Polarity difference in WPS

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Lalu r p

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May 25, 2013, 7:01:20 AM5/25/13
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Dear Experts

In my company we have a wps qualified in last year with AWS D1.1 for structural steel welds.But now the client has raised a problem that in that wps the polarity of the electrodes which is used for the root run is wrong.The electrode used was E-7016-1 and as per standard the polarity should be +ve. But in place of that we used -ve polarity and the PQR is qualified with that.Since I am new to this company I have to solve the issue for submitting the final dossier.So my question is that whether  this WPS can be revised without re-qualification.

Thanks & Regards 

LALU R.P
QA/QC ENGINEER 

Malusare Vijay

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May 25, 2013, 7:15:44 AM5/25/13
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Yes You Can Revised without re -qualification.


Regards,
Vijay Malusare


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bruce alavi

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May 25, 2013, 10:36:35 AM5/25/13
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Agree with Vijay you can revise the WPS with -ve polarity without the need for requlification .
 
Very Best Regards
Behrooz Alavi

From: Malusare Vijay <vijayma...@gmail.com>
To: material...@googlegroups.com
Sent: Saturday, May 25, 2013 2:15 PM
Subject: Re: [MW:17794] Polarity difference in WPS
Yes You Can Revised without re -qualification.


Regards,
Vijay Malusare
On Sat, May 25, 2013 at 4:31 PM, Lalu r p <lal...@gmail.com> wrote:
Dear Experts

In my company we have a wps qualified in last year with AWS D1.1 for structural steel welds.But now the client has raised a problem that in that wps the polarity of the electrodes which is used for the root run is wrong.The electrode used was E-7016-1 and as per standard the polarity should be +ve. But in place of that we used -ve polarity and the PQR is qualified with that.Since I am new to this company I have to solve the issue for submitting the final dossier.So my question is that whether  this WPS can be revised without re-qualification.

Thanks & Regards 

LALU R.P
QA/QC ENGINEER 
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james gerald

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May 25, 2013, 7:32:05 AM5/25/13
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Yes Polarity is an Essential variable according to AWS D1.1, Table 4.5  Point 13). You need to Qualify a new PQR if you change the polarity.
 
 
 
Thanks & Regards

J.Gerald Jayakumar
00968-99438165
Sent: Saturday, May 25, 2013 3:15 PM

Subject: Re: [MW:17794] Polarity difference in WPS
Yes You Can Revised without re -qualification.


Regards,
Vijay Malusare
On Sat, May 25, 2013 at 4:31 PM, Lalu r p <lal...@gmail.com> wrote:
Dear Experts

In my company we have a wps qualified in last year with AWS D1.1 for structural steel welds.But now the client has raised a problem that in that wps the polarity of the electrodes which is used for the root run is wrong.The electrode used was E-7016-1 and as per standard the polarity should be +ve. But in place of that we used -ve polarity and the PQR is qualified with that.Since I am new to this company I have to solve the issue for submitting the final dossier.So my question is that whether  this WPS can be revised without re-qualification.

Thanks & Regards 

LALU R.P
QA/QC ENGINEER 
--
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kannayeram gnanapandithan

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May 25, 2013, 7:56:14 AM5/25/13
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It is a cross violation ( ASME Sec 2 Part C , SFA 5.1, Usability of Electrodes- Type of Current & Polarity)
Even though it is not essential variables as per AWS D1.1, it is not good engineering Practice. u can revise the WPS
Pandithan
Welding Consultant
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jiji lal

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May 26, 2013, 1:32:17 AM5/26/13
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SINCE POLARITY FALLS UNDER THE ESSENTIAL VARIABLES CATEGORY IN  AWS D.1.1, YOU 'VE TO REQUALFY WITH A WPS BY SHOWING +VE / -VE.
JIJILAL K M
Dy.Manager -Welding
Tecpro Infra Projects Ltd

Nandesh Kumar

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May 26, 2013, 10:05:49 AM5/26/13
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Lalu,

Your statement
"The electrode used was E-7016-1 and as per standard the polarity should be +ve", is, as per which standard?

Anyway, the intention of making a WPS is to get a sound weld and you have achieved it already last year. Now why you want to change it? Let it be as it is. (it is unusual that you have used DCEN for E7016, instead of DCEP or AC, which is usual).

If you change the polarity, then you have to requalify your WPS as per D1.1. Hence, proceed with the production with the existing WPS, if it meets the weld integrity requirements.

ವಂದನೆಗಳೊಂದಿಗೆ / Best regards,

Nandesh Kumar Arasappa

P.S. : Please don't print this e-mail unless you really need to.


--- On Sun, 26/5/13, jiji lal <jiji...@gmail.com> wrote:

kannayeram gnanapandithan

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May 27, 2013, 1:23:23 AM5/27/13
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As per AWS D1.1 -2010 edition, Polarity for SMAW process also became Essential variables ( It is not so in the Earlier Edition of D1.1) so new procedure is to be made for change of polarity.
Pandithan
Welding Consultant
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