Materials & Welding

If the company is an ASME certified for Code stamps, you can not have sub contract with another company for welders. You have to have contract with individual welders. arun  On Wed, Mar 31, 2010 at 6:26 PM, Chaitanya Purohit < chaitanya_purohit@yahoo.co.in > wrote: You can make a contract with company or even with individual welder and in the contract you have to mention that you are responsible to provide training and appropriate qualification to those welder and having "authority to remove them if performance found unacceptable".  All Welder qualification records shall be in your company letter head (WPQ format). You have to maintain the performance record of each welder and record of continuity in case you are using for more than 6 months. Regards. CK On 31 March 2010 11:37, Muhammed Ibrahim < ibratech@gmail.com > wrote: Hi gents,   I have a query regarding the sub contact of welders. Eg : I am working in company 'X'. I want to sub contract...

Supporting PQR's qualify the production joint thickness, however check the Base metal group number on PQR, since SA333 Gr6 is Gr1 and SA516 Gr70 falls under Gr2. WPS should state base metal thickness range as 6-12 and 16-200mm, when impact testing required. and 1.5 to 200mm w/o toughness requirement. On Wed, Mar 31, 2010 at 7:56 PM, Muhammed Ibrahim < ibratech@gmail.com > wrote:   Hi Members,   Please provide a solution for the following issue.   Shell Material : SA 516 Gr.70 -- 50 mm Thk Nozzle : SA 333 Gr.6 --- 7 mm thk   MDMT : - 46 Deg.C   I need to weld the nozzle to shell. I have a PQR with SMAW process qualified in 40 mm thk and another PQR with SMAW qualified in 6 mm thk.   As per Sec. IX if impact test is required the 40 mm PQR will support from 16 mm to 200 mm. base metal Thk. and the other PQR will support from 6 mm to 12 mm thk.   If I club these PQR can I write a WPS to support 6 mm to 200 mm?. Is there any issue for the missing range of qualifi...

Dear Sir,   puneet takiar Dear Sir, You have to check the threading depth too. means it might happen that to overcome looseness of nuts , mfgr has decrease the core dia so as to increase the thread height. Or you can check its tensile properties by direct breaking.   Regards, Puneet From: Chandra Bhusan Tripathi <cbt@rediffmail.com> To: Mohamed.Soliman@WorleyParsons.com Cc: materials-welding@googlegroups.com Sent: Mon, 29 March, 2010 7:40:52 PM Subject: Re: [MW:4632] Bolts failure You can send damaged bolt for tensile testings. Sometime the bolts also fails due to over tightening. Please check with the manufacturer for correct tightening torque. On Tue, 30 Mar 2010 11:38:16 +0530 wrote > Dear all , Ihavea casefor the bolts and nutGrade 8.8 ,Carbon steel material according to EN 20 898.Those bolts and nuts are failedduring the tightening and some of the nuts are loose . What tests can becarried out to ensure the soundness of those bolts . Best ...

You can make a contract with company or even with individual welder and in the contract you have to mention that you are responsible to provide training and appropriate qualification to those welder and having "authority to remove them if performance found unacceptable".  All Welder qualification records shall be in your company letter head (WPQ format). You have to maintain the performance record of each welder and record of continuity in case you are using for more than 6 months. Regards. CK On 31 March 2010 11:37, Muhammed Ibrahim < ibratech@gmail.com > wrote: Hi gents,   I have a query regarding the sub contact of welders. Eg : I am working in company 'X'. I want to sub contract some welders from company 'Y'. If I qualify that welders as per my company welding pocedure (Company A procedures), is it equired to make a contract with that welders individually?. Or can I make a contract with that supply company?. UW 26 (d) says 'manufacturer m...

  Hi Members,   Please provide a solution for the following issue.   Shell Material : SA 516 Gr.70 -- 50 mm Thk Nozzle : SA 333 Gr.6 --- 7 mm thk   MDMT : - 46 Deg.C   I need to weld the nozzle to shell. I have a PQR with SMAW process qualified in 40 mm thk and another PQR with SMAW qualified in 6 mm thk.   As per Sec. IX if impact test is required the 40 mm PQR will support from 16 mm to 200 mm. base metal Thk. and the other PQR will support from 6 mm to 12 mm thk.   If I club these PQR can I write a WPS to support 6 mm to 200 mm?. Is there any issue for the missing range of qualification between 12 mm to 16 mm?. Or is it required to add another PQR to fill the missing thickness range from 12 to 16 mm between the first two PQRs?. Or can I write a WPS directly with range 5mm to 200mm omiting impact test requirement for this joint as it is a category D joint and excempted from Production Test Coupon?. Thanks & Regards Muhammed Ibrahim PK -- To post to this gro...

