Materials & Welding

Try using DCSP root, it should help you. Also, as Ramu has mentioned, please check the extent of magnetizm present   regards, > Date: Thu, 31 Jul 2008 17:47:02 +0530 > From: orm24@yahoo.co.in > Subject: [MW:986] Re: Root under cut > To: materials-welding@googlegroups.com > > > Dear Atul, > If you are concerned more about to avoid root undercut, the only thing you need to do is to demagnetise the job near to wep and on wep with the help of demagnetising equipment and weld after demagnetising. You will get a smooth weld without any undercut. > For one of our projects, we have over come the undercut problem by demagnetising and welding. This is for your information and for ferritic materials only. > > Regards > Ramu > +971-50-8249649-personal # > +971-50-8181761-official # > > > --- On Mon, 28/7/08, atul patil <atulpatil99@gmail.com> wrote: > > > From: atul patil <atulpatil99@gmail.com> > > Subject...

Have you tried Ar CO2 mixed gases? What is the gas being used and what is the flow rate   regards, jd Subject: [MW:1050] RE: 1047] thumb rule Date: Fri, 22 Aug 2008 10:59:59 +0530 From: R.Bathula@ticb.com To: materials-welding@googlegroups.com If ur using Globular you can switch to spray transfer method to reduce spatter,   V =20+0.4 i    is a thumb rule for SMAW, no idea about GMA.   -----Original Message----- From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of mech Sent: Thursday, August 21, 2008 7:49 PM To: Materials & Welding Subject: [MW:1047] thumb rule     hai friends  is there any thumb rule to find current and voltage in metal active gas welding ... v r using semi automatic MAG machine.with   2.4 mm filler wire dia .current in the rang of 570-670 amps and  voltage 30-39  .and tell wat would b the best way to reduce spattesrs and blow holes ...

It is depend on the type on non-metal that you are using for seating material?   Plaese tell what is seating material?   On 8/29/08, Bathula Raghuram (Mumbai - PIPING) < R.Bathula@ticb.com > wrote: In general you may refer Table A323.4.3 of ASME B31.3   From: piping_valves@yahoogroups.com [mailto: piping_valves@yahoogroups.com ] On Behalf Of swapnil gorantiwar Sent: Friday, August 29, 2008 1:51 PM To: piping_valves@yahoogroups.com Subject: [piping_valves] piping_valves   i want to know the temperature range of non-metallic seat material for ball valves. for which temperature range which non-metallic seat material is to be used in ball valves?   Regards, Swapnil Gorantiwar   __._,_.___ --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups....

Interpretation if radiographic images for discontinuities in the welds   Transverse crack Logitudinal Crack Internal concavity Burn through Logitudinal root crack Tungsten Inclusions Elongated Slag Lines Lack of Side wall fusion Offset or Mismatch Offset or Mismatch with LOP Interpass slag inclusions Incomplete penetration or LOP Interpass Cold Lap Scattered porosity External porosity External concavity Excessive penetration Cluster porosity Root pass aligned porosity External undercut Internal undercut      

In general you may refer Table A323.4.3 of ASME B31.3   From: piping_valves@yahoogroups.com [mailto:piping_valves@yahoogroups.com] On Behalf Of swapnil gorantiwar Sent: Friday, August 29, 2008 1:51 PM To: piping_valves@yahoogroups.com Subject: [piping_valves] piping_valves   i want to know the temperature range of non-metallic seat material for ball valves. for which temperature range which non-metallic seat material is to be used in ball valves?   Regards, Swapnil Gorantiwar   __._,_.___ --~--~---------~--~----~------------~-------~--~----~ 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 pe...

As in the past we found few questions on furnaces and felt to add this to those messages. Just today I read an interesting second page article in newspaper on Finex furnace which are new generation furnaces without ovens able to operate using fine coal instead of the traditional coking coal which is a high pollutant. Using this furnace the energy cost and pollution is reduced. And yet it does produce the pig iron suitable for high grade steels. Posco with Siemens, then VAI has developed this in the past 10 years spending heavily and Posco's new plant in India and Vietnam are planned to be build with these Finex furnaces. This is a modification of Corex furnaces as per the article. They claim the cost is reduced by 10% in overall and as the current fine coal price and coking coal price gap is increasing, they hope it should be more profitable in the coming years. Good for Nature and Environment and in having a competitive steel price. Regards, Kannan. --~--~---------~--...

