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GMAW WELDING
- Thread starter RKGI
- Start date
Dhurjati Sen
Materials
Dear RKGI,
CO2 is pre-heated to prevent it from cooling and forming dry ice. Better explained in the link below.
Link
Regards.
DHURJATI SEN
Kolkata, India
CO2 is pre-heated to prevent it from cooling and forming dry ice. Better explained in the link below.
Link
Regards.
DHURJATI SEN
Kolkata, India
ironic metallurgist said:
When considering carbon steel and compared to argon based mixes:
Very economical cost-wise.
When set-up properly, welds are visually appealing, and penetration is much more substantial.
The devil is in the details; she also wears prada.
Guest
I love CO2 for FCAW, and with the quality of wires available these days there is no reason to pay more for gas.
I was referring to solid wire, based on GMAW mentioned in the OP. GMAW is only FCAW in ASME IX space.
"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
I was referring to solid wire, based on GMAW mentioned in the OP. GMAW is only FCAW in ASME IX space.
"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
GMAW and FCAW are two different welding processes.
GMAW uses solid bare electrode or metal cored electrodes. FCAW contains flux components inside a tubular electrode. ASME section IX differentiates between the two processes by the electrode product form when qualifying the WPS.
Nonferrous metals are typically welded using an inert shielding gas or a mixture of inert shielding gases when welded with GMAW. Ferrous metals are often welded using CO2 or mixed gases containing some percentage of CO2. The CO2 changes the surface tension to produce a weld with less convexity, i.e., a better profile, and it reduces the tendency to produce undercut when compared to a shielding gas composed of 100% Ar.
Flux cored electrodes can often be used with 100% CO2 or a mixture of CO2 and Ar. Increased amounts of Ar in the gas mix will increase the amount of Mn and Si alloyed with the base metal since less is utilized for the purpose deoxidizing the weld pool.
Best regards - Al
GMAW uses solid bare electrode or metal cored electrodes. FCAW contains flux components inside a tubular electrode. ASME section IX differentiates between the two processes by the electrode product form when qualifying the WPS.
Nonferrous metals are typically welded using an inert shielding gas or a mixture of inert shielding gases when welded with GMAW. Ferrous metals are often welded using CO2 or mixed gases containing some percentage of CO2. The CO2 changes the surface tension to produce a weld with less convexity, i.e., a better profile, and it reduces the tendency to produce undercut when compared to a shielding gas composed of 100% Ar.
Flux cored electrodes can often be used with 100% CO2 or a mixture of CO2 and Ar. Increased amounts of Ar in the gas mix will increase the amount of Mn and Si alloyed with the base metal since less is utilized for the purpose deoxidizing the weld pool.
Best regards - Al
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