Are you looking for long term solution or temporary solution to complete the project ? I have used both the methods and found acceptable. If your requirement is temporary and you have facility of in-house testing you can choose Carbon arc gouging. For carbon are gouging you have to grind 3mm after carbon arc gouging To be assured how much carbon deposition / dilution from the carbon rod occurred, you can do mock up at different depth (after removal of surface layers) and carry out PMI to check carbon % and other main elements and establish the data. The same can be witnessed by client. In my experience there is not much carbon pick up observed and you can get the chemistry at 0.5 to 1.0 mm depth (no need to remove 3mm from the gouged surface). In plasma hand held torch you need very skill full operators and getting that torch may affect the Project Cost. You have not mentioned what type of joints and shape & size of the product.   Regards. On 31 March 2010 09:46, PB HEGDE < h...

individual contract is required. arun AIS On Wed, Mar 31, 2010 at 11:37 AM, Muhammed Ibrahim < ibratech@gmail.com > wrote: Hi gents,   I have a query regarding the sub contact of welders. Eg : I am working in company 'X'. I want to sub contract some welders from company 'Y'. If I qualify that welders as per my company welding pocedure (Company A procedures), is it equired to make a contract with that welders individually?. Or can I make a contract with that supply company?. UW 26 (d) says 'manufacturer may engage idividuals by contract as welder'.   Please povide a reply. Thanks & Regards Muhammed Ibrahim PK -- 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...

Dear Sandesh,                        Please specify clearly what is your requirement?? Regards, Yadav Shiva Chelliya, Inspection Engineer, Doha Qatar, +974-6166465 On Wed, Mar 31, 2010 at 10:37 AM, Sandesh Pandey < sandesh.pandey10@gmail.com > wrote: Dear All Would you suggest Test requirements for NACE for CS or SS materials.   With warm regards Sandesh Pandey -- 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@goo...

Hi,   You can use GTAW Twin welders for welding from both side simultaniously to avoid back gouging. Minor back grinding touch up is only required if you use twin weldes. If back gouging un avodable, use plasma arc gouging.   Regards, Ibrahim On 31 March 2010 09:46, PB HEGDE < hegde.pb@isgec.com > wrote: Dear  Friends   What is the best method of back gouging of SS weld of heavy thickness plate? Do you prefer i)                     Back Gouging by Carbon Arc rod ii)                    By Plsama gouging with hand torch   Ia)If By Carbon Arc rod – How much gouged surface you prefer to grind ? to remove carbon contamination Iia) Is there any special plasma torch available for back gouging   Regards   Hegde P.b. -- 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...

Hi gents,   I have a query regarding the sub contact of welders. Eg : I am working in company 'X'. I want to sub contract some welders from company 'Y'. If I qualify that welders as per my company welding pocedure (Company A procedures), is it equired to make a contract with that welders individually?. Or can I make a contract with that supply company?. UW 26 (d) says 'manufacturer may engage idividuals by contract as welder'.   Please povide a reply. Thanks & Regards Muhammed Ibrahim PK -- 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 All Would you suggest Test requirements for NACE for CS or SS materials.   With warm regards Sandesh Pandey -- 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 Friend.   You should use Plasma Gouging with Hand Torch and use the Flapper disc for cleaning.              Regards   Syed Arshad Farooq     QA / QC Engineer   PROCTER & GAMBLE  D.L UNIT KARACHI ( +92-21-111-284-284,5378637-40 ) : +92-308-3067599 From: PB HEGDE <hegde.pb@isgec.com> To: materials-welding@googlegroups.com Sent: Wed, March 31, 2010 10:46:01 AM Subject: [MW:4640] Back gouging of SS Dear  Friends   What is the best method of back gouging of SS weld of heavy thickness plate? Do you prefer i)                     Back Gouging by Carbon Arc rod ii)                    By Plsama gouging with hand torch   Ia)If By Carbon Arc rod – How much gouged surf...

