Yes
Final Conclusion in my opinion and based on the interpretation by Mr Jayakumar
Quote"
AS P Number and F number are essential variables for welder qualification and not A number. QW 423 provides exception for P-Number allowing both the ranges and F Number is same for SS & DSS.
AS per ASME Sec.iX it is permissible to use SS welder on DSS. Only thing in Dss welding Oxygen content in the purging gas has to be monitored and the welder educated on the same.
End Quote"
If a welder is qualified using coupon of P1 through P11 (Any material in between) he/she is qualified for welding P1 through P11 (Any material in between);
So he/she is already qualified for essential variable P No
Next is F number,
The F number of the electrodes used for both material is same.
So YES it is acceptable to use the same welder. As far as ASME BPV Section IX is concerned.
Regards,
Umar
From: 'ms viswanathan' via Materials & Welding [mailto:materials-welding@googlegroups.com]
Sent: Wednesday, December 06, 2017 8:44 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:27131] Qualifications of welders
Hai all,
What is your final conclusions.
Regards, M.S.Viswanathan
On Tuesday, December 5, 2017 9:45 PM, John Henning <jhenning@deltak.com> wrote:
Some care here needs to be applied and please remember to note that this applies only to welder performance qualification.
QW-423.1 refers to unassigned base metals. In the case of unassigned base metals, generally the welder is only qualified for welding the unassigned base metal.
However,
QW-423.2 allows for base materials produced to other standards that meet the chemical and physical requirements of a P-Number material, to be used as if it were the P-number material for performance qualification. This is an exception to the general rule stated in QW-423.1 for "unassigned" base metal.
Enjoy
John
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Hasin Shaikh
Sent: Monday, December 04, 2017 11:11 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:27115] Qualifications of welders
Dear Jhon Sir
As per QW 423.1 -unassigned material with similar chemical composition also included,
in that case no need to go further new performance qualification if unassigned material have similar chemical composition with previous any qualification ,
This is my interpretation, is correct or not please advise.
With Regards
Hasin Shaikh
On Mon, Dec 4, 2017 at 9:22 PM, John Henning <jhenning@deltak.com> wrote:
No welder requalification is not required, provided all other requirements of QW-353 are met, and only Section IX qualification is required..
While Table QW-353 states QW-403.18 is an essential variable one has to look further. QW-403.18 states:
So one has to look again further at QW-423, Alternate Base Materials for Welder Qualification: There is no distinction made between P8 and P10H as far base material required is concerned. In fact the welder could have qualified using P1 base materials for both P8 and P10H base metals.
However, customer requirements may restrict qualification.
Clearly, applying the first instance in QW-423.1, performance qualification with P8 material
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of PGoswami
Sent: Monday, December 04, 2017 9:28 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:27111] Qualifications of welders
A new qualification is required in this case. Qualification on other austenitic stainless steels(P No 8) does not permit the validity of qualification for duplex stainless steels (P No 10H). It's clearly stated under QW-353, please see the extract below.
F No for both ASS and DSS are the same, F5 for SMAW (SFA 5.5) and F6 for GTAW/GMAW(SFA 5.9).
Thanks.
P.Goswami.P.Eng, IWE.
Welding & Metallurgical Specialist
QW-351 GENERAL
A welder shall be requalified whenever a change is
made in one or more of the essential variables listed for
each welding process
From: 'ms viswanathan' via Materials & Welding [mailto:materials-welding@googlegroups.com]
Sent: December 4, 2017 7:23 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:27109] Qualifications of welders
Yes, I agree .Thanks for your guidance.
Regards, M.S.Viswanathan
On Monday, December 4, 2017 1:46 PM, Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:
MSV
pl see QW 416,423.
A no is at all essential variable for welding performance qualification. Let us not misguide the people.
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CONSULTANT-WELDING & QUALITY
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On Mon, Dec 4, 2017 at 3:51 PM, 'ms viswanathan' via Materials & Welding <materials-welding@googlegroups.com> wrote:
No, because DSS - P number is 10H and A.No-7 and .S.S- P number is -8 and A.No 8 , essential variables.
Regards, M.S.Viswanathan
On Monday, December 4, 2017 12:42 PM, foued oudina <oudinafou21@gmail.com> wrote:
Dear Colleagues ;
Could you please help me, we have welders qualified in SS they can weld DSS.
Thanks
OUDINA FOUAD | QC Welding OFF PLOT
Técnicas Reunidas Group
TouatGaz Project – EPCC Processing & Production Facilities
Field Engineering Group
Oued Zine, Adrar, Algeria
( Ext. 3912
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