Materials & Welding

Dear all , Can some one Tell me that why are we take pneumatic test of RF pad of pressure vessels nozzle??? -- 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/CAHjJ0V_5nq7hurgbta5XPCe3jx2cs1d3DP6GvUiAmLXD200jVQ%40mail.gmail.com . For more options, visit https://groups.google.com/d/optout .

Dear Experts,   A QUERY CONCERNING TRIMMING/MODIFYING OF ELBOWS Can we use 90 degree elbow as 30 degree elbow by cutting it in aramco project, If  any one Knows Aramco standard reference ?   Thanks. -- 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/CAFoQ_ndOcE%2BjnthWumsVQmSbaDxLQ7Eux_n73aOp0-ZEdx_DMw%40mail.gmail.com . For more options, visit https://groups.google.com/d/optout .

GOSWAMI, Thanks for your general infos. I am interested in more infos about the influence of CaF2 on the arc stability( metal transfer)in the case when welded at electrode(e.g.E 7018)negative polarity. In this case the cheracteristic diameter of the droplets increase and CaF2 MIGHT is the cause of this behaviour.We have to take into account ,fluoride ions have high mobility(they have small size) and tend to migrate toward to anode.Fluoride ions react with the layer of positive charges existing there and reduce the cathode spot size.The viscozity of molten metal also play the role in the metal transfer(deoxidizers existing in the electrode coating or electrochemical reactions that occur at the electrode prior to transfer). Will be nice for us if you have more infos. GIGI ZEGHEANU EWE TOTAL E&P -------------------------------------------- On Sun, 29/3/15, pgoswami < pgoswami@quickclic.net > wrote: Subject: RE: [MW:23012] HOLDING OF ELECTRODES...

Dear Sirs, Presently we are doing hot dip galvanization of pipe spools where we have to protect the serration of flanges during galvanization. Can any body suggest what can be applied on serration to protect it from adhesion of ZINC on serration. Please Advise. Regards Arvind -- 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/CABsdp%3Dhxthn0ujzS3ckEkLa%2Bne7a-EGZQS8twYujryySuz4CSw%40mail.gmail.com . For more options, visit https://groups.google.com/d/optout .

hi..thanks. read these docs...no clue on reasons on where we went wrong?   On Monday, 30 March 2015 14:27:08 UTC+5:30, Lalu r p wrote: Hi, With all high strength, quenched and tempered fine grained structural steels, DILLIMAX steels are susceptible to cracking (Cold cracking) in the weld area if the conditions are unfavorable AND these cracks may not appear until 48 hours after welding. In order to ensure that the tensile strength of the weld metal fulfills the requirements of the base metal, the heat input and interpass temperature must be limited during welding. Please refer the attached data sheets for more information. regards, LALU LINKS MIDDLE EAST ABU DHABI, UAE On Mon, Mar 30, 2015 at 11:00 AM, RK < krishn...@gmail.com > wrote: Hi..   We have used Dillimax 690PE material for our penstocks under construction. Experienced delayed cracking in welds (after a month or so) in all most all the welds...in all 3 welding processes used SAW, SMAW, FCAW...cracks ...

The stresses appeared quite late.  Usually cold cracks appear after 2 days. Are you sure for the correcteness of the stress analysis on which the joint design is based   From: LALU RAJENDRAN [lalucpt@gmail.com]   Sent: 03/30/2015 12:51 PM ZE4   To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>   Subject: Re: [MW:23018] Dillmax 690 weld cracks Hi, With all high strength, quenched and tempered fine grained structural steels, DILLIMAX steels are susceptible to cracking (Cold cracking) in the weld area if the conditions are unfavorable AND these cracks may not appear until 48 hours after welding. In order to ensure that the tensile strength of the weld metal fulfills the requirements of the base metal, the heat input and interpass temperature must be limited during welding. Please refer the attached data sheets for more information. regards, LALU LINKS MIDDLE EAST ABU DHABI, UAE On Mon, Mar 30, 2015 at 11:00 AM, RK...

Gas cutting & grinding... thickness 40 to 48 mm photo i'm sending to your mail id.. thanks..   On Monday, 30 March 2015 14:13:56 UTC+5:30, vanchi wrote: what method was used for joint preparation? gas cutting, grinding , machining ? what is the thk of joint.? can you take a photo of cracked joint and send. my mail id : vanchinaths @ gmail.com On Mon, Mar 30, 2015 at 12:30 PM, RK < krishn...@gmail.com > wrote: Hi..   We have used Dillimax 690PE material for our penstocks under construction. Experienced delayed cracking in welds (after a month or so) in all most all the welds...in all 3 welding processes used SAW, SMAW, FCAW...cracks are only in the welds!!! Process is PH 100-150 DegC, Interpass 200 Deg C and DHT 200-250 DegC for 3 hrs. Can anyone have any idea what could be the reasons?? we are in soup...and not able to proceed further..   rgds   -- You received this message because you are subscribed to the Google Groups "Materials & Welding...

