Re: [MW:23728] Cellulosic Electrode Usage Instead of Basic Electrode

Dear Sir;

I know i can't change 7018 to 7010 depending on same PQR thus i am also making preparation for a new PQR. So please take my question as application will be done on new PQR. Additonally i shall say their intention to use cellulosic electrodes on large pipes (i.e 96'').Your comments are appreciated.

Best Regards;

Demir

On Sat, Oct 17, 2015 at 1:21 PM, Perumal Govindan <perumalgovindan@gmail.com> wrote:

Hi

You can not replace the electrode, since SFA number, UTS & alloying element presence to meet the weld metal properties  and WPS (approved) for pipe welding.

Regards
PG

On 17 Oct 2015 11:51, "Demir Alp" <demiralp85@gmail.com> wrote:

• Dear Sirs;

  I would like to get Your professional advisory regarding selection of the filler material in Piping Welding of the P:1 G:1 Pipe Materials.

  For a large variety of Thickness and Diameters i have written 3 different WPS by combination of GTAW + SMAW process with usage of ER 70S-6 (Root and Hot Passes using GTAW) and E7018 (for Fill passes and Cap using  SMAW process.)

  However Our construction dept , insists on usage of Cellulosic electrodes instead of basic electrodes for higher deposition rate.

  As QA/QC I am doubtful replacing 7018 with 7010 or any other cellulosic electrode because of their tendency for hydrogen induced cracking. I'd like to add in my previous project We used to have X70 pipes and our employer didn't allow us to use cellulosic elecrodes just because hydrogen induced cracking.

  Thus I would like  to get your professional opinion regarding this subject,

   Best Regards; 

  Demir

• 
  

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