Materials & Welding

Few days ago i came across UOP specification 8-11-12-Piping , which asked radiography of socket / branch welds for low alloy steel/SS. If somebody has done project with UOP in past, pl share their experience. Also i read one very old B 31.3 Interpretation: 5-13 for the radiography of socket welds as below... Subject:ANSI/ASME 831.3-1984 Edition, With the ANSI/ASME 831.3a-1984 Addenda, Table 327.4.1A, Limitations on Imperfections in Welds-Internal Porosity  Date Issued: December 2, 1986 Question (1): In ANSI/ASME 831.3, Table 327.4.1 A, under internal porosity forfillet, socket, seal and reinforcement attachment welds, the wording NA (not applicable) is indicated. Does this mean that radiographic examination is not required for this type of joint configuration? Reply (1): Yes. In my opinion, RT of SW is only performed to detect the gap between two components, also in past during some corossion isometric study, we have assigned TML (thikness monitoring location) to carry out RT of S...

Hi All Can u pls guide me which section of EEMUA 158 :1994 gives details of the positions and progressions qualified by welding 2G & 3G , UPHILL? Please quote the reference paragraph number from the standard. Also where can I find the values for interpass temperature in the standard? (5.3.3 is clear about preheat, but does not gives much details about interpass temperature, the material is carbon steel, CE:m 0.46,) BR -- 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.

2H nuts shall not be welded to any pressure parts ( see UCS 4 or 5 of ASME Sec VIII Div 1 ) as it contains more than 0.35% Carbon. arun On Tue, Nov 30, 2010 at 2:42 PM, Shadab Alam Ansari < ansari@ghi.com.sa > wrote: Dear All, Which P. no shall be assigned to weld Nuts of SA-194 grade 2H? Please provide your valuable comments.   Regards Shadab -- 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. -- அருணாசலம் கலைவாணி சுதர்ஷனா வருண் -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group...

Molybdenum increases the resistance to pitting and crevice corrosion in Chloride environment. It supports the Chromium oxide layer and helps in re passivation, if the layer is broken BR On Tue, Nov 30, 2010 at 10:28 AM, Shiv Dutt Mishra Mishra < gopu301182@gmail.com > wrote: Dear All, Can you tell me what is the importance of '' MO"(molybdenum) content in SS316L materials. -- Thanks, S.D.Mishra Mob- 09589444897 (M.P./C.G.)         09766916581 (Maharastra) -- 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 m...

As defect observed in RT, so pl.rectify the defect with cutting of that portion and again do the welding and than do the heat treatmentagain.And for test piece once u can do the heat treatment only of test piece and again do the heat treatment with product. Than send tht test piece for testing and if it is ok with RT and mechanical testing than we can accept tht.   Regards,   Mahek shah L&T  On Sat, Nov 27, 2010 at 12:30 PM, yoga nandhan < yoganandhan@gmail.com > wrote: Anyone, Can u plz give your opinion,   PQR qualification of SS pipe, 30" x 15.88 mm thik pipe by SMAW+SAW process, In RT defect observed in 200 mm length which is not acceptable as per Sec IX. But rest of the portions are without any significant defects.   Can we proceed with the Mechanical testing after discarding the defect area or is it required to Repair & Re-RT to be done in the defect area before taking the specimen for mechancial testing.....  Plz clarify.   BR P.Yoganandhan -- To ...

Hi all FOR PIPING WORKS: What means R4 and R5 for the radiography? If the thickness is below 8 mm, which is chosen? R5 or R4 Best regards Redouane (project engineer) Algeria -- 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 Limesh & All;   Thanx for your replies & advices.   The materials is A 106 Gr B, pipe Dia is 4” Sch 40, & we are using split tee 15 mm thick.   The same I had in my previous works, the issue were to qualified the welders for Temper Bead Procedure (Half bead). As per QW-290.   The surprise here for the client & client TPI, that, client TPI is asking to make a heating up to 300C for 30 to 60 min after completing the welding (which I search everywhere, I didn’t find such procedure in any relevant standards.) The second surprising thing is my client, is asking to make preheating to 350C for 3 hours before starting the work plus hydrogen baking.   My point is, the life line is wet LPG, H2S present 2500 PPM, which is very high, plus if I keep heating the line up to this temperature, I need to ensure it will not imply any unwarranted impacts , thus jeopardizing the operational LPG unit itself.     Regards Majdi Elyyan   F...

You can go for wet chemical method like weight loss method for better results. 2010/11/30 Noushad cp < ncp.clt@gmail.com > Dear All, How to measure  Electroless Nickel  Plating (Coating) ?i would like to know the Instrument which is use for ENP Measurement. Thanks and Regards, Noushad -- 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. -- regards, Harish. -- 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...

Dear All, Which P. no shall be assigned to weld Nuts of SA-194 grade 2H? Please provide your valuable comments.   Regards Shadab

Dear All, Can you tell me what is the importance of '' MO"(molybdenum) content in SS316L materials. -- Thanks, S.D.Mishra Mob- 09589444897 (M.P./C.G.) 09766916581 (Maharastra) -- 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.