Dear  Friends   What is the best method of back gouging of SS weld of heavy thickness plate? Do you prefer i)                     Back Gouging by Carbon Arc rod ii)                    By Plsama gouging with hand torch   Ia)If By Carbon Arc rod – How much gouged surface you prefer to grind ? to remove carbon contamination Iia) Is there any special plasma torch available for back gouging   Regards   Hegde P.b.

No as long as sufficient details are given in the TC for establishing that it conforms to the specification. Regards, Abu Rehan Abbasi +965-97274238 -----Original Message----- From: materials-welding@googlegroups.com [mailto: materials-welding@googlegroups.com ] On Behalf Of qaqcmpm Sent: Wednesday, March 31, 2010 6:50 AM To: Materials & Welding Subject: [MW:4637] SA965/SA788 while reviewing the MTC for SA965, it states 3.2 Material supplied to this specification shall conform to the requirements of Specification A 788 If the MTC does not have mentioned SA788, is it a non conformance? -- 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...

My opinion, yes: refer 16.1.3.1 of SA788 Reference to Specification A 788/A 788M including the year date together with the applicable revision letter, if any, of the revision used shall be a part of the certification. -----Original Message----- From: materials-welding@googlegroups.com [mailto: materials-welding@googlegroups.com ] On Behalf Of qaqcmpm Sent: Wednesday, March 31, 2010 9:20 AM To: Materials & Welding Subject: [MW:4637] SA965/SA788 while reviewing the MTC for SA965, it states 3.2 Material supplied to this specification shall conform to the requirements of Specification A 788 If the MTC does not have mentioned SA788, is it a non conformance? Filtered by Hosted Filtering -- 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 m...

while reviewing the MTC for SA965, it states 3.2 Material supplied to this specification shall conform to the requirements of Specification A 788 If the MTC does not have mentioned SA788, is it a non conformance? -- 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 unsubscribe, reply using "remove me" as the subject.

Mr. Soliman,   The easiest test to determine the correct strength properties (and grade) of the bolts is to perform hardness testing on the cross section of the failed bolts.  The average hardness on the cross section can be converted to an approximate value of ultimate tensile strength (UTS).  If your budget allows, you may also perform a chemical analysis and microstructural analysis, which will tell you if your material is correct and in the proper microstructural condition.  Additionaly, you can have the fracture surfaces of the bolts examined with an SEM that can search for failure mechanisms like hydrogen embrittlement but this is getting more expensive.   Regards,   Jeremy Zibin, PEng From: Chandra Bhusan Tripathi <cbt@rediffmail.com> To: Mohamed.Soliman@WorleyParsons.com Cc: materials-welding@googlegroups.com Sent: Tue, March 30, 2010 1:40:52 AM Subject: Re: [MW:4632] Bolts failure You can send damaged bolt for tensile test...

Dear Rutvik, What Hemant told is absolutely right. Since, when austenite is <50 wt.%, materials show net duplex microstructures. But when the austenite percentage is higher than ferrite, a diffusion interface appears at grain boundaries, which modifies all the properties. The objective of this work is to characterize this interface in order to identify its nature and predict the behaviour of the duplex stainless steel. For this purpose, a duplex stainless steel has been produced by mixing ferritic–austenitic stainless steel grade powders, compacting at 700 MPa and sintering in vacuum at 1250 °C for 30 min. The mentioned interface has been studied by SEM and light optical microscopy (LOM) and characterized by nanoindentation in order to determine the hardness and Young's modulus of each phase. Testing mechanical properties completes the study. Yadav Shiva Chelliya, Inspection Engineer, Doha Qatar, +974-6166465 On Tue, Mar 30, 2010 at 12:33 PM, hpi001 < pieper-qsi@kpnmail.n...

Dear Rutvik, You will always have differences in the distribution of austenite when welding is involved. The dendritic austenite structure for the weld is normal and mostly will have a little bit more austenite than ferrite. In the heat affected zone always the opposite is present. During welding and cooling down there will arise more ferrite in the heat affected zone even when you take the necesary precautions regarding interpass temp of max. 150 - 175°C. Important is that the base material have a homogenous distribution of Austenite Islands in a Ferritic matrix. The requirements for the Ferrite range of 35 - 65 % is what you should keep in mind. In the weld it will be near to 35% and in the HAZ near to the fusion line it will be near to the 65%. The only way to prove that the present microstructure met the requirements for the corrosion properties is to perform a corrosion test on this WPS. Best Regards, Herman Pieper On 30 mrt, 00:17, "pgoswami" < pgosw...@quickclic...

