GTAW for pipe below 2"

[tong tong]

Dear all members,

I need your opinion and advise..it is mandatory to weld piping 2" and below with full GTAW..if yes which spec. or code we refer..Could anyone explain to me the advantage of full GTAW on welding of piping 2" and below..Thank in advance for your cooperation

Regards

Suhairi

[Sukamal Naskar]

Code doesn't guide for the selection of welding process with respect to pipe / tube diameter. It's a common practice, it the dia is <= 2" , we prefer full GTAW.  But for non standard pipes , if the thickness is more, we can go for GTAW & SMAW. I have an experience of such kind of nozzle, 2" dia & thickness 17mm, we used GTAW & SMAW.

The advantage is better control in smaller diameter & less heat input in GTAW process.

 

Regards

Sukamal

--
Sukamal Naskar
Malaysia

[PB HEGDE]

Dear Suhairi

There is no mandatory clause to weld GTAW only, But for below 2 “ pipe welding ,you can not have back gouging  due to accessibility  constrain , Therefore GTAW is preferred, as we can get  good full penetration  and welder is comfortable. Moreover thickness is small where you can continue with single GTAW process to save the time. For better weld quality , use Pulse TIG or Up slope and down slope technique. Therefore for smaller dia pipe welding GTAW is preferred

 

Regards

 

Hegde P.B.

[tong tong]

Thank you for your valuable response

[tong tong]

Thank you for your valuable response

On Mon, May 11, 2009 at 8:00 PM, PB HEGDE <hegd...@isgec.com> wrote:

Dear Suhairi

There is no mandatory clause to weld GTAW only, But for below 2 “ pipe welding ,you can not have back gouging  due to accessibility  constrain , Therefore GTAW is preferred, as we can get  good full penetration  and welder is comfortable. Moreover thickness is small where you can continue with single GTAW process to save the time. For better weld quality , use Pulse TIG or Up slope and down slope technique. Therefore for smaller dia pipe welding GTAW is preferred

 

Regards

 

Hegde P.B.

 

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of tong tong
Sent: Monday, May 11, 2009 4:43 PM
To: material...@googlegroups.com
Subject: [MW:2145] GTAW for pipe below 2"

 

Dear all members,

[Shashank vagal]

Hi Suhairi, As the job gets more curved, manipulation for welding (heat input control and access) becomes rather tricky. Root pass is the most critical phase in all welding. GTAW caters to all these serious aspects, hence in case of small dia/small thicknesses, full GTAW is recommended. At the same time, in case of large thicknesses, if you use GTAW for root pass, a sound root can be ensured. On a sound root, good subsequent passes can be easily built up. All that you say, must however, be proven by running a PQR. Rgds, S Vagal      --- On Mon, 11/5/09, Sukamal Naskar <sukama...@gmail.com> wrote:

From: Sukamal Naskar <sukama...@gmail.com> Subject: [MW:2147] Re: GTAW for pipe below 2" To: material...@googlegroups.com Date: Monday, 11 May, 2009, 5:53 PM

Code doesn't guide for the selection of welding process with respect to pipe / tube diameter. It's a common practice, it the dia is <= 2" , we prefer full GTAW.  But for non standard pipes , if the thickness is more, we can go for GTAW & SMAW. I have an experience of such kind of nozzle, 2" dia & thickness 17mm, we used GTAW & SMAW. The advantage is better control in smaller diameter & less heat input in GTAW process.   Regards Sukamal

On Mon, May 11, 2009 at 7:12 PM, tong tong <ton...@gmail.com> wrote:

Dear all members, I need your opinion and advise..it is mandatory to weld piping 2" and below with full GTAW..if yes which spec. or code we refer..Could anyone explain to me the advantage of full GTAW on welding of piping 2" and below..Thank in advance for your cooperation Regards Suhairi

-- Sukamal Naskar Malaysia Cricket on your mind? Visit the ultimate cricket website. Enter now!