Acicular ferrite, is a new term to me, is it some thing related to improving toughness? (Though' I didn't remember but I read it somewhere on a article related to underwater welding) I am end user of consumables (and most of us) doesn't bother about the chemistry of coatings in to that depth I am curious to know what made you to change coating for 60XX series rather than going for 70XX series to get better mechanical properties? From the textbook reading I can say Tio2 is an arc stabilser, where as Mno&Al2O3 are added for slag forming. Wish you Good luck, and hope you will share your findings with us soon Probably you could find some info for your research in the book Welding metallurgy by George E. Linnert -----Original Message----- From: materials-welding@googlegroups.com [mailto: materials-welding@googlegroups.com ] On Behalf Of verry Sent: Thursday, August 28, 2008 11:32 PM To: Materials & Welding Subject: [MW:1073] The influence of flux TiO2, MnO and Al2O3 for ...

Dear Members I have a problem with my reseach, i want to know the influence of those flux ability to change the properties of weld metal. Know i was found an advantage that flux TiO2 can increase the mechanical properties of weld metal. from the AWS Standard they say that E6013 will have 430-460 MPa of minimum strength, but i had 508 MPa with E6013 by adding flux TiO2 in electrode face. My analysis now just from the mechanical test, i was find an acicular ferrite structure in this research. But i don't know how the accicular ferrite function for the mechanical properties of weld metal and the theory of the influence of flux TiO2, MnO and Al2O3 accurately. I need yours help for all members that want to partcipate. thanks so much... note : this research done in Mechanical Engineering Departmet, University of Andalas, West Sumatra, Indonesia. --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to materials-welding@googlegroups.com To unsubscribe...

Dear Friends, My answer was with respect to the question asked ie what are the differences between API 650 and API 620 Tanks. I had highlighted only the major differences, Higher pressure what I meant with respect to code limitation between API 650 and API 620 and Double wall what I mentioned is with respect to low temperature servcies appendix Q which is not dealt by API 650. If you are using API 650 OR API 620 ,You must read the code scope and limitations and API 650 Limitation is the design conditions ie max internal pressure not exceeding the wt of roof plates and tempt 90 degree centigrade or 2.5 psi (18kpa) max internal pressure as per APPENDIX F and Max tempt 260 degree centigrade in line with Appendix M requirement. whereas API 620 Max Limit is internal pressure of 15psi and 250 degree F.Also refer appendix R & Q . Limitation on lower pressure for API 620 Pl refer API 650 Appendix M Fig F 1 Design Decision Tree. Best Regards, Francis Lobo ----- Original Message ----- From: ...

as far as i know it is true to some extent induction heating is used for bending in the preffabrication shops, but i am not aware of any for PWHT of welds at site by induction heating. In particular how it will effect in higher thickness (>30mm) over conventional method, what is the advantage? On 28 Aug, 21:32, Kannan.Sunda...@Linde-LE.com wrote: > I understand that in projects like Borouge, Ruwais the main construction > contractor CCC is using and are prefering the induction heating.  As per > my conversation the same as you have highlighted of the prefabrication > spooling had been found to be more efficient and less time consuming and > very acurate control of temperature, in comparision. > > With regard to portability as per the contractor, they are using both > portable and as well as fabrication shop stationed machine. It is > available on lease by quite a no. of suppliers in the gulf region in > particular. I havn't checked out the names...

I understand that in projects like Borouge, Ruwais the main construction contractor CCC is using and are prefering the induction heating.  As per my conversation the same as you have highlighted of the prefabrication spooling had been found to be more efficient and less time consuming and very acurate control of temperature, in comparision. With regard to portability as per the contractor, they are using both portable and as well as fabrication shop stationed machine. It is available on lease by quite a no. of suppliers in the gulf region in particular. I havn't checked out the names of manufacturer nor the leasing agents, but can find out. CCC also does have its own facility in the region in catering to various project sites of them. So in that sense it could be more efficient and cheaper solution on the run though the initial investment is high. With regards, Kannan Raghuram Bathula <raghurambathula@gmail.com> Sent by: materials-welding@googlegroups.com 28/...

