How can I distinguish the basic electrode or the acid welding electrode from the welding rod number?What are the basic electrode models?What are the types of acid electrodes?
General electrode brand will see E308-15 or -16 or -17,Suffix 15 means that the electrode is alkaline, and the reverse polarity is welded;Suffix 16 means that the electrode can be an alkaline coating, or a titanium or a calcium titanium based coating for both hand and dc;The suffix 17 is a variant of the drug skin type 16, which means that the electrode is made of titanic acid type and can be used for both hand and DC purposes.The ingredients and operation characteristics of the rings 25 and 26 are similar to those of the electrode type 15 and 16. The specifications of the type 15 and 16 of the electrode type are also suitable for the type 25 and 26 of the coating types. According to the nature of the electrode coating, the electrode can be divided into two categories: acid electrode and basic electrode.Drug skin contains a large amount of acidic oxide (TiO2, SiO2, etc.) electrode, known as the "acid electrode.".The skin contains many basic oxides (CaO, Na2O, etc.) called alkaline electrode.Acid electrode can AC-DC, the welding process performance is better, but the weld mechanical properties, especially the impact toughness is poor, suitable for welding low alloy steel for low carbon steel and low strength, is the most widely used electrode.The basic electrode has strong desulfurization and dephosphorization ability, and the coating has the function of hydrogen removal. The hydrogen content of welding joint is very low, so it is also called low hydrogen type welding rod. Basic welding seam has good crack resistance and mechanical properties, but poor technology performance, general DC power supply welding, mainly used for important structures (such as boiler, pressure vessel and alloy steel welding etc.).
The number of electrodes from 0 to 6 is acidic, and 7 to 9 is alkaline
