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[MW:20870] RE: 20869] Duplex Casting CD4MCuN PQR qualification

By Materials & Welding
Hello Brajendra,
 
E-2209 is not the correct electrode for repairing ASTM A 890 Gr CD4MCuN casting. One has to use exactly matching or over matching welding consumable for welding of this alloy. See the Metrode  attached data sheet for your reference. The other option is to use the  matching  Zeron 100 electrode.
 
The attached data sheet from Flowserve gives a full overview of this alloy. CD4MCuN  is the improved version of CD4MCu. Weldability could be an issue for this alloy, as it's a casting  and  the mechanical properties could be unfavorable without solution anneal.
 
Duplex S.S melting and refining is clean process, as this involves AOD or  VOD during manufacturing. I would suggest to incorporate proper surface cleanliness prior to performing any welding.  Casting would  involve the traces of chemicals involved in manufacturing of the mould . Removal of these  substances prior to welding might be of help.
 
Thanks.
 
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Specialist
Ontario, Canada
pgoswami@quickclic.net
pradip.goswami@gmail.com
pradip_goswami@yahoo.ca
 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Brajendra Singh
Sent: Friday, May 23, 2014 12:38 PM
To: materials-welding@googlegroups.com
Cc: Brajendra.Patel@ksb.com
Subject: [MW:20869] Duplex Casting CD4MCuN PQR qualification

Dear Experts,

                        I am trying to qualify a procedure for welding of duplex casting ASTM A 890 Gr CD4MCuN material  with Electrode E2209-16 but i am facing problem of blow holes on weld during. Kindly share the possible cause & solution for the same.

Regards,
Brajendra Patel
Cont:9325085748

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