{"id":902,"date":"2022-01-14T11:40:52","date_gmt":"2022-01-14T11:40:52","guid":{"rendered":"https:\/\/mewelding.com\/?p=902"},"modified":"2022-09-21T03:15:59","modified_gmt":"2022-09-21T03:15:59","slug":"heat-input-on-wps","status":"publish","type":"post","link":"https:\/\/mewelding.com\/heat-input-on-wps\/","title":{"rendered":"Practice Case 12 – Heat Input On A WPS"},"content":{"rendered":"\n

This article studies an example of two procedure qualifications with different heat inputs, qualified on different base metal thicknesses<\/a>. How does one go about when applying these PQRs to a single production weld joint. How to reckon heat input on a WPS in such situation?<\/p>\n\n\n\n

\"heat<\/figure>\n\n\n\n

Consider the following questions asked in Interpretation <\/a>IX-92-87.<\/p>\n\n\n\n

\u201cBackground: Two PQRs have been qualified to support a WPS with notch toughness requirements <\/a>and having a qualified base metal thickness range from 5\/16 in. to 2 in. inclusive. One PQR was qualified on 1 in. thick material with a maximum heat input of 85000 J\/in. The second was qualified on 5\/16 in. thick material with a maximum heat input of 45000 J\/in. All other essential and supplementary essential variables<\/a> are the same.<\/p>\n\n\n\n

Question (1): Is this WPS qualified for using 85000 J\/in. max. Heat input on thicknesses 5\/16 in. to 2 in.?<\/p>\n\n\n\n

Question (2): Is the heat input value of 85000 J\/in. applicable to base metal thicknesses between 5\/8 in. to 2 in. and the heat input value of 45000 J\/in. applicable to base metal thicknesses between 5\/16 in. and 5\/8 in.?\u201d<\/p>\n\n\n\n

Let us summarize the given information in a table for easy reference:<\/p>\n\n\n\n

 <\/strong> PQR 1<\/strong><\/td>Actual value in test coupon<\/strong><\/td>Range Qualified<\/strong><\/td><\/tr>
   Heat Input<\/td>  85000 J\/in.<\/td>  85000 J\/in. maximum.<\/td><\/tr>
   Thickness  <\/td>  1 in.<\/td>  5\/8 in. to 2 in.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
 <\/strong> PQR 2<\/strong><\/td>Actual value in test coupon<\/strong><\/td>Range Qualified<\/strong><\/td><\/tr>
  Heat Input<\/td>  45000 J\/in.<\/td>  45000 J\/in. maximum.<\/td><\/tr>
  Thickness  <\/td>  5\/16 in.<\/td>  5\/16 in. to 5\/8 in.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n


When impact is a consideration, QW 409.1 limits the heat input to a maximum equalling that used in the procedure qualification test coupon. The range qualified for heat input shown in the above tables is therefore, in deference to the QW 409.1. <\/p>\n\n\n\n

And, QW 403.6 governs the minimum base metal thickness qualified.<\/a> The minimum base metal thickness qualified is equal to the test coupon thickness if the test coupon is less than 5\/8 in., and equal to 5\/8 in. if the test coupon thickness is more than 5\/8 in. The lower value indicated under range qualified for thickness in tables above is therefore in accordance with QW 403.6. <\/p>\n\n\n\n

The maximum base metal thickness qualified is of course 2T (T = test coupon thickness), as stipulated by QW 451.<\/p>\n\n\n\n

Now, Section IX permits us in QW 200.2 to use multiple PQRs for supporting a single WPS. It is important to know that this does not permit us to mix<\/em> two PQRs for a single weld at a time. <\/p>\n\n\n\n

For example, a WPS can be written for several P-Number combinations<\/a> if a supporting PQR is available for each combination. Likewise, a WPS can be written for a wide range of base metal thickness if a supporting PQR is available for each portion of the thickness range.<\/p>\n\n\n\n

However, for one weld at a time, all essential variables (and supplementary variables, if applicable) should have come from a single PQR. In other words, when the arc is struck, all the variables involved should have support from only a single PQR. It is not permissible that some variables are supported by one PQR, and some other variables are supported by another PQR.<\/p>\n\n\n\n

Related article: Multiple Welder Qualifications Through Single Test Coupon<\/a><\/p>\n\n\n\n

With the above in mind, examine the two PQRs listed in tables above, and consider question 1.<\/p>\n\n\n\n

The heat input of 85000 J\/min can only be applied for thickness range qualified by PQR 1. Since the 5\/16 in. to 5\/8 in. thickness range falls outside the qualified range of PQR 1, the answer to the question 1 is \u2018No\u2019.<\/p>\n\n\n\n

The inquirer is probably aware of the understanding discussed in above paragraphs, and has worded his second question in such a manner that a \u2018yes\u2019 answer from will reaffirm the understanding. The ASME\u2019s answer to question 2 above has been given as \u2018yes\u2019.<\/p>\n\n\n\n

It is interesting how, after understanding ASME\u2019s proclivity towards giving \u2018yes\u2019 or \u2018No\u2019 answers, the Inquirers have grown smart enough to word their questions in such a way that a yes or no answer would sufficiently address the issue at hand. The question 2 above is a good example of this.<\/p>\n\n\n\n

So this was about how to go about reckoning heat input on WPS when it is supported by two PQRs, qualified on different base metal thicknesses, and different heat inputs.<\/p>\n\n\n\n

See More:<\/p>\n\n\n\n

<\/a>A-Number On A WPS<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

This article studies an example of two procedure qualifications with different heat inputs, qualified on different base metal thicknesses. How does one go about when applying these PQRs to a single production weld joint. How to reckon heat input on a WPS in such situation? Consider the following questions asked in Interpretation IX-92-87. \u201cBackground: Two … Read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"footnotes":""},"categories":[117],"tags":[119],"yoast_head":"\nPractice Case 12 - Heat Input On A WPS - mewelding.com<\/title>\n<meta name=\"description\" content=\"How to apply 2 PQRs, qualified with different heat input & on base metals of different thickness, to a weld? 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