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Re: [MW:21917] SS Filler wire selection

By Materials & Welding
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You are opening a subject here!!!

  • Code Section VIII-1 in UG-18 is addressing welding of dissimilar metals without giving a definition of "dissimilar". UG-18 is making reference to Section IX. Section IX is addressing dissimilar metals in the chapter relevant to brazing. In the QW part only dissimilar thickness is addressed. However if you look on the example of UG-18, the Code considers as dissimilar the welding between Carbon Steel and Stainless Steel.
  • Something similar you will find in the notes of PW-39-5 of Section I
  • Section VIII-2 is addressing dissimilar materials without give a definition of "dissimilar" (see 3.2.4)

In the field of corrosion engineering dissimilar are the materials with different potential. In this field we have a very clear definition

In the field of metallurgy, to my sense, we have a dissimilar joint when elements (C, Cr, etc) migration can occur and transitional phases are present
    best regards

    Dr. Georgios Dilintas

    Authorized Nuclear Inspector
    Authorized Inspector Supervisor


    I&F REGIONAL TECHNICAL MANAGER
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Vadivel Mahadevan ---16/09/2014 15:05:44---Hello Mr.George,

From: Vadivel Mahadevan <vadivelmahadev@gmail.com>
To: materials-welding@googlegroups.com
Date: 16/09/2014 15:05
Subject: Re: [MW:21915] SS Filler wire selection
Sent by: materials-welding@googlegroups.com



Hello Mr.George,
 
Thanks for your view and clarification.
 
A final question in this regard.. Do we call this combination( CF3 with F316L) as a Dissimilar joint?
 
Regards
Vadivel. M
 

On Tuesday, September 16, 2014 5:07:30 PM UTC+5:30, George Dilintas wrote:

    I do not see any reason for 309. There is no risk for low FN and hot cracking.
    You may use 309, it will harm your pocket only if you have a lot of welds.
    You can go with 316L with no problem
    If you should weld 316L to carbon steel, then 309 would be mandatory to avoid low FN and hot cracking
      best regards

      Dr. Georgios Dilintas

      Authorized Nuclear Inspector
      Authorized Inspector Supervisor


      I&F REGIONAL TECHNICAL MANAGER
      BUREAU VERITAS HELLAS

      Tel: +30 210 40 63 113/4
      Fax: +30 210 40 63 118
      Cell: +30 69 44 64 62 04
      (See attached file: Dilintas_George.vcf)


    Vadivel Mahadevan ---16/09/2014 07:44:37---Hello Dr. Georgios,

    From:     Vadivel Mahadevan <vadivel...@gmail.com>
    To:     material...@googlegroups.com
    Date:     16/09/2014 07:44
    Subject:     Re: [MW:21905] SS Filler wire selection
    Sent by:     material...@googlegroups.com



    Hello Dr. Georgios,

    Can I use the same ER316L for joining, CF3 with F316L combination.
    Do we call this as a Dissimilar joint?
    I presume it is not, as it falls in the same P No., but some seniors in my organisation says it is a dissimilar metal, hence ER309LMo. to be used instead of ER316L.


    Regards
    Vadivel. M

    On Wednesday, September 10, 2014 12:09:36 PM UTC+5:30, George Dilintas wrote:

      I would say YES
        best regards

        Dr. Georgios Dilintas

        Authorized Nuclear Inspector
        Authorized Inspector Supervisor


        I&F REGIONAL TECHNICAL MANAGER
        BUREAU VERITAS HELLAS

        Tel: +30 210 40 63 113/4
        Fax: +30 210 40 63 118
        Cell: +30 69 44 64 62 04
        (See attached file: Dilintas_George.vcf)

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