Materials & Welding

Dear Sridhar,                    thanks for swift reply,now its clear to me. -- Thanks & Regards Shashi On Fri, May 31, 2013 at 12:46 PM, c sridhar < sridhar305@yahoo.com > wrote: After  breaking the seal and considerable gap of time, re-baking is to be done for LH type electrodes, as the electrodes would have picked up moisture by then  when exposed to the humid conditions.    All low Hydrogen type electrodes may have > 10 ml  & < 15 ml of H2 per 100 grams of weld (except for H4 type LH  electrodes, where it is less than 3 to 4 ml. of H2 ) and re drying  to be done  to reduce the H2 level   to < 10 ml.by holding them at 300 deg. C for 2 hrs. in the oven.  Drying should be done only once and prolonged drying  (or) more drying cycles will whither the flux coating and may produce cracks  on the coating surface and make the electrodes unusable.   The electrodes are then held in Holding oven (if required) at 100-150 deg.C,...

Dear bijoy I think you are kidding, It's  not a secret. You may hear about STEREO-RADIOGRAPHY! Regards On Fri, May 31, 2013 at 1:19 PM, Nandesh Kumar < nandeshkumar@rocketmail.com > wrote: Parallax is a method to 'estimate' the depth of the discontinuity in the weld; not for the measurement of volumetric flaws. ವಂದನೆಗಳೊಂದಿಗೆ / Best regards, Nandesh Kumar Arasappa P.S . : Please don't print this e-mail unless you really need to. --- On Thu, 30/5/13, Jean Staton < Jean.Staton@metco-ndt.com > wrote: From: Jean Staton < Jean.Staton@metco-ndt.com > Subject: RE: [MW:17841] Radiographic Film Interpretation Excess Penetration.. To: " materials-welding@googlegroups.com " < materials-welding@googlegroups.com > Date: Thursday, 30 May, 2013, 5:54 PM It my be possible to perform a Paralax method.   From: materials-welding@googlegroups.com [mailto: materials-welding@googlegroups.com ] ...

Hi! I would like to share my experience with 410S overlay on CS i) If you try to overlay 410S/410  chemistry on Cs,  It does not pass in bend during bend test as per ASME sec IX (It cracks) if client is very stringent and he requires only 410S chemistry in such case you require to take waiver  for Bend test which is job specific    You can try with 410 consumable with low C% less than 0.04 (Which is very difficult to get( Some time even 309MoL/309L barrier  with subsequent layer by 410 chemistry being used)   ii) Some time you may use 410 Ni Mo to get satisfactory bend test results However weld chemistry will have Ni ,Mo but major element will of Cr which will be in the range of 410   iii) However my experience is a) ",client accepts the 309L/309MoL for 410 clad restoration and b)  for high temp service (Like coke drum)client accepts the NiCrFe3 or NiCrMo3 chemistry where there is no problem of crack during bend test ...

Dear Manoj, Pls refer AWS D1.1 Cls 5.3.3.3, it is clearly mentioned that you can use the mixture of used flux and virgin flux but it does not affect the composition of the flux materials. Thanks & Regards, Bala On 5/29/13, manoj john < manojacgnr@gmail.com > wrote: > Dear Memebers, > > We are using SAW process for Carbon Steel welding but i have doubt in reuse > of flux . My doubt is that on what basis we can reuse the electrode i am > not able to find any standard or guide line for reusing. We are reusing > the fluxes mixed with 20% used and 80% new flux, is it OK and please give > me some information for reusing of flux or mixing of used flux with new > flux. > > Thanks in advance. > > Manoj > > -- > 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 ...

After  breaking the seal and considerable gap of time, re-baking is to be done for LH type electrodes, as the electrodes would have picked up moisture by then  when exposed to the humid conditions.    All low Hydrogen type electrodes may have > 10 ml  & < 15 ml of H2 per 100 grams of weld (except for H4 type LH  electrodes, where it is less than 3 to 4 ml. of H2 ) and re drying  to be done  to reduce the H2 level   to < 10 ml.by holding them at 300 deg. C for 2 hrs. in the oven.  Drying should be done only once and prolonged drying  (or) more drying cycles will whither the flux coating and may produce cracks  on the coating surface and make the electrodes unusable.   The electrodes are then held in Holding oven (if required) at 100-150 deg.C,  if backed in large quantity and to avoid repeated re-baking (re-cycling) and damage to the coating if  unused for any prolonged ...