Hi, With all high strength, quenched and tempered fine grained structural steels, DILLIMAX steels are susceptible to cracking (Cold cracking) in the weld area if the conditions are unfavorable AND these cracks may not appear until 48 hours after welding. In order to ensure that the tensile strength of the weld metal fulfills the requirements of the base metal, the heat input and interpass temperature must be limited during welding. Please refer the attached data sheets for more information. regards, LALU LINKS MIDDLE EAST ABU DHABI, UAE On Mon, Mar 30, 2015 at 11:00 AM, RK < krishna.4969@gmail.com > wrote: Hi..   We have used Dillimax 690PE material for our penstocks under construction. Experienced delayed cracking in welds (after a month or so) in all most all the welds...in all 3 welding processes used SAW, SMAW, FCAW...cracks are only in the welds!!! Process is PH 100-150 DegC, Interpass 200 Deg C and DHT 200-250 DegC for 3 hrs. Can anyone have any idea what could b...

what method was used for joint preparation? gas cutting, grinding , machining ? what is the thk of joint.? can you take a photo of cracked joint and send. my mail id : vanchinaths @ gmail.com On Mon, Mar 30, 2015 at 12:30 PM, RK < krishna.4969@gmail.com > wrote: Hi..   We have used Dillimax 690PE material for our penstocks under construction. Experienced delayed cracking in welds (after a month or so) in all most all the welds...in all 3 welding processes used SAW, SMAW, FCAW...cracks are only in the welds!!! Process is PH 100-150 DegC, Interpass 200 Deg C and DHT 200-250 DegC for 3 hrs. Can anyone have any idea what could be the reasons?? we are in soup...and not able to proceed further..   rgds   -- 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 gro...

Dear Sir,   I have a 2 chemical compositions one is Italian material another one is Brazilan material, Requesting you to conform the grade or any equivalent material in Indian grade. Italy chemical composition ELEMENTS           % BY WT C                                0.243 Si                                0.26 Mn                              1.19 P                                 0.012 S                                 0.008 Cr                                0.32 Ni       ...

Hi..   We have used Dillimax 690PE material for our penstocks under construction. Experienced delayed cracking in welds (after a month or so) in all most all the welds...in all 3 welding processes used SAW, SMAW, FCAW...cracks are only in the welds!!! Process is PH 100-150 DegC, Interpass 200 Deg C and DHT 200-250 DegC for 3 hrs. Can anyone have any idea what could be the reasons?? we are in soup...and not able to proceed further..   rgds   -- 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/71e1545b-e44d-4786-9afe-6e6d53a90...

GIGI ZEGHEANU ,   I am not sure what's your real concern on the coating and arc stability issue with respect to basic coated electrodes. This topic had been more or less like "proven and frozen truth" and many of the formulations, chemical ingredients  and their weight percentages in the coating, is more of " manufacturer's closely guarded secret".   Please see below the extract from a TWI article( it's a 5 part series). As this is a free download , its  assumed as no-proprietary.Many of such articles are downloadable in the web.   The arc stability , fluidity of the weld puddle all depend on the combined effects of the various ingredients . Consumable manufacturers  has to test electrodes with various formulations to meet  AWS or other international standards. See the attached article from Kobelco,which gives a systematic breakdown of various coating constituents and their effects. Generally Low Hydrogen ...

need to qualify a PQR of CS to SS in AWS D1.6. Can you gentlemen please guide me with your expertise and knowledge. Also a SAMPLE pWPS FORMAT would help a lot. Thanks in advance   :) -- 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/dcf4fc57-bf88-4890-9508-ac7592d64860%40googlegroups.com . For more options, visit https://groups.google.com/d/optout .

The following etching reagents and directions for their use are suggested for revealing the macro structure. Aluminum and Aluminum-Base Alloys         Hydrochloric acid (concentrated) 15 ml         Hydrofluoric acid (48%) 10 ml         Water 85 ml This solution is to be used at room temperature, and etching is accomplished by either swabbing or immersing the specimen. U cane also refer to following: Etchant Conc. Conditions Comments Kellers Etch Distilled water Nitric acid Hydrochloric acid Hydrofluoric acid 190 ml 5 ml 3 ml 2 ml 10-30 second immersion Use fresh For most aluminum and aluminum alloys Methanol Hydrochloric acid Nitric acid Hydrofluoric acid 25 ml 25 ml 25 ml 1 d...