Electrodes: 1: points: A drug skin melted slag characteristics acid electrode. B alkaline electrode. 2: Press the The electrode uses (welding base metal) category: 1: structural steel welding rod (J): molybdenum and chromium molybdenum heat-resistant steel welding rod (R): low temperature steel electrodes (W) 4: stainless steel electrode (chromium stainless steel electrode) (G) and austenitic stainless steel electrode (A) : Surfacing Electrodes (D) 6: cast iron welding rod (Z): Nickel and nickel alloy welding rod (NI) 8: copper and copper alloy welding rod (T) 9: aluminum and aluminum alloy welding rod (L) 9: special purpose welding rod (TS).   Under normal circumstances, the process performance of the acid electrode, the mechanical properties of a single weld metal; while somewhat less alkaline electrode process performance, good mechanical properties of a single weld metal. Therefore, welding general structural parts, often acid electrode; when welding an important component, often using the alkaline electrode. Acid electrode the preferred acid electrode should meet the performance requirements than alkaline electrode economy.