Materials & Welding

Dear MPK, Copper is one of the elements which causes HOT CRACK. There are two types of Hot Crack 1. Solidification Cracks: Occurs in the Weld Metal (Usually along the centerline of the weld) as a result of the solidification process. 2. Liquation cracks: Occurs in the course grain HAZ, in the near vincity of the fusion line as a result of heating the material to an elevated temperature, high enough to produce liquation of the low melting point constituents placed on grain boundaries. Weld bead solidification started above 1400 deg C, and the melting points of copper is near 1100 deg C. This is the basic reason. On Tue, Nov 29, 2011 at 7:02 PM, mpk mpk < ranmi2007@gmail.com > wrote: > Dear Experts, > > What is the Root cause for copper crack in SAW welding ? > > thanks, > > MPK > > -- > To post to this group, send email to materials-welding@googlegroups.com > To unsubscribe from this group, send email to > materials-welding+unsubscribe@googlegro...

Dear Experts,   why phenumatic test is more critical than hydro test?   Thank you, MPK -- 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.

Short answer is no.  The combination referred to in 200.2 (f) is for a single process with PQRs on performed on multiple thicknesses.   John A. Henning Welding & Materials   From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of sevak hiren Sent: Wednesday, November 30, 2011 6:58 AM To: materials-welding@googlegroups.com Subject: Re: [MW:13116] QW-200.4   Thanks for explaination, so what does the clause QW-200.1 (f)  mean ? Can't we apply this clause to combine two different processes ?     On Wed, Nov 30, 2011 at 9:59 AM, manpreet < manpreetsin88@rediffmail.com > wrote: Hi Aly,   Below is interpretation based on Mr. John's wonderful explanation to me in this forum:-   Aly's interpretation is correct based on QW-200.4 (b) but if base metal thickness are lesser than 13mm, QW-200.4 (b) does not apply and below would be the answer:-   PQR 1- 1.5mm to 12mm PQR 2- 5mm to 30mm ...

Dear, I think you should go for ERNiCu7/ENicu7 consumable. Special metal electrode performance is better than others. Regards, VJ On Wed, Nov 30, 2011 at 3:04 PM, MUHAMMAD SHAHZAD < shehzadqc@gmail.com > wrote: Dear Sir I want to weld Inconel 625 (P No. 43) to 70Cu-30Ni alloy (P No.34) which welding Rod/Electrode is the most suitable for GTAW/SMAW process. -- Muhammad Shahzad Materials & Corrosion Engineer Arabian Petrochemical Company (Petrochemya/Sabic) -- 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-weldi...

Thanks for explaination, so what does the clause QW-200.1 (f)  mean ? Can't we apply this clause to combine two different processes ?     On Wed, Nov 30, 2011 at 9:59 AM, manpreet < manpreetsin88@rediffmail.com > wrote: Hi Aly, Below is interpretation based on Mr. John's wonderful explanation to me in this forum:- Aly's interpretation is correct based on QW-200.4 (b) but if base metal thickness are lesser than 13mm, QW-200.4 (b) does not apply and below would be the answer:- PQR 1- 1.5mm to 12mm PQR 2- 5mm to 30mm Qualified base metal range: 5mm to 12mm ( 1.5mm < T1 < 12mm, 5mm < T2 < 30mm ) Maximum Qualified GTAW deposit: 12mm Maximum qualified SMAW deposit: 12mm QW-200.4 (a) allows you to combine these two PQR's to support a single WPS. In such a case the WPS will be restricted to the minimum range qualified by the PQR base metals (per QW-451); i.e. the intersection of the two individual qualified ranges . QW-200.4(b) is an ...

jamil, the weld reinforcement depends on the weld thickness and the same can be found in table 341.3.2 of B31.3. On Wed, Nov 30, 2011 at 3:21 PM, md jamil ahmad < jamilmech2009@gmail.com > wrote: Dear All,           Any body explain me,1) what is the minimum acceptance criteria for out side weld reinforcement for power piping or process piping           I think,in general 1.6 to 3mm,is it correct or not.          2) In inside welding of pipe what is the minimum and maximum reinforcement criteria,please tell me as per ASME Code. REGARD JAMIL AHMAD KSA -- 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 co...

dear friend u must check the reinforcement as per wps. you are right, in general it is 1.6 to 3 mm,but cap reinforcement can be more(i.e 4mmm) in thicker pipes or plates. regard Mehdi Emami From: md jamil ahmad <jamilmech2009@gmail.com> To: materials-welding@googlegroups.com Sent: Wednesday, November 30, 2011 1:21 PM Subject: [MW:13113] Minimum acceptance criteria for weld reinforcement for pipe and plate Dear All,           Any body explain me,1) what is the minimum acceptance criteria for out side weld reinforcement for power piping or process piping           I think,in general 1.6 to 3mm,is it correct or not.          2) In inside welding of pipe what is the minimum and maximum reinforcement criteria,please tell me as per ASME Code. REGARD JAMIL AHMAD KSA -- To post to this group, send email to materials-welding@googlegroups....

