According to the structure of wire, flux-cored wire can be divided into a seam and seamless wire two. Seamless copper wire can be, good performance, low cost, has become in the future development direction.
Depending on whether the protection of gas, Gas Shielded Welding Wire and gas can be divided into self-shielded welding wire; core flux-cored wire electrode composition and the Ministry of drug powder is similar to the skin, with stable arc agent, deoxidizer, alloy slag forming agent and agent, According to the flux-cored wire without slag powder packing inner agent, can be divided into "powder type" wire and "metal powder-type" wire; by slag basicity, can be divided into titanium, titanium and calcium-type calcium-type wire .
Titanium slag flux cored wire bead forming beautiful, all-position welding into the process performance, stable arc, little splash, but the weld metal toughness and crack resistance is poor. In contrast, Ca-weld slag flux cored wire excellent ductility and crack resistance, but the weld forming and welding process performance somewhat less. Titania slag system somewhere between the between the two.
"Metallic powder-type" flux-cored welding process performance similar to the solid wire, the deposition efficiency and crack resistance is better than "powder type" wire. Most of the metal cored powder (iron, oxygen etc.), but also the stability of the arc adding special agents, can ensure welding slag, high efficiency, small splash, arc stability, weld diffusible hydrogen content and low crack resistance is improved.
Cross-sectional shape of the flux-cored welding process performance and metallurgical properties have a significant impact. According to the cross-sectional shape of the flux-cored wire can be divided into simple and complex O-shaped cross-section of two types of folding, folding shape can be divided into plum-shaped, T-shaped, E-shaped and intermediate filler wire-shaped and so on.
More complex cross-section shape of the flux cored wire, the more symmetrical, more stable arc, cored metallurgical response and protective effect more fully. However, with the wire diameter decreases, this difference gradually reduced, when wire diameter is less than 2mm, the impact has been cut into the shape of the obvious.
Flux-cored welding process performance, weld quality, adaptability of steel can be used for welding all types of steel, including low-carbon steel, low alloy high strength steel, low temperature steel, heat-resistant steel, stainless steel and hardfacing and so on. Used in protective gas with CO2 and Ar + CO2 two, the former for general structure, which has in important structures. Flux cored wire suitable for automatic or semi-automatic welding ground, arc have to be DC or AC.
1, mild steel and high strength steel with flux-cored wire
The majority of these wire titanium slag system, good welding process, welding production rate, is mainly used for shipbuilding, bridges, buildings, vehicles manufacturing. Low-carbon steel and high strength steel with flux cored wire, more varieties, from the weld tensile strength of 490MPa strength level point-and 590Mpa level of Welding Wire has been widely used; from a performance point of view, some focus on the process performance, and some focused on the mechanical properties and crack resistance welding, and some stand down for welding, including all-position welding, including, and some are dedicated to the fillet weld.
2, stainless steel with flux-cored wire
Stainless steel flux cored wire of mouth has been more than 20 species, in addition to chromium-nickel stainless steel flux cored wire, there are chromium stainless steel flux cored wire. 0.8,1.2,1.6 mm diameter wire, can meet the stainless steel sheet, plate and thick plate welding needs. The shielding gas used in the majority of CO2, but also can be used to Ar + (20% ~ 50%) CO2 gas mixture.
3, with flux-cored hardfacing
To increase the wear resistance or the metal surface to obtain some special properties, you need to wire in the transition from a certain amount of alloying elements, but the wire due to carbon content and alloying elements are more difficult to machine manufacturing. With the advent of flux cored wire, these alloying elements can be added to the core of medicine, and manufacturing convenience, so the use of flux-cored wire for submerged arc welding of wear-resistant surface is commonly used methods, and has been widely used. In addition, the sintered alloy elements added flux, surfacing after the corresponding component can also be surfacing layer, it is compatible with solid or flux-cored wire, welding can meet different requirements.
Common flux-cored welding and flux-cored wire submerged arc welding CO2 follows.
Filaments CO2 flux-cored wire welding welding efficiency of the method, the production efficiency of manual arc welding of 3 to 4 times; excellent welding performance, stable arc, little spatter, easy slag removal, welding forming beautiful. This method can only transition alloying elements is usually flux-cored wire, alloy composition used for the cladding layer is not too high.
Flux-cored wire submerged arc welding of large diameter (3.2, 4.0mm) flux-cored wire, welding current, welding productivity has improved significantly. When using burning flux, the flux transition alloying elements can also make a higher weld overlay alloy composition, the alloy content of 14% can be varied between 20% to meet different requirements. This method is mainly used for welding rolling roller, feed roller, roller wear and corrosion casting parts.