Welding slag basicity, that is divided in proportion to the alkaline oxides in the slag and acidic oxides.
(1) acid electrode
Drug skin contains a lot of acid such as TiO2, SiO2 slag material and a certain amount of carbonate slag strong oxidizing slag basicity coefficient is less than 1. Acid electrode Welding Wires, arc stability, can be AC, DC, small splash, slag fluidity and off the slag, the slag mostly glassy, ??loose and off the residue of good performance, the appearance of the weld appearance. Acidic electrode coating contains more silica, iron oxide and titanium dioxide, strong oxidation, the higher oxygen content in the weld metal alloying elements burning more, smaller coefficient of alloy transition, deposition metal hydrogen content is also higher, thus the lower the ductility and toughness of the weld metal.
(2) basic (low hydrogen type) electrode
Drug skin contains large amounts of alkaline slag material (marble, fluorite, etc.), and contains a certain amount of deoxidizer and alloying agent. Alkaline electrode depends mainly on the carbonate decomposition of CO2 Gas Shielded Welding Wire, the arc column, an atmosphere of hydrogen partial pressure lower, and calcium fluoride in fluorite at high temperatures and hydrogen combine to form hydrogen fluoride (HF), reduce the amount of hydrogen in the weld, so the alkaline electrode is also known as a low hydrogen type electrode. Measured by glycerol per 100g diffusible hydrogen content in the deposited metal, alkaline electrode 8mL, acid electrode 17 ~ 50mL. CaO in the number of basic slag, slag desulfurization capacity, and the deposited metal thermal crack ability. Moreover, the alkaline electrode due to the low content of oxygen and hydrogen in the weld metal, non-metallic inclusions less, with high ductility and impact toughness. Alkaline electrode due to the drug skin contain more fluorite, arc stability, the general use of the DCRP, only when the drug skin contains higher amounts of stable arc agent, AC and DC dual-use. Alkaline electrodes are generally used for welded structures, such as to withstand the dynamic load or rigid structure. Universal electrode.