Thursday, October 14, 2010

Re: [MW:7547] GMAW instead of GTAW +SMAW

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 <karthik6684@yahoo.com>
To: materials-welding@googlegroups.com
Sent: Thu, October 14, 2010 8:08:22 AM
Subject: Re: [MW:7544] GMAW instead of GTAW +SMAW

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, rupeshjambhale@gmail.com <rupeshjambhale@gmail.com> wrote:

From: rupeshjambhale@gmail.com <rupeshjambhale@gmail.com>
Subject: [MW:7543] GMAW instead of GTAW +SMAW
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Date: Thursday, October 14, 2010, 10:50 AM

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-welding-unsubscribe@googlegroups.com
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