WPS with baking for welding single side welded Joint without backing with qualified Welder without backing

[Aly]

Dear experts,   Could you please clarify following;   If I have qualified WPS with backing & qualified Welder without backing; with this can we weld single side welded joint without backing.Please reply me in the light of ASME SEC IX.   Thanks in advance   Ali Mhaskar

[Prabhakar Seenivasan]

Yes you can. Because deletion of Backing is a Non Essential variable for WPS and since welder is qualified without backing he can weld with backing also. Make sure that the WPS is not affecting the essential variables of the qualified welder.

Regards

Prabhakar. S

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[vijayan]

Hi

A welder can basically qualified on a qualified WPS. In your case, the WPS is with backing but the welder is qualified without backing which is conflicting. Even though the  deletion of backing is not an essential variable for a WPS, either you have to rewrite the WPS with backing (if qualified for that) or have to qualify the welder on without backing WPS. In addition, the WPS number shall be reflected in the welder qualification certificate.

See the excerpt below from Sec IX which clearly states the performance qualification on qualified WPS

BR

M.Vijayan

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[george....@gr.bureauveritas.com]

The backing is not a parameter for WPS qualification in ASME IX

best regards

Dr. Georgios Dilintas

Authorized Nuclear Inspector
Authorized Inspector Supervisor

I&F Regional Technical Manager
Bureau Veritas Piraeus - Greece
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"Aly" <mhask...@gmail.com>

"Aly" <mhask...@gmail.com>  Sent by: material...@googlegroups.com 31/01/2012 19:07 Please respond to material...@googlegroups.com

To <material...@googlegroups.com> cc Subject

[MW:13596] WPS with baking for welding single side welded Joint without backing with qualified Welder without backing

Ref

Dear experts,   Could you please clarify following;   If I have qualified WPS with backing & qualified Welder without backing; with this can we weld single side welded joint without backing.Please reply me in the light of ASME SEC IX.   Thanks in advance   Ali Mhaskar

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[John Henning]

Backing is a non-essential variable, QW-402.5, for most common welding processes. 

ASME Section IX addresses non-essential variables in QW-200.1(c) thusly; 

“Changes may be made in the nonessential variables of a WPS to suit production requirements without requalification provided such changes are documented with respect to the essential, nonessential, and, when required, supplementary essential variables for each process.  This may be by amendment to the WPS or by use of a new WPS.”

So:

(1)  Your weld must be within the qualified ranges for all the essential variables and, if impact testing is required, supplementary essential variables.

(2)  Your WPS must be revised/or new WPS written to allow the “new” non-essential variable

(3)  Your weldor must be properly qualified per Article III (if required)

John A. Henning

Welding & Materials

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[Aly]

Dear Experts,   Thank you all for sparing time for reply;   Further, Can you advise on Mr. Vijayan Reply as he is saying that as I don't have qualified WPS without backing how can I qualify the welder without backing.   Can't I qualify a welder for "without backing" as per WPS without baking?     Ali Mhaskar

 

-------Original Message-------

[james gerald]

I suppose you have Qualified PQR (not WPS) with Backing. You can prepare a WPS without Backing using the same PQR as per ASME Sec.IX. Use this WPS for Welder Qualification without Backing.

 

Thanks & Regards J.Gerald Jayakumar 0091-9344954677

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From: Aly <mhask...@gmail.com>
To: material...@googlegroups.com
Sent: Saturday, February 4, 2012 10:48 AM
Subject: Re: [MW:13608] RE: 13596] WPS with baking for welding single side welded Joint without backing with qualified Welder without backing