pH electrode according to the classification of slag
2011-08-25 by seoer
Mainly according to the Welding Electrodes slag basicity, ie acidic and alkaline oxide slag in the ratio of oxide to divide.
(1) acidic electrode
Skin contains large amounts of drugs TiO2, SiO2 and other acidic slag material and a certain amount of carbonate, a strong oxidizing slag, slag basicity coefficient is less than 1. Acid electrode welding, good arc stability, and can be AC ​​and DC, little spatter, slag and liquid slag off good, mostly glassy slag, loose, good performance off the slag, weld surface appearance. Electrode in acidic drug skin contains more silica, iron oxide and titanium dioxide, strong, weld metal oxygen content is high, burning more alloying elements, alloy transition coefficient is small, deposition higher hydrogen content in metals, which weld metal ductility and toughness lower.
(2) basic (low hydrogen) electrodes
Skin contains large amounts of drugs alkaline slag material (marble, fluorite, etc.), and contains a certain amount of deoxidizing agent and alloying agent penetration. Electrode depends mainly on the alkaline carbonate (such as CaCO3, etc.) for the decomposition of CO2 shielding gas, arc atmosphere of hydrogen partial pressure low, and calcium fluoride in fluorite at high temperature and hydrogen combine to form hydrogen fluoride (HF), reduce the amount of hydrogen in the weld, it is also known as basic low-hydrogen Copper Electrode. Determination of glycerol, each 100g of deposited metal diffusible hydrogen content of basic welding rod is 1 ~ 8mL, acidic electrode is 17 ~ 50mL. Basic quantity of CaO slag, slag desulfurization capacity, deposited metal thermal cracking ability. Moreover, basic welding because the weld metal oxygen and hydrogen content is low, less non-metallic inclusions with high plasticity and toughness. As the drug electrode in alkaline skin contains more fluorite, arc stability is poor, generally use DC reverse only when the drug skin contains higher amounts of steady arc agents, can pay, and DC. Basic electrode for welding is generally used for more important structures, such as dynamic load or rigid to withstand the larger structure.