Re: [MW:28722] Auto Welding Copper back up strip fused with Root run

Hi,

Please confirm whether you incorporated below requirements,

Check para 328.3.2 WBM, (b) says If two abutting surfaces are to be welded to a third member used as a backing ring and one or two of the three members are ferritic and the other member or members are austenitic, the satisfactory use of such materials shall be demonstrated by welding procedure qualified as required by para. 328.2.

or

(c) Nonferrous and Nonmetallic Backing Rings. Backing rings of nonferrous or nonmetallic material may be used, provided the designer approves their use and the welding procedure using them is qualifiedas required by para. 328.2.

I had a same similar observation in my previous projects where like 500 welds were completed with SS backing strip which is a longitudinal welds of full encirclement, so not to get puncture with the base materials they have used SS plate backing strip removable without procedure qualifications, still i found some fusion / depostion in the backing and they said it is temporary, BM is CS BS is SS, so i made a violation, but you know it went in different level.

Anyhow even if you are working for SA projects, even tempeory backing strips shall be of same materials, please confirm whether you on SA projects? and did you demonstrate procedure qualification or your designer approved?

Thanks.

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Regards,

Mohamed Muneeb Mahaboob

CSWIP 3.2-89247/2 

ASNT-NDT-L2-RTFI-RT-UT-MT-PT.

SAP#:70021650 APs:JAPID, QCS & QCI.

E muneebslsa@gmail.com M +91-636-955-7189

(6:8) They say, "Why has no ˹visible˺ angel come with him?" Had We sent down an angel, the matter would have certainly been settled ˹at once˺, and they would have never been given more time ˹to repent˺.

 

From: Ri@z

Date: 2018-12-04 11:14

To: Materials & Welding

Subject: [MW:28719] Auto Welding Copper back up strip fused with Root run

Dear All, 

We are introduced auto welding on 6.62 MM thickness , API 5L X 70 .  J groove prepared with 2 mm root face and zero root opening. 

Root has supported with copper back up strip/Shoes

But after welding we observed that copper back up strip is melted and fused with root run. 

Kindly help to resolve the issue. What are the possible reason for the problem ?? 

With Regards

Riaz Rafeeque 

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