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Flux-cored and solid wires

日期:2015-01-17

Flux cored wire is the powder volume in the metal tube inside the wire, is widely used in recent years, efficient shipyard welding materials. It combines the advantages of electrodes and solid wires, spatter, stable welding arc soft, all-position welding, continuous welding.

Powder role:
1) stable arc Na, K and other ingredients through the Na +, K + and other ions of, during the welding process stabilizes the arc. (Na, K, etc.)
2) the mechanical properties of the deposited metal stabilization add Mg, Al, Si, Mn, etc. deoxy elements to eliminate weld metal oxygen, preventing the generation of holes in welding, thereby increasing weld metal strength and toughness.
3) promote the formation of alloys
Si, Mn, Ni, Cr, Mo and other elements can contribute to the formation of the deposited metal alloy to improve the properties of the deposited metal, Si and Mn to maintain adequate strength and toughness of the deposited metal, Ni can improve the impact of low-temperature metal toughness, Cr and Mo can improve the weld metal crack resistance.

Forming 4) welding slag
    Powder produced in the welding process a large amount of weld slag, solidified and adhered to the surface of the weld metal, weld metal to prevent quenching after compaction, helps remove hydride, thereby to improve the basic properties of the weld metal.
5) protective gas
FCW component product, a portion of the powder gases generated in welding, it is possible to ensure the stability of the arc welding process, to prevent weld nitriding and oxidation, the protection of the chemical composition of deposited metal, to improve its mechanical properties.

Product Categories
   Flux cored wire products, depending on the composition of the powder inside, divided into two kinds of titanium and alkali, titanium TiO2 due to add more ingredients, with enabling weld appearance, all-position welding workability and other characteristics, but compared to the base type and impact toughness and crack resistance is poor. Representatives of titanium metal products SF-71, Supercored71 other basic type of representative products are Supercored70B like.
 

After welding with other methods, depending on whether the slag can be divided into slag type, metal powder type, slag type is characterized in the welding process since dross and may be used to produce all-position welding, metal powder type because a small amount of welding slag, can only be applied under the welding. Most belong to the slag-type flux cored wire products, metal powder type products on behalf of SF-70MX, Supercored 70NS.

Protective gas
Flux cored wire products, many using 100% CO2 and 80% Ar + 20% mixed gas to protect the gas, there are a lot of products do not use a shielding gas flux cored wire products must use the specified protective gas,if the use of a non-specific protective gas, can cause changes in the deposited metal alloy components, causing changes in the mechanical properties of the deposited metal, resulting in low (of course workability than when using the specified protective gas welding performance low) using CO2 and Ar shielding gas, with a solid wire welding time, welding wire shape shown in Figure 3, an arc shape shown in Figure 4, using Ar shielding gas, then, appears SPRAY, then the greater the arc, there will be focus of the poor, the weld width, melting into reducing the phenomenon.

Flux-cored and solid wires
Although the use of the flux cored wire and solid wire of the same welding method, however, and as compared to solid wire has the following advantages and disadvantages. .
 

Advantage
1. welding speed
     Under the welding, welding level when cored wire about 10% faster than the solid wire welding speed, especially legislation to welding (Vertical) and overhead welding (over head) when, according to the role of the powder can be high current welding, it is possible to more than double the speed.
2. You can be all-position welding
     Solid wire welding in a horizontal or on request welders to weld when welding high skills, will generate a lot of splash, it only applies to sheet metal welding, flux-cored but because of slag produced fully covering the welded parts therefore suitable for all-position welding.

3. small splash
Flux-cored and solid wires splash smaller than continuous use will not clog the gun mouth.
4. workability
Flux-cored arc welding soft, welding workability for easy operation.
Cons:
1. The low deposition efficiency flux cored welding because after a large amount of slag deposition efficiency so as about 88%, while the solid wire because there is no welding slag, deposition efficiency of about 95%

2. The big smoke
In the flux-cored welding process relatively large dust
3. expensive
Calculated in units according to kilograms, although more expensive price cored wire, but if the calculated angle of improving productivity, then, it can save cost.
 

 



 

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