Dear Arun,
From the Recommended Practice API 577: "Welding Processes, Inspection, and Metallurgy", it is achieved:
Annex D, Table D.2 reads: —Common Welding Consumables for SMAW of Carbon and Low-allow Steel.
It should say: —Common Welding Consumables for SMAW of Stainless Steel.
This table contains the Base Metal combination for stainless steels.
If we observe, it has three calls: 1, 2, 3.
Call 2, says: "The higher alloy electrode specified in the table is normally preferred".
This confirms that if you have two different Base metals (304L and 316L, for example) within the same SS family, the electrode that is chosen is the one that contains more alloying elements compatible with the higher alloyed base metal. In this case, the welding electrode for the combination 304L / 316L should be E-316L. (AWS A5.4 Classification E316L-XX).
It is understood that the weldability in this combination is maintained, regardless of whether you use E-308L or E-316L.
The service, the current of the fluid that is handled, would be the determining factor to use one or the other.
Regards,
Ramon Briceno
Metallurgical Engineer.
Sent from Mail for Windows 10
From: Arun Padman
Sent: Saturday, May 8, 2021 9:01 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:32359] filler material between 304L and 316L
You can refer to API RP 577 APPENDIX D,
But it's an RP, not a standard.
As per API RP 577 APPENDIX D you can use both 308L and 316L filler wire.
Regards,
Arun Padman Manayil
Plant Inspector
Tel:+974 50577156
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On Sat, May 8, 2021 at 3:41 PM Ramon Briceno <bricenori@hotmail.com> wrote:
Dear Chiranjeevi for this 304L / 316L weld, a qualified WPS should have been used where the filler material was superior metallurgy for the joint. In this case, use type 316L filler material to achieve adequate Mo content as protection against intergranular corrosion by chlorides, for example.
Sorry, I think you're going to have to cut those 20 welds made with 308L.
In all Codes and Standards, good welding practices indicate the correct combination.
Regards,
Ramon Briceno
Metallurgical Engineer.
Amon
Sent from Mail for Windows 10
From: Chiranjeevi A
Sent: Saturday, May 8, 2021 12:09 AM
To: materials-welding@googlegroups.com
Subject: [MW:32355] filler material between 304L and 316L
Dear Experts,
At the site 308L filler wire used for the Pipe joint between 304L and 316L. After doing the PMI QC rejected the joints and suggesting to use 316 filler.
Experts kindly share the details of the code reference to accept or any procedure to avoid cutting 20joints.
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