Metric Bolt Torque Table Estimated with clamp load as 75% of proof load as specified in ISO 898-1 Property Class 8.8                 10.9                  12.9 Socket Head  Cap Screw  Minimum Tensile  Strength MPa M6 - M16:  800 M20 - M30:  830 1040 1220 Nominal Size and Thread Pitch Bolt Torque Specs in Foot Pounds or (Inch Pounds) Dry Lubed Dry Lubed Dry Lubed M5 x 0.80 (54) (41) (78) (59) (91) (68) M6 x 1.00 (92) (69) (133) (99) (156) (116) M7 x 1.00 (156) (116) (222) (167) (260) (195) M8 x 1.25 (225) (169) (333) (242) (377) (284) M10 x 1.50 37 28 53 40 62 47 M12 x 1.75 65 49 93 69 108 81 M14 x 2.00 104 78 148 111 173 130 M16 x 2.00 161 121 230 172 269 202 M18 x 2.50 222 167 318 238 372 279 M20 x 2.50 314 235 449 337 525 394 M22 x 2.50 428 321 613 460 716 537 M24 x 3.00 543 407 776 582 908 681 M27 x 3.00 796 597 1139 854 1331 998 M30 x 3.50 1079 809 154...

You can send damaged bolt for tensile testings. Sometime the bolts also fails due to over tightening. Please check with the manufacturer for correct tightening torque. On Tue, 30 Mar 2010 11:38:16 +0530 wrote > Dear all , Ihavea casefor the bolts and nutGrade 8.8 ,Carbon steel material according to EN 20 898.Those bolts and nuts are failedduring the tightening and some of the nuts are loose . What tests can becarried out to ensure the soundness of those bolts . Best Regards M.S Hotmail: Free, trusted and rich email service. Get it now. -- 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. applicabl...

you have to use the torque chart given in EN according to the bolt size you are using. Karthikeyan.S   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, 3/30/10, Soliman, Mohamed (kuwait) <Mohamed.Soliman@WorleyParsons.com> wrote: From: Soliman, Mohamed (kuwait) <Mohamed.Soliman@WorleyParsons.com> Subject: [MW:4630] Bolts failure To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com> Date: Tuesday, March 30, 2010, 1:07 PM    Dear all ,   I have  a case  for the bolts and nut Grade 8.8 ,Carbon steel material according to EN 20 898.Those bolts and nuts are failed during the tightening and some of the nuts are loose .   What tests can be carried out to ensure the soundness of those bolts .   Best Regards M.S     Hotmail: Free...

   Dear all ,   I have  a case  for the bolts and nut Grade 8.8 ,Carbon steel material according to EN 20 898.Those bolts and nuts are failed during the tightening and some of the nuts are loose .   What tests can be carried out to ensure the soundness of those bolts .   Best Regards M.S     Hotmail: Free, trusted and rich email service. Get it now. -- 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 unsubscribe from this group, send email to materials-welding+unsubscribegooglegroups.co...

Dear Syah, For the A53 GrB this specification for pipe, steel, black and hot dipped, zinc coated, welded and seamless. It itended for mechanical and pressure application. And for the A106 GrB this specification for seamless carbon steel pipe for high temperature service, it suitable for bending, flanging, and similar forming operation and for welding. Brg Hong Ky Thai -- 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 unsubscribe from this group, send email to materials-welding+unsubscribegooglegroups.com or reply to this email with the words "REMOVE ME" as t...

Dear syah; the Spec A-106  is only for seamless pipe and can be used according ASME B31.1 (POWER PIPING). Regards A.V   Date: Mon, 29 Mar 2010 14:19:57 +0300 Subject: Re: [MW:4621] Material Grd B53 And SA106-B From: luvshiv2002@gmail.com To: materials-welding@googlegroups.com dear syah,                     The specification for A53  for Pipe, Steel, Black and Hot dipped, zinc coated, and seamless &  for A 106 Specification for seamless Carbon steel pipe for HIGH Temperature service....   On Mon, Mar 29, 2010 at 1:46 PM, Syahrian Zulfan < syahrian09@gmail.com > wrote: Dear all,   can anyone advice me whether material Grd B53 and SA106-B is same? If yes what is differenting both of its   Rgds, Syah -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-...