Welding in box QW-410 at the bottom of QW-253 is out of order in reference to the box on the WPS, as it appears in the title instead of box QW-410 on the WPS. Confusion Welding WPS Conclusion: 1. WPS references our PQR. 2. Our welding process is listed. 3. Type of welding is listed as manual. No mistakes in the title page. Confusion Welding WPS Next we compare the variables in the row QW-402 Joints on QW-253 to the box QW-402 Joints on the WPS. 1. Groove design, is it addressed? 2. Backing has it been listed? 3. Has root spacing been detailed? 4. Finally have retainers been mentioned? Confusion Welding WPS For definitions see Page 56 of Section IX. 402.1 - A Change in Groove Design 402.4 - Deletion/Removal of Backing 402.10 - A Change in Root Spacing 402.11 Addition or Removal Retainers We go line by line checking the WPS 1/2” been addressed? * Note: During the review of the PQR we will confirm that all Essential Variables are in agreement between the WPS and the PQR regarding the specifications and ranges supported. Confusion Welding WPS Confusion Welding WPS Conclusions: 1. The P-Number is present. 2. Base metal thickness range is present. 3. t pass 1/2” is missing, not addressed! This is a mistake, as all essentials variables must be addressed. * Remember, all variables that apply to the process must be addressed on the WPS, both essential and non-essential. Confusion Welding Check the box QW-404 on the WPS for omissions. 1. Is the F-Number present and is it correct? 2. Is the A-Number present? 3. Diameter of electrodes allowed? 4. The range of weld metal t ? 5. AWS Classification how about it? You may remember from our previous lesson that A-Numbers cannot be correctly identified without Section II Part C of the ASME Code. So we can only check for its presence on the form. Confusion Welding Confusion Welding WPS Everything on the list is present, but is the Essential Variable F-Number correct? We cant check the A- Number without Section II Part C. Turn to Page 132 and look at the F-Numbers. Check the F-Number for E-7018 which appears under the title E-XX18. Confusion Welding Conclusions: 1. The F-Number is present but wrong! 2. The A-Number
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