First, the arc length
The length of Mig Welding Rod coatings and drug skin type and thickness of a relationship. But it should be possible to take a short arc, especially low hydrogen electrodes. Arc length may cause holes. Short arc to avoid the atmosphere of O2, N2 and other harmful gases penetrated weld metal, the formation of oxides and other undesirable impurities affect the weld quality.
Second, the welding speed
Electrode suitable for welding speed is the diameter, the type of paint, welding current, welding material is heat capacity, structure, beginning with the corresponding changes in other conditions, can not make standards. Maintain appropriate welding speed, the slag can be well covered with a melt pool. To various impurities within the melt pool and the gas leak sufficient time to avoid the formation of weld slag and porosity. Welding rods, such as transport in too fast, welding parts cooling, shrinkage stress increases, the weld cracks.
Wire selected points
Wire should be selected according to types of welded steel, welding quality components, welding construction conditions (thickness, groove shape, welding position, welding conditions, weld heat treatment and welding waiting), costs, etc. into account. Wire used to be considered in the following order: â‘  According to the structure of steel welded wire for the selection and low alloy high strength steel, carbon steel, mainly on the "other strong match" principle, choose to meet the requirements of the mechanical properties of wire. For heat-resistant steel and weathering steel, the main focus of weld metal and the base material of the same chemical composition similar to meet the heat resistance and corrosion resistance requirements. â‘¡ According to the quality requirements of the welded parts (especially toughness) to select wire and welding conditions, groove shape, protect the gas mixing ratio and other process conditions, and to ensure performance under the premise of welded joints, welding choice for maximum efficiency and reduce the cost of welding material welding. â‘¢ According to the on-site welding position corresponds to the thickness of selected pieces by welding the wire diameter used to determine the current value used in reference to each manufacturer's product description information and experience, choose the suitable welding wire position and the use of current grade . Arc welding process performance, including stability, particle size and the number of splash, slag removal, weld appearance and shape. For welding of carbon steel and low alloy steel (especially semi-automatic welding), mainly based on welding performance to select welding methods and welding materials.
2, the selection of solid wires
â‘´ submerged arc welding wire submerged arc welding wire and flux is the consumption of materials, from carbon steel to high nickel alloy welding a variety of metal materials can be used with Welding Wire  and flux for submerged arc welding. Submerged arc welding wire selection is necessary to consider the effects of flux composition, but also consider the impact of the base metal. In order to get different composition and mechanical properties of welds, can use a flux (mainly smelting flux) and with several wire, you can also use a wire with several flux (mainly agglomerated flux) with. A, low-carbon steel and low alloy steel with low carbon and low alloy steel welding wire submerged arc welding wire commonly used in the following three categories: â‘  low-manganese wire (such as H08A) often used for low flux of high manganese steel with lower strength low-alloy steel welding. â‘¡ manganese wire (such as H08MnA H10MnSi) is mainly used for welding low-alloy steel, flux can also be used with low-manganese low-carbon steel welding. â‘¢ high manganese wire (H10Mn2 H08Mn2Si) for low alloy steel welding. B, low alloy high strength steel with low alloy high strength steel wire with a wire containing Mn 1% or more, with Mo 0.3% -0.8%, such as H08MnMoA, H08Mn2MoA, for high strength low alloy high strength steel welding. Moreover, according to the composition of low alloy high strength steel with the use of performance requirements, but also in the wire by adding Ni, Cr, V and RE and other elements to improve weld performance. Intensity level 590Mpa class weld metal Mn-Mo system to use more wire, such as H08MnMoA, H08Mn2MoA, H10Mn2Mo and so on. C, stainless steel with stainless steel welding wire, welding wire used in components with welded stainless steel components are basically the same. Chromium can be used when welding stainless steel wire, etc. H0Cr14 H1Cr13 H1Cr17, welding chrome-nickel stainless steel, wire, etc. can be used H0Cr19Ni9 H0Cr19Ni9Ti; welding low carbon stainless steel, low carbon should be the appropriate wire, such as H00Cr19Ni9 and so on. Flux can be fused or sintered, requiring the oxidation flux is smaller, to reduce the burning of alloying elements.