In Duplex stainless steel cold pass technique is required. Regards Bharat B. Gole   Date: Tue, 30 Nov 2010 00:11:33 -0800 From: rameshnbarot@yahoo.com Subject: Fw: [MW:8436] HOT PASS To: materials-welding@googlegroups.com Dear All,   Pl.tell me each and every Process like SMAW, GTAW in SS,CS and LAS required hotpass?   In less thickness also?   What max.time we can allow for Hot Pass?   Waiting for reply...   Thanks, With Best Regards, Ramesh Barot ----- Forwarded Message ---- From: Shashank Vagal <nach_sam@yahoo.com> To: materials-welding@googlegroups.com Sent: Tue, November 30, 2010 11:46:07 AM Subject: Re: [MW:8430] HOT PASS Hi Vasu, The main function of a hot pass is to provide feed to the shrinking root pass weld metal lest it shrink-cracks. The root pass has to penetrate and fill the root gap and initiate the joint. Once it gets a proper metal feed by way of a hot pass, it will do its job well. That is why HP is conducted ...

Sir, Pl note the trailing mail & advise for suitable consumable regards Nagbhushan. India Sent from my BlackBerry® smartphone from !DEA From: vinit vani <vinit_vani@yahoo.co.in> Sender: materials-welding@googlegroups.com Date: Tue, 30 Nov 2010 14:28:06 +0530 (IST) To: <materials-welding@googlegroups.com> ReplyTo: materials-welding@googlegroups.com Subject: [MW:8437] Regarding high managanese steel Gr III WELDING Dear all   I have two different issues.   1)we want to do hardfacing on  high manganese steel Gr III Base Metal.     Please share your experience on MAG  Welding process for this material.     Also please intimate any additional & valuable information regarding this.   2)Other issue is to know the  applicable ASTM  Std for High Strength Low Alloy Cast     Steel               for the chemi...

Dear all   I have two different issues.   1)we want to do hardfacing on  high manganese steel Gr III Base Metal.     Please share your experience on MAG  Welding process for this material.     Also please intimate any additional & valuable information regarding this.   2)Other issue is to know the  applicable ASTM  Std for High Strength Low Alloy Cast     Steel               for the chemical composition given below as well as supplier for this material in INDIA if any.   Mn - 1.4 to 1.8 % Nb - 0.02 to 0.05 % V - 0 - 0.06 % Mo - 0.2 to 0.35 %  c-0.10 to0.15%   Please reply me promptly because the matter is urgent.   Thanks & Regards Vinit -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-weldi...

Dear All,   Pl.tell me each and every Process like SMAW, GTAW in SS,CS and LAS required hotpass?   In less thickness also?   What max.time we can allow for Hot Pass?   Waiting for reply...   Thanks, With Best Regards, Ramesh Barot ----- Forwarded Message ---- From: Shashank Vagal <nach_sam@yahoo.com> To: materials-welding@googlegroups.com Sent: Tue, November 30, 2010 11:46:07 AM Subject: Re: [MW:8430] HOT PASS Hi Vasu, The main function of a hot pass is to provide feed to the shrinking root pass weld metal lest it shrink-cracks. The root pass has to penetrate and fill the root gap and initiate the joint. Once it gets a proper metal feed by way of a hot pass, it will do its job well. That is why HP is conducted immediately after the root cleaning operation is over and the root pass is still hot, hence maintaining the same welding set up as used for root pass (and welders) is highly recommended. It can be seen then why: The hot pass gener...

Hi, You can go for coating thickness gauge. www.oxford-instruments.com (http://www.oxford-instruments.com/products/coating-thickness/coating-gauges/Pages/coating-gauges.aspx) Thanks & Regards, (Karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282 --- On Tue, 11/30/10, Noushad cp <ncp.clt@gmail.com> wrote: From: Noushad cp <ncp.clt@gmail.com> Subject: ENP Measurement To: "materials-welding" <materials-welding@googlegroups.com> Cc: "Karthik" <karthik6684@yahoo.com> Date: Tuesday, November 30, 2010, 2:42 PM Dear All, How to measure  Electroless Nickel  Plating (Coating) ?i would like to know the Instrument which is use for ENP Measurement. Thanks and Regards, Noushad -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this grou...

Dear All, How to measure  Electroless Nickel  Plating (Coating) ?i would like to know the Instrument which is use for ENP Measurement. Thanks and Regards, Noushad -- 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.

Refer ASME B 31.8 Chapter V table for location class Regards Bharat B. Gole     Date: Tue, 30 Nov 2010 09:52:12 +0400 Subject: [MW:8431] Radiography of pipeline Welds From: limesh78@gmail.com To: materials-welding@googlegroups.com Dear All,   Design Code: ASME B 31.8   Welding Code: API 1104   Terrain:Onshore   As per ASME B31.8, 2010 Edition, clause 826.3, 826.3 Inspection and Tests for Quality Control of Welds on Piping Systems Intended to Operate at Hoop Stress Levels of 20% or More of the Specified Minimum Yield Strength (a) The quality of each weld shall be examined by visual inspection. (b) In addition, a certain percentage of the welds shall be examined through radiographic examination, ultrasonic testing, magnetic particle testing, or other comparable and acceptable methods of nondestructive testing .The trepanning method of nondestructive testing is prohibited. The following minimum number of field butt welds shall be selected o...

