Materials & Welding

This bulging is due to restricted movement of the parts being post weld heated during PWHT . Due to restraints at the end of the  pipes, the bulging might have taken place. Also pl note  that PWHT temperature is a bit high ie 750 - 760 Deg C for GR 91   as compare of GR 22 , GR 11 ETC On Tuesday, November 24, 2015 at 2:07:20 PM UTC+5:30, pradipsil wrote: Dear Expert, In P91 Material ( HRSG header Joint ) after pwht one joint is bulge.We did  Preheating ,Welding , Post Heating,& PWHT in proper way. Can anybody explain why this bulge occurs & remedy. During fit-up inspection & weld visual inspection all round the joint is perfect but after PWHT pipe is bulge 140 mm away from the   weld ment Pic Attached Regards, Pradip -- You received this message because you are subscribed to the Google Groups "Materials & Welding" group. To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.c...

if the breaking  tensile strength is more than the base metal, then no problem In PQR , write that "Fracture in Weld " that's all On Sunday, November 8, 2015 at 9:43:31 AM UTC+5:30, ahmed boh wrote: Hi, I am working in pipeline project API1104. I heve one speciemen breaks on the weld in tension test for mechanized welding operator with filler metal and the tension strength was greater the SMTS.  pls advise what we should do in this case? ahmed -- You received this message because you are subscribed to the Google Groups "Materials & Welding" group. To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com . To post to this group, send email to materials-welding@googlegroups.com . Visit this group at http://groups.google.com/group/materials-welding . To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/8341587f-4c0f-457f-8cdf-0b2e90...

Dear Experts , We intend to use SA 516 GR 70 plate - (thickness ranging from  55mm to 100 mm)  for   steam boiler application. We are getting plates with Niobium content of 0.04 %. As per SA 20   corresponding table ,the maximum limit for Nb  is 0.02 % How ever , in the notes of the said Table  the Nb can be increased What is effect of increase,  in Nb element on boiler drum shell rolling and  welding -- You received this message because you are subscribed to the Google Groups "Materials & Welding" group. To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com . To post to this group, send email to materials-welding@googlegroups.com . Visit this group at http://groups.google.com/group/materials-welding . To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/05cb8aec-9be2-45e2-8d97-57c1b2dae3b7%40googlegroups.com . For more options, visit htt...

Dear experts Can anyone send me the microstructure for A 106 Gr B. I have to prepar a mini projet of the welding of this material. Cordialement Envoyé depuis un mobile Samsung

Dear Mr. Pushpraj, Since ASME & TEMA does not specifiy tube wall thickness reduction limit, for C.S. materials 8-10% thinning is recommended as per Good Engg. Practice and reputed PMC spec. Thanks & regards, C. R. GANDHI From: Madhan S <madhan0890@gmail.com> To: Materials & Welding <materials-welding@googlegroups.com> Sent: Tuesday, November 17, 2015 9:11 AM Subject: [MW:23889] Re: Allowable Tube Wall Reduction Tube-to-Tubesheet Joints expended in 2 grooves and seal welded Dear Pushpraj Formula for tube expansion, D=d+e+t D- Tube ID after expansion. d- Tube ID before expansion. e- Clearance between tube OD and Plate ID t- Applied Diameter expansion is 0.6 mm. (0..6mm Use can change depending on your groove depth.) In your case you have seal welding also. So Don't worry for leakage. With Regards, Madhan. S On Monday, November 16, 2015 at 7:54:08 AM UTC+3, Anand wrote: Dear experts  Please let me know the Allowable Tube Wall Reduction Tub...

Dear all, We know that as per asme, when impact applicable clause 403.6 use for thickness limitation. I hve wps with 4.8mm to 19mm Mat api 5l x52. without impact test. For another project there is impact requirement. Wd conduxt impact test and accepted. Now is there change in thk range.? I dint found in api 1104. -- You received this message because you are subscribed to the Google Groups "Materials & Welding" group. To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com . To post to this group, send email to materials-welding@googlegroups.com . Visit this group at http://groups.google.com/group/materials-welding . To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CANX-_HGFU2ixDxG0rX90-LnVUaex7RmHboM4bN-R5_PiHEOdxQ%40mail.gmail.com . For more options, visit https://groups.google.com/d/optout .

Dear Mr. Alan  Thermo-mechanical controlled processed micro allying steel resist the dislocation motion for certain period of time but shows the Luders band of yeild point in very short area.  Recently, new methods have been started to be used for investigation of plastic flow of metals such as thermography please see the attachement of ; 1) Influence of Niobium on the Beginning of the Plastic Flow of  Material during Cold Deformation.   2) For reference 3% Ni steel -Normalised+ Acc. Cooled+ Tempered.( Its shows the Yeild point) Please clarify your suggestion On Monday, November 16, 2015 at 1:32:48 PM UTC+3, alan wrote: I have to comment, since  I do not agree that 'the yield point is observed in all carbon steel material'  [but it may depend on what you consider to be a carbon steel]. That statement is probably true for as-rolled and normalised carbon steels but, notably, the TMCP [thermo-mechanical controlled processed] steels which are carbon-manganese micro-alloyed steels a...

