Thursday, February 10, 2011

Re: [MW:9804] Backing by gas/Back purging is not essential for P.No 8 - Austentic stainless steel? - ASME Sec 9

Srinivas,

AS per ASME Sec.IX, Backing Gas is not an essential variable for P.No.8 materials but the applicable Client specification will cover this aspect and make it mandatory to use Backing Gas for stainless steel.

Basically you cannot weld materials greater than 5% Chromium and Non ferrous metals without Backing Gas. The entire weld will be Blackish with lot of porosities and it will not pass Radiography testing.

Hence it is always good engineering practice to use Backing Gas for single sided welds of P.No:8 stainless steels.


J.GERALD JAYAKUMAR 00919344954677  


--- On Thu, 2/10/11, Srinivas Engr <srinivas.gmsrini@gmail.com> wrote:

> From: Srinivas Engr <srinivas.gmsrini@gmail.com>
> Subject: [MW:9798] Backing by gas/Back purging is not essential for P.No 8 - Austentic stainless steel? - ASME Sec 9
> To: "Materials & Welding" <materials-welding@googlegroups.com>
> Date: Thursday, February 10, 2011, 6:32 AM
> Dear All,
>
> As per QW 256, GTAW process,
> QW 408 Gas, There is no essential variable for gas Backing
> for P.No.
> -8. Austentic Stainless Steel. A312 & others.
> So we can qualify WPS without gas backing/Bsckpurging.
> Am i right or not?
> Pl clear me
>
> Regards
> Srinivas
>
> --
> 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.

No comments:

[MW:34820] RE: 34813] Clarification in Rate of heating and cooling.

Hello,   Please see the response below.   Regards.   P. Goswami, P. Eng, IWE.   From: materials-welding@googlegroups.com <materials-weld...