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
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:
-- 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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