RE: [MW:5905] Uphill Vs Downhill Welding

Vertical progression is a non-essential variable, QW-405.3, for procedure qualification for general welding with most processes.  Therefore, for these WPSs while vertical progression must be addressed it does not require additional procedure qualification tests to change progression.

 

When impact testing is required by the design/construction code, Vertical welding with uphill progression must be qualified if it is going to be used in production (supplementary essential variable, QW-405.2).  This is because vertical – uphill welding tends to have the highest heat input and therefore have the greatest effect on impact properties of the HAZ and weld metal.

 

QW-405.4 only comes into play when specialized welding procedures for corrosion resistant overlay or hard facing overlay are required.

 

To those unfamiliar with using ASME Section IX, I give the following advice.  The list of variables contained in ASME Section IX, Article IV, Welding Data, do not stand alone.  The variables do not directly apply to welding in general and should not be quoted, imposed, or used independently.  In order to come into effect they must be specifically called out either for the process employed (See tables QW-252 through QW-265, QW-290.4) or for performance in QW-350 (see tables QW-352 through QW-357).  Article IV can be likened to a dictionary or encyclopedia,  it is simply a list of most of the standardized variables employed in Section IX .  Without specific selection, individually they have no application or meaning  just as random word in a dictionary or random article in an encyclopedia would likely be of use when you are searching for specific word or specific information.

 

 Note that some special situations may have a separate list of requirements or essential variables, as with, for example, QW-288 tube-to-tubesheet qualification by mock-up welding {applicable only if required by the design/fabrication Code}.  Or, as another example, if you using “buttering” or weld build up to avoid PWHT of the final joint you will have to meet the requirements of QW-283 in addition to the applicable process requirements in QW-350.

 

I hope this clarifies this issue for you.  Please let me know if you have further questions.

 

John

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of mahendran p
Sent: Thursday, July 08, 2010 6:33 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:5902] Uphill Vs Downhill Welding

 

Dear Bhavesh,                       Just to clear my doubts. The 405.3 mention it not mandatory, but in     405.4(d) mention need to requalify. Pls explain.   Thk u. P.Mahendran --- On Thu, 8/7/10, Bhavesh Patel <bhaveshpatel.me@gmail.com> wrote: From: Bhavesh Patel <bhaveshpatel.me@gmail.com> Subject: Re: [MW:5899] Uphill Vs Downhill Welding To: materials-welding@googlegroups.com Date: Thursday, 8 July, 2010, 12:22 PM Dear Harikrisnan,   It is not mandatory to do the welding in Uphill progression as per ASME Sec. IX.   See Clause No. QW-405.3 for better explanation.   If you change a progression in vertical welds then please check, is the welding consumable is recommended to weld in the same progression?   Check with respect to ASME Sec.II Part C.     Regards, BHAVESH PATEL Welding Engg. ISGEC, DAHEJ GUJARAT, INDIA On Thu, Jul 8, 2010 at 10:51 AM, <HarikrishnanS@punjlloyd.com> wrote: Dear Friends What is the criteria for selecting Uphill/Downhill weld progression in a Pipeline/Piping? Is it mandatory to use uphill progression in a WPS qualified under ASME Sec IX ? Thanks and Regards Harikrishnan N S Punj Lloyd Ltd, Mumbai They can, because they think they can....... --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- This e-mail and any files transmitted with it are for the sole use of the intended recipient(s) and may contain confidential and privileged information. If you are not the intended recipient of this communication, we request you to notify the sender immediately by return email and destroy all copies and the original message. Any unauthorized review, use, disclosure, dissemination, forwarding, printing or copying of this email is strictly prohibited. The recipient acknowledges that Punj Lloyd Limited or its subsidiaries and associated companies (collectively "Punj Lloyd Group") are unable to exercise control or ensure or guarantee the integrity of/over the contents of the information contained in e-mail transmissions and further acknowledges that any view, opinion or advice expressed in this message are those of the individual sender and no binding nature of the message shall be implied or assumed unless the sender does so expressly with due authority of Punj Lloyd Group. Although we have taken all reasonable precautions to ensure that this communication is free from viruses. We do not assume responsibility for any loss or damage arising from the use of this email. -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.   -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

 

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.