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[MW:25469] Open Root Pipe Welding / Groove Welding with FCAW Process

By Materials & Welding

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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