Dear All,           Any body explain me,1) what is the minimum acceptance criteria for out side weld reinforcement for power piping or process piping           I think,in general 1.6 to 3mm,is it correct or not.          2) In inside welding of pipe what is the minimum and maximum reinforcement criteria,please tell me as per ASME Code. REGARD JAMIL AHMAD KSA -- 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.

Dear Sir I want to weld Inconel 625 (P No. 43) to 70Cu-30Ni alloy (P No.34) which welding Rod/Electrode is the most suitable for GTAW/SMAW process. -- Muhammad Shahzad Materials & Corrosion Engineer Arabian Petrochemical Company (Petrochemya/Sabic) -- 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.

Dear Sirs,   Thanks a lot for your kind advices. As we do not know original bolt specification, finally we conducted hardness test. Base on both PMI result and hardness test result, we choose the nearest one.   Thanks again and best Rgds,   WN   From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Fitria Rahman Sent: Wednesday, November 30, 2011 6:10 AM To: materials-welding@googlegroups.com Subject: Re: FW: [MW:13105] Type of steel as per chemical proterties   Hi Naing What I suggest here is get the chemical composition from your bolt specification and compare the PMI result (I did before with Metorex Arc Met-930) against the chemical composition from the specification. Now you can determine is it conform or not. I was always thought that we can not claim the material fall under YYY specification. Only manufacturer has the authority to make a judgment that the material fall under...

Dear Sir, Thanks for your valued expert advice. As per ASME SEC V  T-290, no where is mentioned about thickness wise as well as diameter wise only technique wise. If i make only technique wise, is that any violation as per ASME SEC -V Thanks Pradip  On Tue, Nov 29, 2011 at 10:42 PM, Raju Kandula < rgkandula@gmail.com > wrote: Dear Pradip..       technique as well as diameter and thickness is right..  the essential variables that has to be noted on the docimentation, changes corresponding to diff daiameter adn the thickness... like iqi selction and the no of films used and the location length, so it wil be easy and prefer to do documentation as per diamter and thickness so it is easy for some one to understand the documentation and easy to trace for future referance...   regards raju kandula On Tue, Nov 29, 2011 at 9:14 AM, pradip kumar sil < pradipsil@gmail.com > wrote: Dear Experts, As per ASME Sec. V T-290 shows radiographic technique documentation de...

Dear, This is very tricky welding you can use ER NiCr-3 and ENiCrFe-3 consumables. again it depends on which P45 material you are using. but during welding make sure that dilution of SS side base metal is minimum to avoid micro cracks. Regards, VJ On Wed, Nov 30, 2011 at 10:58 AM, Madhu < madhusudan.rout@gmail.com > wrote: Dear All,             For    P45 to P8 material welding, which type consumable can be use,                     For SMAW/GTAW process. Thanks. -- 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 materi...

Dear All, For P45 to P8 material welding, which type consumable can be use, For SMAW/GTAW process. Thanks. -- 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.

Hi MPK   I would like to share one practical example from my past assignments. In UT after SAW welding of CS, we were getting fine cracks. The WPS was religiously followed and we were confused !   After lot of investigation we found out that our welding operator had made short the SAW nozzle during welding which had caused copper contamination in the weld and resulted in cracks.   Regards   Prem Nautiyal Mobile     +91 9004063879 / 9769316004     --- On Wed, 11/30/11, pgoswami@sympatico.ca <pgoswami@sympatico.ca> wrote: From: pgoswami@sympatico.ca <pgoswami@sympatico.ca> Subject: RE: [MW:13103] what is the root cause for copper crack in saw welding ? To: materials-welding@googlegroups.com Date: Wednesday, November 30, 2011, 9:22 AM  Hi MPK,     It's a form of solidification cracking caused  due to localized segregation of low melting elements. Copper is one of the elements which tends ...

Hi Aly, Below is interpretation based on Mr. John's wonderful explanation to me in this forum:- Aly's interpretation is correct based on QW-200.4 (b) but if base metal thickness are lesser than 13mm, QW-200.4 (b) does not apply and below would be the answer:- PQR 1- 1.5mm to 12mm PQR 2- 5mm to 30mm Qualified base metal range: 5mm to 12mm ( 1.5mm < T1 < 12mm, 5mm < T2 < 30mm ) Maximum Qualified GTAW deposit: 12mm Maximum qualified SMAW deposit: 12mm QW-200.4 (a) allows you to combine these two PQR's to support a single WPS. In such a case the WPS will be restricted to the minimum range qualified by the PQR base metals (per QW-451); i.e. the intersection of the two individual qualified ranges . QW-200.4(b) is an exception to the general rules for root pass process qualified with a PQR with base metal thickness > 13mm, and a second PQR for a fill process qualified with a base metal thickness greater than the base metal thickness used with the root pass PQR.One e...

