Mr. Pawar,
"Which welding is economical and qualitative, FCAW or MIG ".
Your question is very open ended question.What's the application, boiler and pressure vessels or structural's. The major and big difference to implement both the process are good welding machines. If you have a strict requirement of quality then GMAW would be the better choice.
However performing GMAW with consistent quality is not possible without state of art but expensive machines, such as STT(Lincoln) or RMD (Millerweld) or Fastmig (Kemppi). GMAW can generate quality and good productivity also.
On the contrary FCAW can work on tight budget, welding machines may not be so expensive, however the consumables may be more expensive than GMAW consumables. Once the right consumables, shielding gases are chosen this process is much easier to implement than solid wire GMAW.
Note operators' training and experiences are very important for both the processes. FCAW is more popular in structural fabrication, its' equally good in boiler and pressure vessel and offshore industry , but the requirement for quality (both welding process and welding metallurgy) has to be very consistent. On the contrary if good machines, good operators, reliable welding fillers are readily available GMAW can generate really astounding quality.
On the productivity aspect I would say both the processes are almost at par.
Pradip Goswami,P.Eng.,IWE.
Welding & Metallurgical Specialist & Consultant
Email-pgoswami@sympatico.ca,
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of PREM SHANKARDUTT NAUTIYAL
Sent: Thursday, December 09, 2010 6:21 AM
To: materials-welding@googlegroups.com
Subject: Re: Re: [MW:8636] Weld method
I have an opposite experience with what Mr.Karthik has mentioned in the trailing email.
GMAW produces lot of spatter and frequently welder has to change contact tips. LOF, silica inclusions defects are more.
FCAW produces very less spatter, good bead profile, better control and lesser defects. In fact we have achieved 100% RT/UT welds with FCAW. With FCAW you can weld with higher current densities, thus achieve more productivity than GMAW.
However cost of welding consumables of FCAW/kg is more than GMAW.
Regards
Prem Nautiyal
On Thu, 09 Dec 2010 14:36:10 +0530 wrote
>Hi,
When compared to FCAW and MIG, MIG is better than FCAW.
because GMAW can give excellent results. The finished weld has no slag and
almost no spatter. If the material you're welding is dirty, rusty, or
painted, you must clean it properly by grinding until you get shiny surface/bare metal. GMAW successfully with common commercial metals —
low-carbon steel, low-alloy steel, stainless steel, and aluminum.
better for root pass.
FCAW - more welding operator/welder control required,proper selection of electrode diameter related to thickness etc.,,if welder is not capable- poor bead,more spatter,incomplete penetration and FCAW mostly suits for thicker materials.some times can with thinner material with lesser dia of electrode.
but finishing/quality GMAW is better than FCAW.
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, 12/9/10, ashok pawar
From: ashok pawar
Subject: [MW:8626] Weld
method
To: materials-welding@googlegroups.com
Date: Thursday, December 9, 2010, 3:22 PM
Which welding is economical and qualitative, FCAW or MIG !
Regards,
Pawar A.R
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PREM S NAUTIYAL
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