[MW:13821] RE: 13800] using E308H-17 instead of E308H-16

Hi Peyman,

 

As listed in QW 253, a change of AWS classification (QW 404.12) is a supplementary essential variable, which means a change from E-308 to E-316 . If the changes  related to filler metal are are such that, only  type of coating is change e.g, from 15 to 16 or 17, a requalification as per Sec-IX is not required.

 

As per ASME Sec-IX,  QW--404.12(c):- if the changed  filler metal conforms to a filler metal classification within an SFA specification, requalification is not required if a change is made in any of the following-

• for carbon, low alloy, and stainless steel filler metals having the same minimum tensile strength and the same nominal chemical composition, a change from one low hydrogen coating type to another low hydrogen coating type (i.e., a change among EXX-15, 16, or 18 or EXXX-15, 16, or 17 classifications).

However  editorial changes should be made in the WPS.

 

Note  many clients' specification calls for requalification if the coating type is changed, one may have to  keep that in mind.

 

Thanks.

 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist & Consultant

Ontario, Canada.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Peyman Hafezi
Sent: Thursday, March 01, 2012 6:18 AM
To: materials-welding@googlegroups.com
Subject: [MW:13799] using E308H-17 instead of E308H-16

 

Dear friends
We have a  WPS for welding 321-SS  base metal with ER 308h+E 308h-16 which is approved by PQR but the matter is non-availability of E308H-16 and we would like to use E308H-17 instead.
There is no mechanical and chemical difference between these two according to ASME Sec II Part C, the only difference is in cover composition that makes -17 better for fillet welds in comparison with -16. But the question remains because our joint is groove and not fillet. What's your opinion? Could -17 be used for groove welding instead of -16 ( without need of a new WPS and PQR) ?

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