In the electrode coating, if contains acid oxide (such as titanium oxide, silica sand) based coating composition, the electrode is called acid electrode, such as ilmenite type electrode, titanium calcium type electrode, titanium dioxide type electrode, iron oxide type electrode and cellulose type electrode.If a coating component is composed mainly of a basic oxide (such as calcium oxide), the electrode is called an alkaline electrode, such as a low hydrogen electrode consisting mainly of carbonate and fluorite.
The following is the comparison of acid electrode and alkaline electrode:
Acid electrode characteristics
1. Strong oxidation of drug skin components
2, the sensitivity of water, rust pores is not large, the electrode in the use of 75 ~ 150℃ baking 1h
3, stable arc, can be used for AC or DC welding
4. Large welding current
5, should be long arc operation
6. Poor transition effect of alloying elements
7. Good weld forming and shallow melting depth
8. The slag structure is glassy
9. Deslag is more convenient
10, weld, low temperature impact performance is general
11, crack resistance is poor
12. High hydrogen content in the weld is easy to produce "white spot", which affects plasticity
Characteristics of alkaline electrode
1. Weak oxidability of drug skin components
2, the sensitivity of water, rust porosity is large, the electrode in the use of 350 ~ 400℃ baking 1 ~ 2h
3, because the coating contains fluoride, deterioration of arc stability, must be used for DC welding.Ac and DC can be used only when arc stabilizer is added to the drug skin.
4. The welding current is small, about 10% smaller than the acid welding treaty of the same specification
5, should be short arc operation, otherwise easy to cause air hole
6. Good transition effect of alloying elements
7, the weld forming is good, easy to pile high, deep melting slightly deep
8. The slag structure is crystallized
9. Deslagging of the first layer in the groove is more difficult, and deslagging of subsequent layers is easier
10, weld normal, low temperature impact performance is high
2021-07-30 
