Q. What is electrode coatings?

• Slag Forming Ingredients. Asbestos, mica, silica, fluorspar, titanium dioxide, iron oxide, magnesium carbonate, calcium carbonate and aluminum oxide.

• Arc Stabilizing Ingredients. Or ionizing agents: potassium silicate, TiO₂ + ZrO₂ (Rutile), Mica, Calcium oxide, sodium oxide, magnesium oxide, feldspar (KAlSi₃O₈).

The major types of feldspars are:-

o Potash feldspar, K₂O. Al₂O₃. 6SiO₂
o Sodium feldspar, Na₂O. Al₂O₃. 6SiO₂
o Lime feldspar, CaO. Al₂O₃. 6SiO₂

• ng Ingredients. Cellulose, calcium carbonate, dolo-mite, starch, dextrin, ur, graphite, aluminum, ferromanganese.

• Binding Materials. Sodium silicate, potassium silicate, asbestos.

• Alloying Constituents to Improve Strength of Weld.

• TiO2 and potassium compounds increase the melting rate of the base metal for better penetration.

• Iron powder provides higher deposition rate.