Tuesday, September 17, 2013

Re: [MW:18680] Multiple process GTAW+SMAW Process,

Hi sir,

It is 42"NB pipe with WN flange. so my question is , whether i can use single process alone to do welding, where i got approved wps GTAW+SMAW process? as per Qw-200.4 (a) 1, 2..

For the welder qualified is GTAW+SMAW process. So i want use this welder to do the above said joint with  by back-gouging. Becoz for welder it is essential variable backing.


On Monday, September 16, 2013 9:03:03 AM UTC+3, saravanan sornam wrote:
Dear San ,

As U said, the WPS is for Piping Welding works, 

are you planning to use SMAW only for piping ? Then, what is the Pipe Size for production Joint ? What is the weld metal deposit thk for SMAW ?

E7018 cannot be used for Single V for piping if not access , unless you use SMAW for the plates only, welded on both sides , after back gouging Or Grinding.

Regards,
Saravanan,
Korea


On Mon, Sep 16, 2013 at 1:50 AM, shankar narayan karanth <karanthe...@gmail.com> wrote:
Dear San,

One is permitted to carry out the welding by only one of the two or
more processes used for the qualifying procedure povided 2T
requirement of the weld metal deposited is valid for each of the
process employed.

P.S.KARANTH.

On 9/14/13, Weld Giant <mksa...@gmail.com> wrote:
> Hello welding expert,
>
>
> We have approved WPS, GTAW+SMAW ( ER70S2+E7018) Process for piping welding
> works. Shall we use only SMAW process with back chipping  as per QW -200.4
> (a)  paragraph.1, 2 for the single V groove joint.
>
> san
>
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