Dear members Please share your experience on the subject method for pipe welds (PWHT to be carried at site), one of our client insisting for Induction heating instead of PWHT by conventional resistance coil heating. tho' i have seen literature on this I need info on availability (first hand experience) of the equipment, portability etc.. I understand it is faster but advantageous in mass production, and may not be easier for site activities. i don't see any reason for this method over resistance heating --~--~---------~--~----~------------~-------~--~----~ 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/stand...

what code your are using and what is your material? On 28 Aug, 19:41, mgk < mgkuma...@gmail.com > wrote: > can any one tell what are the essential variables which we have to > consider when we are welding plate thickness of 8 and 12 mm by flash > butt welding --~--~---------~--~----~------------~-------~--~----~ 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. -~----------~----~----~----~------~----~------~--~---

can any one tell what are the essential variables which we have to consider when we are welding plate thickness of 8 and 12 mm by flash butt welding --~--~---------~--~----~------------~-------~--~----~ 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. -~----------~----~----~----~------~----~------~--~---

For the benefit of Chennai friends, or who or available at Chennai during last week of September2008. From: hasan [mailto: hasan@igcar.gov.in ] Sent: Wednesday, August 27, 2008 5:17 PM To: Bathula Raghuram (Mumbai - PIPING) Subject: MARWEL 2008   Dear Sir,   The Indian Indian Institute of Welding (IIW), Chennai Branch, is organising a two day COURSE ON METALLURGICAL ASPECTS RELATED TO WELDING (MARWEL-08) during 25 and 26 September, 2008 , at Hotel Radha Park Inn, 171, Jawaharlal Nehru Salai, Chennai - 600106 . This course is specifically designed for practicing welding engineers, technocrats and managers; designers; inspection and quality control engineers; fabrication engineers, research scholars, and academicians involved in teaching welding; but did not have any formal training in metallurgy. I am enclosing a brochure for your perusal.   Welding plays a key role in every manufacturing process in a wide range of industries Any welding...

Dear Friends, One of our jobs need welding of Borated SS plates (UNS 30464). Would anybody like to share his experience? --~--~---------~--~----~------------~-------~--~----~ 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, I dont think the statement is correct for API 620. It is the code for Large, welded, low pressure storage tanks and can be of single wall or double wall construction. Regards, R. Bose On Aug 25, 12:55 pm, francis.l...@indiatimes.com wrote: > Dear Freinds, > API 650 is a code for tankages for storage of liquid petroleum Products at atmospheric pressure or very low posetive pressure ( ref Annexure M) whereas API620 is a code for storage tanks for higher pressures and it is having primary shell and secondary shell and primary shell is for the storage of product like ethylene/propylene/ammonia etc with the gap between two shell is filled with insulating material to take care of cryogenic  temperature and more stringent requirements are covered in API 620. > > Regarding HAZ , it is not measured by length ,we speak about width of HAZ and noramlly it is not more than 3to 5mm whcih normally you can see when you do a macrosection of weld coupon and this can be reduced ...

Dear Mr. Aarpee Can you pl give ref to the para where does this requirement (for high Pressure Natural Gas applications.........) come from? -----Original Message----- From: materials-welding@googlegroups.com [mailto: materials-welding@googlegroups.com ] On Behalf Of francis.lobo@indiatimes.com Sent: Monday, August 25, 2008 5:50 PM To: materials-welding@googlegroups.com Cc: ramprasad.chari@gmail.com Subject: [MW:1060] Re: Impact testing at -29 deg c and warmer Dear Friends, SHELL material stanadard DEP 30.10.02.11.GEN, Thum Rule may be applied for deriving the impact properties if you have tested at -46 degree centigrade to derive at -20 or warmer temperatures, ( 1.5 JOULES PER DEGREE CENTIGRADE , Eg : 18 joules at -51 degree centigrade may be regarded as 27 joules at -45degree centigrade Noramlly if it is tested at -46 degree centigrade there is no meaning asking for -20 degree or warmer ,Normally for NGL servcie etc -20degree or warmer impact is asked to take care of upset conditio...

Thank you very much Parviz ,   According to your direction I found it. Can I have your email address and the permission of contacting you? My email address is: ali@propipemanufacturing.com   Sincerely yours’ Ali   -----Original Message----- From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of parviz farhadi Sent: Saturday, August 23, 2008 6:28 AM To: materials-welding@googlegroups.com Subject: [SPAM] [MW:1054] Re: AISI Grade 4130 Alloy   I think for this pressure and temperature still u can use the ASME B31.3 just use the section K which is high pressure.   Regards,   On 8/22/08, ali < ali@propipemanufacturing.com > wrote: Dear Friends, I would appreciate if you be able to give your advice to me about the designing of a very high pressure line heater. I am in process to design a line heater with the following information:   ...

