[MW:14412] RE: 14411] WPS on Forged Steel

Dear Sir,

 

I don’t know what your welding specification is but when you speak about S355J2G3 material it seems to me that it will be according to EN-ISO 15614-1 because it’s an European material. For this specification both forged and rolled materials are group 1.2 materials and no difference is made between forged or rolled condition as long as both materials are in the normalized condition. Furthermore Table 3 of this EN-ISO 15614-1 also mentions with note “a”  that a qualification made with a specific material in group 1 also qualifies for materials in the same group with similar or lower specified minimum yield strength.

I know from my experience that forged materials in general have lower yield strength than rolled materials (mostly caused by thicker wall thicknesses) so therefore the TPI is asking things outside the specification and in my opinion they have no right to ask for exactly the same material. Only problem could be when your project specification asks for similar Carbon Equivalent and PCm value for your welding procedure qualification, but this depends on the actual chemical composition of your forged part so you have to check the materials certificate for that.

Hope this will help you a little.

 

Best Regards,

 

J.H.H. Pieper

QA-QC Inspector / IWI-C / IWT / Materials expert

 

Job van der Havestraat 6

8384 DB, Wilhelminaoord

Tel: 06-51691215

 

Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens Lab
Verzonden: woensdag 30 mei 2012 7:00
Aan: materials-welding@googlegroups.com
Onderwerp: [MW:14411] WPS on Forged Steel

 

Dear Friends,

 

In our production unit, we would like to make butt weld between forged steel grade of S355J2G3, a round shaped object. The Third part Inspection (TPI) agency which clears the joint, insists us to perform WPS on similar material before production welding. This particular material was imported from other country long back and we could not thick about WPS when we purchased. It is not possible for us to get the similar material (same grade & same condition) suitable for WPS as well as WPQ and no response from the suppliers when contacted for supply of small quantity.

 

At last one supplier came forward and ready to supply S355J2G3 of rolled and normalized plate.

 

When we went to TPI with the proposal of making WPS with rolled plate, they are not convinced as the properties of forged and rolled steel even after Normalizing, are different and insisting us to do WPS test on forged steel of same grade.

 

Request the forum to provide guidelines to get rid of this situation or from where I get small quantity of material of similar grade, condition in India to arrange for WPS.

 

Regards,

Megnath

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