GMAW for root pass can be done with Dip (or) Short circuit transfer.
It is successfully used in pipe joints also. Filler and cap passes done by Dip (or)
Globular transfer.
In fact, if your client accepts, full welding can be done with FCAW itself as it saves
inventory costs also.
In both cases, welders to be trained properly to maintain Current, Voltage, Stick out,
Torch & travel angle and weld speed to get Quality welds.
Best of Luck !
Sridhar.
From: 'anand gupta' via Materials & Welding <materials-welding@googlegroups.com>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Tuesday, 7 June 2016 10:20 AM
Subject: Re: [MW:24926] Jack up rig welding
Dear
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in higher thk material we can do GMAW AND FCAW AS PER QUALIFIED WPS.
REGARDS
A P GUPTA
-- On Tue, 7 Jun, 2016 at 5:35, Pravin G<htcispravin@gmail.com> wrote:Dear expert,
I'm seeking for your valuable technical advice.
Currently we are working on jack up rig project.
Client insist to use GMAW process for root pass and continue with FCAW.
Section: chord and rack
Thickness:100mm
Root cap: 2-3mm
Material: ABS EQ70
In my experience, for root welding mostly GTAW or SMAW is preferred.
I have explained to client using GMAW process might cause burn through or lack of fusion due to high welding current and travel speed.
Kindly advice if GMAW process is advisable to use? Appreciate your valuable advice.
Pravin Poornachandran
Singapore (JWES)
Sent from my iPhone
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