Regarding gas shielded welding, CO2 gas shielded welding, FCAW
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Everyone, there is a claim that FCAW (Flux-Cored Arc Welding) is not recommended for use on welds of pressure vessels in categories A and B (some also say it should not be used on pressure-bearing components). I’ve read some discussion posts stating that GMAW should not be used on such components. I’m confused – are FCAW and GMAW the same thing? Moreover, in some posts FCAW is equated with CO2 GMAW; does that mean FCAW must necessarily be CO2 GMAW? Those who know can please explain.
Why isn’t anyone answering? Please help, thank you.
Your question is too technical; it would be best if a friend who works at a manufacturing plant could answer it for you. But in my personal opinion, the two should not be confused; gas shielded welding can indeed be used for welding pressure-bearing components! Reminder: You have been registered for over a month and are now eligible to advance to the second grade. Go to the Forum Wealth Center to claim your wealth – by doing so, you will have more funds to download additional materials, and your reading privileges will also be improved! !
Urgent, can someone please answer?
No! CO2 is just one of the gas shielding welding methods; some articles state that it is not recommended for use on pressure vessels, but it has significant advantages in terms of work efficiency. Our company plans to adopt this method in 2008!
CO2 gas shielded welding can be used on pressure-bearing components, but the purity of the CO2 gas must be at least 99.99%
Flux-cored wire arc welding is a welding method that relies on the slag and gases formed by the reaction of the flux-cored wire at high temperatures to protect the welding area; it is a type of gas shielded metal arc welding. The welding wire used is a tubular type, with flux of various compositions inside the tube. During welding, an external shielding gas is used, mainly CO2. The flux decomposes or melts when heated, serving functions such as slag formation, alloy infiltration, and arc stabilization. When no protective gas is used in flux-cored wire arc welding, it is called self-shielded flux-cored wire arc welding, with the gas generated by the decomposition of the flux inside the tube serving as the protective gas. With this method, changes in the dry elongation of the welding wire do not affect the shielding effect, and such changes can be quite significant. It can be applied to the welding of various thicknesses and types of joints in most ferrous metals.
Appropriate welding materials should be selected, and they can be used after passing process evaluations. The problem is that wire production in China lags behind that in foreign countries; there are very few wires that are compatible with the materials used in pressure vessels, which is why their widespread use is not possible.
You still haven’t told me that FCAW and MIG welding are not the same thing
They are not the same thing; FCAW can also be used with gas shielding, as well as without gas shielding. MIG welding has a wide range of applications, including both solid wire and cored wire types. No need to go into details