Dear Chetan and other friends, Gas fired furnace is cost effective compare to Electrical one. Gas fired furnace can be made of bigger sizes to accomodate bigger size of components. Electrical furnace is suitable for smaller size only where test coupans or test pieces are to be heat treated. Even In gas fired, Natural Gas is better than LPG but offcourse depends upon availability and necessary infrastructure. I am not aware about UAE condition as far as availability of NG and LPG. hope I answered your query. Regards, Rajesh B. Patel Abu Dhabi --- On Mon, 8/25/08, Chetan Parekh < cpp1506@gmail.com > wrote: > From: Chetan Parekh < cpp1506@gmail.com > > Subject: [MW:1056] PWHT Furnace > To: materials-welding@googlegroups.com > Date: Monday, August 25, 2008, 2:00 AM > Hi Friends, > > I need comparision between gas fired furncae and electrical > induction > heating furnace. Basically I am looking for advantage and > disadvantage > between these tw...

Dear Friends, SHELL material stanadard DEP 30.10.02.11.GEN, Thum Rule may be applied for deriving the impact properties if you have tested at -46 degree centigrade to derive at -20 or warmer temperatures, ( 1.5 JOULES PER DEGREE CENTIGRADE , Eg : 18 joules at -51 degree centigrade may be regarded as 27 joules at -45degree centigrade Noramlly if it is tested at -46 degree centigrade there is no meaning asking for -20 degree or warmer ,Normally for NGL servcie etc -20degree or warmer impact is asked to take care of upset conditions such as sudden stop or shut downs etc to ensure the impact properties where material is not impact tested or not required by code. For A333GR6 /A350 LF2 code calls for impact testing at -46 degree or cooler temeperatures and in Europe all materials need to be tested for +20 degree centigrade if ASME/API code does not specify. Best Regards, Francis Lobo ----- Original Message ----- From: Aarpee < ramprasad.chari@gmail.com > To: Materials & Welding ...

Dear Freinds, API 650 is a code for tankages for storage of liquid petroleum Products at atmospheric pressure or very low posetive pressure ( ref Annexure M) whereas API620 is a code for storage tanks for higher pressures and it is having primary shell and secondary shell and primary shell is for the storage of product like ethylene/propylene/ammonia etc with the gap between two shell is filled with insulating material to take care of cryogenic temperature and more stringent requirements are covered in API 620. Regarding HAZ , it is not measured by length ,we speak about width of HAZ and noramlly it is not more than 3to 5mm whcih normally you can see when you do a macrosection of weld coupon and this can be reduced by using preheat /temperbead welding or by having chemistry with low CE Best Regards, Francis lobo ----- Original Message ----- From: prabhakars84@gmail.com To: Materials & Welding < materials-welding@googlegroups.com > Sent: Sat, 23 Aug 2008 16:16:48 +0530 (IST)...

Dear members, As per PV code ASME SEC VIII Div 1,impact test is not mandatory for PV materials for P 1 and Gr1 &2 materials upto thk of 1" for majority of materials.However for high Pressure Natural Gas applications say 100 Bar design pressure,it is asked to do impact testing at -20 deg C for materials like A333GR6/A350LF2CL1 materials.Inspite of having satisfactory values at testing temperature of -45/-46 deg C,testing at -20 deg C is insisted.Can anyone explain logic behind this? Further,it may please be noted that as per: UCS 66(c)-no impact testing is required for B16.5 flanges of ferritic steel when used at MDMT not colder than -29deg C and; UCS 66(d)-pipe size 4" and below(P NO 1),impact test exemption is there as a function of Yield Stress for temp -104 Deg C and warmer e.g. 20 ksi to 30 ksi-6.0mm thk.Which implies that for 6.0 mm thk pipe of 4"NB and below,no impact test is mandatory for tempr upto -104 deg C. However for Natural Gas applications,for material...

Fuel-Fired Furnaces   Advantages : · Lower energy cost · Easy to adjust or alter connected input · Faster heat-up times because inexpensive control factors can be added to accommodate the difference in fuel burned during heat-up Disadvantages : · Requires extensive ventilation systems · Potential explosion or fire hazard · Requires more manpower for start-up and shutdown · Adjustment more difficult to maintain, resulting in excessive fuel use · Only certain materials or types of products can be run in direct-fired furnaces due to the effect of high dew point and oxidizing flue gases on the part surface   Electrically Heated Furnaces   Advantages : · Systems are clean and free of the pollution normally found with fuel-fired systems · Quieter because of the absence of blowers and combustion noise · More uniform heat pattern · No exhaust system required...