Yes, We will get reducing flanges, in sulfur lines we will be using and in chilled water/brine water jacketing also used. On Wed, Nov 25, 2015 at 11:17 PM, PRASANTH RAJAN < prasanthgalfar@gmail.com > wrote: Dear experts       Is it possible for welding of jacket outer pipe on the  the inner pipe flange , its there any standard that allow the welding of pipe in forged material -- WITH REGARDS   *PRASANTH RAJAN* *MECHANICAL SUPERVISOR* *GALFAR ENGINEERING EMIRATES* * prasanthgalfar@gmail.com * < prasanthgalfar@gmail.com >   -- You received this message because you are subscribed to the Google Groups "Materials & Welding" group. To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com . To post to this group, send email to materials-welding@googlegroups.com . Visit this group at http://groups.google.com/group/materials-welding . To view this discussion on the web visit htt...

Yes it is, the flanges are to be prepared accordingly. From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> on behalf of PRASANTH RAJAN <prasanthgalfar@gmail.com> Sent: 25 November 2015 07:17 To: materials-welding@googlegroups.com Subject: [MW:23926] Jacket piping   Dear experts       Is it possible for welding of jacket outer pipe on the  the inner pipe flange , its there any standard that allow the welding of pipe in forged material -- WITH REGARDS   *PRASANTH RAJAN* *MECHANICAL SUPERVISOR* *GALFAR ENGINEERING EMIRATES* * prasanthgalfar@gmail.com * < prasanthgalfar@gmail.com >   -- You received this message because you are subscribed to the Google Groups "Materials & Welding" group. To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com . To post to this ...

Dear Sir, I already discussed with heat Treater regarding this matter & found thermocouple is placed in the middle so there is no overheating Chances.  Thermocouple Photo Attached. We have Thermocouple & recorder calibration certificate. Regarding the question of overheating/Overlapped the Heating band...... the joint is painted there is no color difference of the particular area of the heating band/ Bulge Area. Although machine will show that if it is overheated. My question is all spool ( Eight Nos & each spool has two nos of joint ) is a common header ( Header weight is 6,3 Ton) downside is locked in the another header. Is it possible there is no expansion area of the joint & so the pipe is expanded at side ?  Regards, Pradip On Thu, Nov 26, 2015 at 9:48 AM, pgoswami < pgoswami@quickclic.net > wrote: Pradip,   Something definitely had gone wrong with the PWHT process causing the headers to bulge. I've tried to put all o...

Pradip,   Something definitely had gone wrong with the PWHT process causing the headers to bulge. I’ve tried to put all of your back and forth correspondence in one place. The root cause analysis looks to me are as follows:-   The PWHT temperature is not very clear, but something in the vicinity of 760-780 Deg C and of 2hrs of soaking time for ½” wall thickness is high. Please follow Sec-I guidelines (as below) The PWHT chart should be very clear. It’s not clear from the PWHT chart what was the temperature adopted vs the soaking time .Needs to be specified in the chart I’m not sure, but from the hand drawn sketch, it looks two heating pads were overlapped. If so it definitely would add to overheating . It’s not a mandatory requirement. However   as per D-10.10 it’s advisable to place additional thermocouples in the soaking and heating zone to monitor...

Dear experts       Is it possible for welding of jacket outer pipe on the  the inner pipe flange , its there any standard that allow the welding of pipe in forged material -- WITH REGARDS   *PRASANTH RAJAN* *MECHANICAL SUPERVISOR* *GALFAR ENGINEERING EMIRATES* * prasanthgalfar@gmail.com * < prasanthgalfar@gmail.com >   -- You received this message because you are subscribed to the Google Groups "Materials & Welding" group. To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com . To post to this group, send email to materials-welding@googlegroups.com . Visit this group at http://groups.google.com/group/materials-welding . To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAKCULh5fjVmbvFdPkmqpg3%3DB1WNAU9v%2BfB_bkoML1p-1oiXD6w%40mail.gmail.com . For more options, visit https://groups.google.com/d/optout .

How we will calculate  allowable stress the stress value at the PwhT temperature by using Euler Case On Wed, Nov 25, 2015 at 11:58 AM, < george.dilintas@gr.bureauveritas.com > wrote: Why you do not perform a calculation using as allowable stress the stress value at the PwhT temperature? Consider the Euler case which is closer to your configuration Sent from my BlackBerry 10 smartphone. ...