Understand the Flux cored wire variants, characteristics & applications
Flux-cored wire, along with a GMAW machine, is a necessity for flux-cored arc welding (FCAW), and it has been around for quite some time now. It is typically available in the market under two compositions, namely folded and seamless. Folded wires are moulded into strips of U-shape, whereas seamless wires are composed of seamless steel pipe bands filled at the core.
A flux-cored wire is a popular choice for welding due to its versatility which enables it to be used for welding many alloys. It is important to have accurate information about the flux cored wire, its characteristics, and proper application to proceed before using it for welding. The following article aims to give you a proper insight into them to get you going.
Flux-cored wire variants and their characteristics
In order to work with flux-cored wire you need to understand its variants which are gas-shielded and self-shielded. They share a similar outer sheath that is filled with flux. Flux is essentially a compound of alloy and deoxidizers that prevent the weld from contamination.
Gas-shielded FCAW wire
This form of FCAW wire requires an external shielding gas supply to protect the metal during welding. The composition of the gas used is either Carbon dioxide or a blend of Argon Carbon Dioxide for the purpose of shielding.
Carbon Dioxide enables more penetration but generates a less stable arc whereas The Argon Carbon Dioxide blend reduces spatter and offers good stability. The Argon Carbon Dioxide mixture generates lesser fumes but has low penetration, which limits its application.
These wires are well suited for heavy duties which makes them suitable for the construction of pressure tanks and pipes in petrochemical industries the operators however have to make sure to protect that arc from wind which can blow away the shielding gas.
Self-shielded FCAW wire
There is no shielding gas present in a self-shielding FCAW wire; however, the shielding is generated as a result of flux within the wire which protects the weld. The self-shielding wire creates more fumes but it removes the hassle of carrying a gas cylinder making it extremely portable.
Self-shielded FCAW wire does not require gas which makes it ideal for outdoor welding. It is undoubtedly convenient and ideal to use in constructing bridges and repairing equipment.
Advantages and Disadvantages
It is important to understand the advantages and disadvantages of both variants of Flux cored wire to have a better understanding of its application.
The flux-cored wires are extremely easy and convenient to use for most types of welding applications. They are mostly contaminated free which makes the welding durable. The wire can also be used with multiple alloys depending on the base metal.
In terms of disadvantages, however, is the deposition of slag at welding which the operator has to remove once the welding is done. Usage of the flux cored wire can also be expensive compared to using solid wires.
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