Skip to main content

Re: [MW:6784] Re: Polarity qualification?

By Materials & Welding
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 <mengineer010@gmail.com> wrote:

From: Engineer Mech <mengineer010@gmail.com>
Subject: [MW:6759] Re: Polarity qualification?
To: "Materials & Welding" <materials-welding@googlegroups.com>
Date: Sunday, August 29, 2010, 2:25 PM

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 materials-welding@googlegroups.com
>
> To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
>
> For more options, visit this group's bolg athttp://materials-welding.blogspot.com/
>
> The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
>
> PREM S NAUTIYAL
> CELL : 9820313278

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

Comments

Post a Comment

Popular posts from this blog

Materails FAQs

By Materials & Welding
Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...
21 comments
Read more

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

By Materials & Welding
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.   Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
Post a Comment
Read more

Re: [MW:10788] ON PLOT PIPING & OFF PLOT PIPING

By Materials & Welding
Piping systems involved for the flow lines and gathering lines from the well head isolation valve to the production facility or processing plant isolation valve are determined as OFF PLOT. ON PLOT defines piping system in the processing plant and production platform. ANSI/ASME B31.4 applies for off plot piping system. B31.4 allows the use of either API 1104 or ASME section IX (as appropriate). However, occasionally, a very small system such as piping within 500 feet of a processing plant (some client also said 400 feet) may be declared B31.3 rather than B31.4. When B31.3 is invoked, only ASME Section IX is used. before you decide which code to use for welding procedure and/or welder qualification for pipe welding, you have to know the design and construction code applicable to the system. Please read far enough into scope and diagram illustrating the application of either B31.3 and B31.4 hope this helps rgds 2011/4/21 pradip kumar sil < pradipsil@gmail.com > Dear all, ...
Post a Comment
Read more