Refer para 840.22, these are to be defined by designer based on the human occupancy (similar to fluid category in B31.3)   From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of limesh M Sent: Tuesday, November 30, 2010 11:22 AM To: Materials & Welding Subject: [MW:8431] Radiography of pipeline Welds   Dear All,   Design Code: ASME B 31.8   Welding Code: API 1104   Terrain:Onshore   As per ASME B31.8, 2010 Edition, clause 826.3, 826.3 Inspection and Tests for Quality Control of Welds on Piping Systems Intended to Operate at Hoop Stress Levels of 20% or More of the Specified Minimum Yield Strength (a) The quality of each weld shall be examined by visual inspection. (b) In addition, a certain percentage of the welds shall be examined through radiographic examination, ultrasonic testing, magnetic particle testing, or other comparable a...

Hi Vasu, The main function of a hot pass is to provide feed to the shrinking root pass weld metal lest it shrink-cracks. The root pass has to penetrate and fill the root gap and initiate the joint. Once it gets a proper metal feed by way of a hot pass, it will do its job well. That is why HP is conducted immediately after the root cleaning operation is over and the root pass is still hot, hence maintaining the same welding set up as used for root pass (and welders) is highly recommended. It can be seen then why: The hot pass generally uses a higher than normal amperage setting (approx. 10% higher than root amps setting)  and a fast travel speed. The latter to reach all shrinking areas in time. No welding will stop before RP+HP are complete as a minimum. Shashank Vagal --- On Sun, 28/11/10, M.Shankar <mails_shankar@yahoo.co.in> wrote: From: M.Shankar <mails_shankar@yahoo.co.in> Subject: Re: [MW:8419] HOT PASS To: materials-welding@googlegroups.com Date: Sunday, 28 Novem...

Dear All,   Design Code: ASME B 31.8   Welding Code: API 1104   Terrain:Onshore   As per ASME B31.8, 2010 Edition, clause 826.3, 826.3 Inspection and Tests for Quality Control of Welds on Piping Systems Intended to Operate at Hoop Stress Levels of 20% or More of the Specified Minimum Yield Strength (a) The quality of each weld shall be examined by visual inspection. (b) In addition, a certain percentage of the welds shall be examined through radiographic examination, ultrasonic testing, magnetic particle testing, or other comparable and acceptable methods of nondestructive testing .The trepanning method of nondestructive testing is prohibited. The following minimum number of field butt welds shall be selected on a random basis by the operating company from each day's construction for examination. Each weld so selected shall be examined over its entire circumference or else the equivalent length of welds shall be examined if the operating company chooses to examine...

Hello Azmi   Long time no see.   If you can satisfy UG-84, it doesnt necessarily means that you need to complete everything within three months, you just need to start welding within the three months period. That's how we do it in Alberta, Canada anyway.     Regards Ricardo       On Sun, Nov 28, 2010 at 9:22 PM, JASPAL SINGH < jaspaldhesi@gmail.com > wrote: Dear Asad Azmi, My Point wise Reply for your Query is as follows - The Thickness of your vessels is within the requirements of UG-84(6mm or 25% of the thickness) - Practically I think the welding of these three vessels will not be possible within three month span for all 'A' & 'B' Catagory Joints, if your production schedule is possible you can go for lesser number of PTC. - Eraction at Single site has no advantage the fabrication should be done at same location for three vessels. - As the heat number is not same but material specification is same you can choose the material from any o...

Hi,   We can  measure and making bench mark for Root penetration on the basis of Radiographs in the field of Pipe Line Welding by using LP /EP penny.   Regards M.Nagoor Meeran KKNPP-Project Kudankulam-627106 Tamilnadu.     From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of muthu kumaran Sent: Saturday, November 27, 2010 10:24 AM To: materials-welding@googlegroups.com Subject: [MW:8396] Excess Weld Root Penetration-Reg.   Hi,   How to measure and making bench mark for Root penetration on the basis of Radiographs in the field of Pipe Line Welding. -- Cordially , P.Muthukumaran Welding Inspector -- 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/ ...

If thickness is coming out more than code requirement, you may have to do PWHT. For on line service welding, PWHT is not practically possible at site. You may have to choose compatible material, FEA analysis, ECA analysis.. Thanks, H Solanki On Mon, 29 Nov 2010 09:03:56 +0530 "Majdi N Elyyan" wrote > Dear All; We have a hot tap on LPG line (Sour service) which require PWHT. The run Pipe is 4", the branch is also 4", split tee will be used. As per shell DEP-31.38.60.10 – for Hot tapping, clearly mention: Hot-tap welding should not normally be performed on materials which require post-weld heat treatment. However, if stress relieving or post-weld heat treatment is required, a specialist shall be consulted to assess whether it is feasible to make the specific hot-tapping operation with post-weld heat treatment. Note: Stress-relieving may be required if a material is susceptible to stress corrosion cracking and post-weld heat treatment may be specified by...