1. Submerged arc welding Welded Wire Mesh
Submerged arc welding flux on the metal from the role of protection and metallurgical treatment, the main Welded Wire Mesh as a filler metal, while adding alloying elements to the weld, and participate in metallurgical reactions.
(1) low carbon steel and low alloy steel welding Welded Wire Mesh low carbon steel and low alloy steel submerged arc welding commonly used welding Welded Wire Mesh has the following three categories.
A, low manganese Welded Wire Mesh (such as H08A): often with high manganese flux for low carbon steel and low strength low alloy steel welding.
B, manganese Welded Wire Mesh (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 Welded Wire Mesh (such as H10Mn2 H08Mn2Si): ??for low alloy steel welding
(2) high strength steel Welded Wire Mesh
Such welding 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 Welded Wire Mesh by adding NI, CR, V and Re and other elements, improve the weld performance. Tensile strength of 590Mpa grade weld metal used more MN-MO Welded Wire Mesh, such as H08MNMOA and so on.
(3) stainless steel Welded Wire Mesh
The welding Welded Wire Mesh composition is basically the same as that of the stainless steel to be welded. When welding the chrome stainless steel, the welding Welded Wire Mesh of HoCr14 H1Cr13 H1Cr17 is used. When welding the chrome-nickel stainless steel, the welding Welded Wire Mesh of H0Cr19Ni9 HoCr19Ni9 HoCr19Ni9Ti is used. When welding ultra-low carbon stainless steel, Of ultra-low carbon welding Welded Wire Mesh, such as HOOCr19Ni9, etc., flux can be used smelting or sintering type, require the oxidation of the flux is small, 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. Welding Welded Wire Mesh for gas shielded welding
Gas shielded 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 use CO2 gas. In order to improve the process performance of CO2 welding, CO2 + Ar or CO2 + Ar + O2 mixed gas or flux cored Welded Wire Mesh can also be used.
(1) TIG welding Welded Wire Mesh
TIG welding sometimes without filling the welding Welded Wire Mesh, welding material is heated and melted directly connected, and sometimes filled with welding Welded Wire Mesh, the protection of the gas is pure Ar, no oxidation, welding Welded Wire Mesh after the composition does not change, so the Welded Wire Mesh composition is welding Seam ingredients. And some use of the base material as the Welded Wire Mesh composition, 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 welding 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 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 Welded Wire Mesh 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 right to deoxidation, but also the requirements of weld alloy composition. In order to improve the low temperature toughness, the weld Si content should not be too high.
(3) CO2 welding Welded Wire Mesh
CO2 is the active gas, with strong oxidation, so CO2 welding Welded Wire Mesh must contain high Mn, Si and other deoxidizing elements. CO2 welding is usually used C-Mn-Si Welded Wire Mesh, such as H08MnSiA, H08Mn2SiA, H04Mn2SiA and so on. CO2 welding Welded Wire Mesh diameter is generally 0.89 1.0 1.2 1.6 2.0mm and so on. Welded Wire Mesh diameter ≤ 1.2mm are filament CO2 welding, Welded Wire Mesh diameter ≥ 1.6mm are coarse Welded Wire Mesh CO2 welding.
H08Mn2SiA Welded Wire Mesh is a widely used CO2 welding Welded Wire Mesh, it has a good process performance, suitable for welding 500Mpa below the low alloy steel. For steel grades with higher strength requirements, Welded Wire Mesh of H10MnSiMo with Mo element in the Welded Wire Mesh composition should be used.
3. Electroslag welding Welded Wire Mesh
Electroslag welding for medium and thick plate welding. Electroslag welding Welded Wire Mesh mainly serves to fill the metal and alloying.