1. Welded Wire Mesh
Submerged arc welding flux on the weld metal protection and metallurgical treatment, the main wire as a filler metal, while adding alloying elements to the weld, and participate in metallurgical reactions.
(1) low carbon steel and low alloy steel Welded Wire Mesh low carbon steel and low alloy steel submerged arc welding commonly used Welded Wire Mesh has the following three categories.
A, low manganese wire (such as H08A): often with high manganese flux for low carbon steel and low strength of low alloy steel welding.
B, manganese wire (such as H08MnA, H10MnS): mainly used for low alloy steel welding, but also with low manganese flux for low carbon steel welding.
C, high manganese wire (such as H10Mn2 H08Mn2Si): for low alloy steel welding
(2) high strength steel wire
Such Welded Wire Mesh containing Mn1% or more, containing Mo0.3% ~ 0.8%, such as H08MnMoA, H08Mn2MoA, for the high strength of low-alloy high-strength steel welding. In addition, according to the composition of high-strength steel and performance requirements, but also in the wire by adding NI, CR, V and Re and other elements to improve the weld performance. Tensile strength of 590Mpa grade weld metal used more MN-MO wire, such as H08MNMOA and so on.
(3) stainless steel wire
The Welded Wire Mesh composition is basically the same as that of the stainless steel to be welded. When welding chrome stainless steel, the Welded Wire Mesh of HoCr14 H1Cr13 H1Cr17 is used. When welding the chrome-nickel stainless steel, the Welded Wire Mesh of H0Cr19Ni9 HoCr19Ni9 HoCr19Ni9Ti is used. When welding ultra-low carbon stainless steel, Of ultra-low carbon Welded Wire Mesh, such as HOOCr19Ni9, etc., flux can be used smelting or sintering type, requiring the oxidation of the flux is small, in order to reduce the burning of alloying elements. At present, foreign mainly used sintered flux welding stainless steel, China is still mainly melting flux, but is the development and promotion of the use of sintered flux.
2. Welded Wire Mesh for gas shielded welding
Gas welding is divided into inert gas shielded welding (TIG welding and MIG welding), active gas shielded welding (MAG welding) and self-protection welding. TIG welding using pure Ar, MIG welding commonly used Ar + 2% O2 or Ar +5% CO2. MAG welding mainly used CO2 gas. In order to improve the process performance of CO2 welding, can also be used CO2 + Ar or CO2 + Ar + O2 mixed gas or the use of flux cored wire.
(1) TIG Welded Wire Mesh
TIG welding sometimes without filling the Welded Wire Mesh, welding material is heated and melted directly after the connection, and sometimes fill the filler wire, the protection of the gas is pure Ar, no oxidation, Welded Wire Mesh composition does not change after melting, so the wire composition is welding Seam ingredients. And some use of the base material as a wire component, so that the weld composition and the base material consistent. TIG welding when the welding energy is small, weld strength and plastic, good toughness, easy to meet the performance requirements.
(2) MIG and MAG Welded Wire Mesh
MIG method is mainly used for welding high-alloy steel such as stainless steel. In order to improve the arc characteristics, in the Ar gas by adding an appropriate amount of O2 or CO2 gas, that is, MAG method. When welding alloy steel, the use of Ar + 5% CO2 can improve the weld resistance to porosity. However, Ar + 5% CO2 mixed gas can not be used when welding ultra-low carbon stainless steel, only Ar + 2% O2 mixed gas can be used to prevent the weld from increasing carbon. MIG welding of low alloy steels is now being replaced by MAG welding of Ar + 20% CO2. MAG welding due to the protection of the gas has a certain degree of oxidation, should be appropriate to improve the wire Si, Mn and other deoxidizing elements, other ingredients can be consistent with the base material, can also be different. Welding high-strength steel, the weld C content is usually lower than the base material, Mn content should be higher than the base metal, which is not the right to deoxidation, but also weld alloy composition requirements. In order to improve the low temperature toughness, the weld Si content should not be too high.
(3) CO2 Welded Wire Mesh
CO2 is the active gas, with strong oxidation, so CO2 Welded Wire Mesh must contain high Mn, Si and other deoxidizing elements. CO2 welding is usually used C-Mn-Si wire, such as H08MnSiA, H08Mn2SiA, H04Mn2SiA and so on. CO2 Welded Wire Mesh diameter is generally 0.89 1.0 1.2 1.6 2.0mm and so on. Wire diameter ≤ 1.2mm belongs to the filament CO2 welding, wire diameter ≥ 1.6mm are coarse wire CO2 welding.
H08Mn2SiA wire is a widely used CO2 Welded Wire Mesh, it has a good process performance, suitable for welding 500Mpa below the low alloy steel. For higher strength requirements of the steel grade, should be used in the wire composition containing Mo element H10MnSiMo grade Welded Wire Mesh.
3. Electroslag Welded Wire Mesh
Electroslag welding for medium and thick plate welding. Electroslag Welded Wire Mesh is mainly filled with metal and alloying effect.