[MW:4239] Pure Iron barrier with ER 410S overlay

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Clad Engineering (10064)

By L. M. Smith, Presented at The Offshore Technology Conference, Houston, May 4-7, 1992. Corrosion resistant alloy clad steel has been available in various forms for more than 40 years. It is being used increasingly in the oil and gas industry. This publication describes methods of manufacturing and details of welding clad plate, pipe and fittings in the context of the specific requirements of this industrial sector. It also provides information on existing applications of clad products. The publication concludes that there are successful applications of clad steel worldwide using a wide variety of product forms and that there is considerable experience in welding clad steel. For new projects, there is a wide choice of product types to suit most sizes and components so that clad steel is an obvious engineering option for corrosive production systems.

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Hi Hrishi,

Use of pure iron electrode for barrier layer is a cost effective way to weld 410S clad carbon steel pipes. In general for a single sided weld  on clad pipes, the weld would have to be done with complete austenitic alloy e.g ER 309/309L or Inconel Type of filler or electrodes. During the very early part of my career with a very large fabricator in Vizag and  while working with EIL specs (if I remember correctly) I came across such requirements. If I could recollect this welding technique and restrictions are imposed  to safeguard against failure in Chloride SCC environment

The attached paper from NIDI  provides good information on clad steel.Page 8 refers the use of pure iron electrode for barrier layer deposition. Page 26 provides the schematic. Due to size restriction for the forum (4mb Max) I could not post the article . If you send me your personal email. I would  be able to send it  to you.

D&H 45S is  the relevant Pure Iron welding electrode ( slightly lower strength, but with  good elongation).While  qualifying PQR, where 410S alloy is involved, you may face problems with ductility( i.e , in bends)

If you could share some more information on the technical requirements, it would be appreciated.

Hope you would find information as useful.

Thanks.

Pradip Goswami, P.Eng
88,Garth Trails Crescent
Hamilton,Ontario, L9B2X1,Canada
Email-pgoswami@sympatico.ca
Email-pgoswami@quickclic.net
Tel-905-679-9677


  _____ 

From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of K.M Hrishikesan
Sent: Saturday, February 06, 2010 12:13 AM
To: materials-welding@googlegroups.com
Subject: [MW:4236] Pure Iron barrier with ER 410S overlay


Hi friends

Why Pure Iron barrier is used in some cases of overlaying ER 410S on a CS + A 410S cladded pipe joint?
Where can I get Pure Iron barrier?

Thanks
Hrishi

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