Polarity qualification?

[Engineer Mech]

Dear all


If one qualifies in DCEP for SMAW,
Whats the range qualified for those either DCEP only or both (DCEP&
DCEN)?
any limits given in specs? where?


Thanks

[PREM SHANKARDUTT NAUTIYAL]

Hi

If you refer ASME Sec IX, QW-253 table, which talks about the welding variables procedure specifications for SMAW, then refer QW-409.4 (electrical characteristics), which mentions that a change in current or polarity is Supplementary essential variable for Impact requirements and Non-Essential variable for Non-impact requirements.
What is your case?


Regards

Prem Nautiyal

On Sat, 28 Aug 2010 15:26:12 +0530 wrote

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PREM S NAUTIYAL
CELL : 9820313278

[Engineer Mech]

Hi,

in 409.4, tat given as change in polarity?
For ex, My job is to be done with E 7016 DCEN, & E7018 DCEP.
i have qualified welder wit DCEP.
Is he qualifies to weld wit DCEN or not? Either in supplementary
essential or non essential.. how it will be?
pl explain........



On Aug 28, 3:28 pm, "PREM SHANKARDUTT NAUTIYAL"

<prem_nauti...@rediffmail.com> wrote:
> Hi
>
> If you refer ASME Sec IX, QW-253 table, which talks about the welding variables procedure specifications for SMAW, then refer QW-409.4 (electrical characteristics), which mentions that a change in current or polarity is Supplementary essential variable for Impact requirements and Non-Essential variable for Non-impact requirements.
> What is your case?
>
> Regards
>
> Prem Nautiyal
>
> On Sat, 28 Aug 2010 15:26:12 +0530  wrote
>
> >Dear all
>
> If one qualifies in DCEP for SMAW,
>
> Whats the range qualified for those either DCEP only or both (DCEP&
>
> DCEN)?
>
> any limits given in specs? where?
>
> Thanks
>
> --
>
> To post to this group, send email to material...@googlegroups.com
>
> To unsubscribe from this group, send email to materials-weld...@googlegroups.com
>

> For more options, visit this group's bolg athttp://materials-welding.blogspot.com/

[prem_nautiyal]

Hi

If you are referring ASME Sec IX, then as per the table of QW-253 which talks about welding variables procedure specifications, refer QW-409.4 (Electrical characteristics), change in current or polarity is considered as supplementary essential variable for Impact requirements and Non-essential if you don't have any Impact requirements.

Regards

Prem Nautiyal

On Sat, 28 Aug 2010 15:26:12 +0530 wrote

--

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[Karthik]

Hi, For Welder Qualification,SMAW polarity is not an essential variable(QW353).If he qualifies with DCEP he can qualify for both. But for PQR,Change in polarity is a supplementary essential variable.Then you have to follow QW409.4.     Thanks & Regards,   (karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282 --- On Sat, 8/28/10, prem_nautiyal <prem_n...@rediffmail.com> wrote:

[Karthik]

Hi, As per QW353 for SMAW,Change in polarity is not an essential variable.He can weld with both. But as per QW356 for GTAW, change in polarity is an essential variable.So if the welder qualified with DCEP,he can weld only with DCEP.If you want to use him to weld with DCEN,then he have to qualify again with DCEN.

Thanks & Regards,   (karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282

--- On Sun, 8/29/10, Engineer Mech <mengin...@gmail.com> wrote:

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