Re: [MW:25631] Re: Open Root Pipe Welding / Groove Welding with FCAW Process

FCAW not recommended as it is high heat input process . The toughness of the root is affected  . The most important is to control the heat input at root as it is the most important run in the weld . That why GTAW is mostly recommended and it's a clean process . STT Lincoln or RMD miller is ideal as the current characteristic is well controlled and therefore the heat input . So to be on safer avoid FCAW for X-ray quality weld .

On 30 Oct 2016 4:54 p.m., "'c sridhar' via Materials & Welding" <materials-welding@googlegroups.com> wrote:

1. It will be difficult  to get consistent root penetration for 8.00  mm thick  200 mm dai. 

    pipe using 1.20 mm wire in FCAW manual or auto process. It may work out for a higher thickness

    and larger size.

2. For 8 mm thick. 0.80 could be ideal and that size is not available in FCAW process.

3. Using GMAW (+) FCAW is gain not practical for 8 mm thick and also not economical.

4. GMAW process with Argon + CO2 as shielding gas may help with two pass technique.

    Again, LF may at times may affect X-ray quality 

5. Alternatively you can try Pulsed Auto TIG process with Argon gas. It may meet your requirement.

Sridhar. 

09444971077

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From: Vishwas Keskar Welding Manager Pune India <vvkeskar123@gmail.com>

To: Materials & Welding <materials-welding@googlegroups.com>
Sent: Wednesday, 5 October 2016 9:53 PM
Subject: [MW:25487] Re: Open Root Pipe Welding / Groove Welding with FCAW Process

STT process - LINCOLN will give excellent root pass quality including RT satisafctory

On Tuesday, October 4, 2016 at 2:06:35 PM UTC+5:30, Gopi Krishna Banerjee wrote:

Dear sir / experts, 

I need help for welding a M.S. Pipe  with Mechanized FCAW Process for root pass to get good penetration for X-ray ( without backing strip & back gouging ) Wire, E71T-1. Dia, 1.2 mm.  Shielding  Gas,  100 % CO2.  Pipe  Dia  200mm. Wall Thickness 08.00mm. Welding  Position 1GR.

Please give me some guidelines  for above welding operation . Like,  voltage, Amps, and wire speed, travel speed, stick out,  torch angle, gas flow rate for root run  & other subsequent  run.

Few Engineers say that FCAW  are  not be recommended for open root run. They advised for  root  run  weld with GMAW process & subsequent run  by FCAW process. And I found in  ESAB Welder Guide Book . Page No. 16.  they are also  not recommended  root run  by FCAW.  on Pipe  &  Plate both.

My queries are as follows :

1.     Is it possible to weld a root run for X quality penetration  with  FCAW Process?

2.    There is any restriction for root  run welding  with FCAW   by any Welding Codes  like ASME Sec. IX, AWS D1.1. or  ISO 15614. ?

Thanks & Regards.

G. K. Banerjee.

Welder  Trainer.

NAGPUR. ( India )

M-09764555112. 09423632112.

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