 Hi MPK,     It's a form of solidification cracking caused  due to localized segregation of low melting elements. Copper is one of the elements which tends to form so, for C.S and high strength and medium strength low alloy steels.   Please see the reference below.   Thanks.   P.Goswami,P.Eng,IWE   http://content.lincolnelectric.com/pdfs/knowledge/articles/content/weldcracking.pdf   Date: Tue, 29 Nov 2011 16:32:37 +0300 Subject: [MW:13100] what is the root cause for copper crack in saw welding ? From: ranmi2007@gmail.com To: materials-welding@googlegroups.com Dear Experts, What is the Root cause for copper crack in SAW welding ? thanks, MPK -- 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 ...

Hi Naing What I suggest here is get the chemical composition from your bolt specification and compare the PMI result (I did before with Metorex Arc Met-930) against the chemical composition from the specification. Now you can determine is it conform or not. I was always thought that we can not claim the material fall under YYY specification. Only manufacturer has the authority to make a judgment that the material fall under - let's say A105.  Rgds 2011/11/28 Abdul Hafeez < hafeezrabi@hotmail.com > Dear, Use latest equipment optical emission spectrograph, so u can all elements even lighter than sulpher. Match results with ASME II . -----Original Message----- From: Abdul Hafeez Sent:  28/11/2011 10:38:28 am Subject:  RE: [MW:13077] Type of steel as per chemical proterties use optical emission spectrgraph for PMI and compare results with ASME sec II Part A or B. Regards, Abdul Hafeez -----Original Message----- From: c.nopadon@vipco-thai.com Sent:  27/11/2011 ...

Dear Pradip..       technique as well as diameter and thickness is right..  the essential variables that has to be noted on the docimentation, changes corresponding to diff daiameter adn the thickness... like iqi selction and the no of films used and the location length, so it wil be easy and prefer to do documentation as per diamter and thickness so it is easy for some one to understand the documentation and easy to trace for future referance...   regards raju kandula On Tue, Nov 29, 2011 at 9:14 AM, pradip kumar sil < pradipsil@gmail.com > wrote: Dear Experts, As per ASME Sec. V T-290 shows radiographic technique documentation details needs only each technic wise i.e single wall/ double wall. But client demanded each technique wise as well as diametre & thickness wise . My question is which one is correct either technique wise or technique as well as diametre & thicknesswise. Thanks in advance. Regards Pradip -- To post to this group, send email to mate...

No need to combine two WPS if you don't want benefit thickness of BM, you can use more one WPS in a single joint,if your WPS is qualified for BM thickness..   Mhaskar Aly         -------Original Message-------   From: sevak hiren Date: 29/11/2011 11:27:06 To: materials-welding@googlegroups.com Subject: Re: [MW:13084] QW-200.4   Dear Sir,   Thanks for reply, but apart from your expaination, please let me know can we combine two existing WPS of different processes (Say GTAW & SMAW) of less than 13 mm thk in a single production joint as per QW-200.1 (f) ? On Sun, Nov 27, 2011 at 10:41 PM, Aly < mhaskar.aly@gmail.com > wrote: Advantage of combining two processes:   Suppose u have two wps as below   1: WPS with GTAW with 13mm base plate thickness (Base metal Qualification range is 26mm max)    2:WPS with SMAW with 20mm base plate thickness (Base metal Qualification ra...

Hi,  Contrast, definition, detail etc. are qualitative(can not be measured) term , whereas, Density is a quantitative (can be measured) term. Following is the extraction from www.ndt-ed.org , which may be helpful to you. Radiographic contrast describes the differences in photographic density in a radiograph. The contrast between different parts of the image is what forms the image and the greater the contrast, the more visible features become. Radiographic contrast has two main contributors: subject contrast and detector or film contrast. Subject contrast is determined by the following variables: - Absorption differences in the specimen - Wavelength of the primary radiation - Scatter or secondary radiation Film contrast is determined by the following:  - Grain size or type of film - Chemistry of film processing chemicals - Concentrations of film processing chemicals - Time of development - Temperature of development - Degree of mechanical agitation (physical motion...

Dear Experts, What is the Root cause for copper crack in SAW welding ? thanks, MPK -- 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.

Dear Ali, We can use original service gaskets in locations other than reinstatement flanges @ test boundaries. For reinstatement flanges we can use any other because we will reinstate the original. Muthusamy UAE On 28 November 2011 20:49, Aly < mhaskar.aly@gmail.com > wrote: Dear Experts, Could you please advise on whether to use original service gaskets for hydro testing or any other gasket ca be used?   Thanks in advance.   Mhaskar Aly UAE -- 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 materia...