GMAW instead of GTAW +SMAW

[rupeshj...@gmail.com]

Our contractor want to use GMAW process inplace of GTAW+SMAW
for cS pipe butt weld joint. Construction code is B31.3 . Can we quaLify OR use GMAW inplace of Gtaw+ smaw process. Pressure is 15 kg/cm2g with full RT. Pls advice?bscribe from this group, send email to materials-weld...@googlegroups.com
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[Karthik]

Hi, Normally GMAW is not allowed in piping and pressure vessel welding because of the more weld defects even which cannot identify in RT. But With proper application and appropriate parameters, excellent welds can be produced using short-circuit GMAW.  However, if the welder is not careful to follow established procedures, a number of serious weld defects can occur. The most significant of these defects is lack of sidewall fusion; the molten puddle of metal does not fully fuse with the pipe sidewalls, and a "cold lap" defect occurs.  This is a significant structural defect that is difficult to identify with commonly used nondestructive inspection methods such as radiography.  So while the GMAW and FCAW processes have gained popularity for many applications, they have not been considered serious options for most pipe welding operations. This poor reputation is no longer deserved, however.  Continuous development in both power supply and consumable technology have made this process a viable alternative to manual GTAW or shielded metal arc welding (SMAW) of pipe. 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 Thu, 10/14/10, rupeshj...@gmail.com <rupeshj...@gmail.com> wrote:

[John Du Plessis]

 

 

 

There is no reason no to use GMAW. Numerous examples of successful applications in pipe and pressure applications exists. Modern power sources and software makes the process easy to use.

 

Welding defects are not caused by the process but by the human operating with the process.

 

My only concern would be the pipe diameter. Manipulatio of the welding torch is more difficult with smaller diameter pipes.

 

 

John du Plessis

Technology Manager

 

Tel: +27 (11) 298 2100

Tel: +27 (11) 298 2103 (Direct)

Fax: +27 (11) 836 6014

Mobile:+27  82 883 4970

www.saiw.co.za

 

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[hany alfy]

You can use GMAW no problems

Use Metalloy Wires it is give good reuslts with the proper WPS/PQR

for CS Pipes u can use Metalloy 76 i attached the data for you here (Before it was Metalloy 71)

if u need any more pls contact me

Hani Alfe

---

From: Karthik <karth...@yahoo.com>
To: material...@googlegroups.com
Sent: Thu, October 14, 2010 8:08:22 AM
Subject: Re: [MW:7544] GMAW instead of GTAW +SMAW

[Clubb, Archie]

All

 

Agree with Karthic – the use of GMAW and FCAW are simply to speed up and cheapen the work ! – Bang goes the quality – Stick to the TIG as far as possible at roots.

 

 

 

Archie

 

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[limesh M]

Dear,

 

In process pipe work normally GTAW,SMAW and SAW are preferred.It doesn't mean that GMAW is forbidden.But many clients not much interested in GMAW process on their pipe work due to it's poor performance history.But one reputed main contractor approved this process(Automatic GMAW) for root and hot pass welding for thin walled mega bore(one person can easily walk through) carbon steel pipes for their air seperation Unit project.RT result of the welded joint was poor. Welding contractor's QC has no time to sit inside his office.Luckily I got a chance to see all defects (Thanks to God and the main contractor,It was a good experience for me).The thin walled pipes fit up was the major problem,even the mismatch goes upto 6 mm.The same process was used in heavy walled CS pipe spool fabrication in another project and the radiography result was good.In this case the fit up was too good.

 

 GMAW - Handle with care especially in pipe work.

 

Regards,

 

Limesh

[César Alexis Viteri Pérez]

Dear,
 
Here in Ecuador a pipeline diam 32" (cross country)  was welded with Gmaw STT its performace was good.
 
Regards
 

---

Date: Thu, 14 Oct 2010 14:52:43 +0400
Subject: Re: [MW:0] GMAW instead of GTAW +SMAW
From: lime...@gmail.com
To: material...@googlegroups.com

[pgoswami]

Rupesh,

If your contractor have access to GMAW-STT process,  it would be worth exploring the possibility. Here're some references.This process is well proven for quality pipe work fabrication. However everyone has to go through the learning cycle and would take a some time to  get a total grip of the process. You may have to increase the Q.C level to fully implement and get the desired level of quality.

Thanks.

Pradip Goswami,P.Eng.
Welding & Metallurgical Specialist & Consultant
Email-p...@sympatico.ca,
pgos...@quickclic.net

-----Original Message-----
From: material...@googlegroups.com [

mailto:material...@googlegroups.com] On Behalf Of rupeshj...@gmail.com
Sent: Wednesday, October 13, 2010 11:51 PM
To: material...@googlegroups.com

Subject: [MW:7543] GMAW instead of GTAW +SMAW

Our contractor want to use GMAW process inplace of GTAW+SMAW for cS pipe butt weld joint. Construction code is B31.3  . Can we quaLify OR use GMAW  inplace of Gtaw+ smaw process. Pressure is 15 kg/cm2g with full RT. Pls advice?

subscribe from this group, send email to materials-weld...@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.



     

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[srinivasan sethuraman]

Please check out Miller pipe welding and RMD process. They are also equally good and works well for carbon steel and stainless pipe welding. http://www.millerwelds.com/resources/articles/index.php?page=article125.html Thanks Srini --- On Wed, 10/20/10, pgoswami <pgos...@quickclic.net> wrote:

[Arientatcha Mrakpor]

Hi,

I need your technical advice on the use of SMAW qualified welders to participate on a GTAW procedure. Please note that initially we were using SMAW procedure but we decided to adopt an improved procedure, hence few welders were qualified on the GTAW.
My plan is to allow the welders on SMAW to fill and cap the root done by the GTAW welders.

Please advice me.

Alfred Arientatcha Mrakpor

[Saravanan Sornam]

Hi ,

Since you are changing the welding process from GTAW & SMAW combination process to GMAW only , you have to qualify a new PQR with few welders qualification for GMAW .

You have to see the Essential variables in ASME-IX code, before judging or revising the process, for your improvement .

Cheers,

Saravanan,

Korea

 

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[M.R.Kolahkaj]

Hi man,

SMAW qualified welders just could weld as fill & cap in the weld seams according to qualification parameters as thk, pos. & etc. regardless of any process for root pass.

Rgds.
~Reza
Houston-TX

http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm

 
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.

[Saravanan Sornam]

Dear Alfred Arientatcha Mrakpor ,

Yes, you can use SMAW Process as Fill and Cap with GTAW on root , provided you should have qualified WPS for this combination process to be allowed in production joint .

If you have GTAW & SMAW WPSs separately qualified , then you have to refer QW 200.4 ( b) requirements to fulfil .

Ensure this before you apply different processes in the same weld joint .

Cheers,

Saravanan,

Korea