According to different situations, there are three classification methods for welding electrodes: classification according to the purpose of welding rods, classification according to the main chemical components of the coatings, and classification according to the characteristics of the molten slag after melting of the coatings.
According to the use of the welding rod, there are two forms of expression. One is compiled by the former Ministry of Machinery Industry. The welding electrode can be divided into: structural steel welding rod, heat-resistant steel welding rod, stainless steel welding rod, surfacing welding rod, low-temperature steel welding rod, cast iron welding rod. , nickel and nickel alloy electrodes, copper and copper alloy electrodes, aluminum and aluminum alloy electrodes and special purpose electrodes. The second is the national standard, which is carbon steel electrode, low alloy electrode, stainless steel electrode, surfacing electrode, cast iron electrode, copper and copper alloy electrode, aluminum and aluminum alloy electrode. There is no principle difference between the two. The former is indicated by a commercial grade and the latter by a model.
If classified according to the main chemical composition of the electrode strip, the electrode can be divided into: titanium oxide electrode, titanium oxide calcium electrode, ilmenite electrode, iron oxide electrode, cellulose electrode, low hydrogen electrode , graphite type electrode and salt-based electrode.
If the characteristics of the slag are classified according to the characteristics of the slag after melting, the electrode can be divided into an acid electrode and a basic electrode. The main component of the acid electrode coating is an acidic oxide such as silica, titania, or ferric oxide. The main component of the alkaline electrode coating is an alkaline oxide such as marble or fluorite.
There are many classification methods for welding electrodes, and the welding electrodes can be classified according to the application, the alkalinity of the slag, the main components of the electrode coating, and the performance characteristics of the welding rod. Classified by purpose
China's current welding rod classification method is mainly based on the national standard of welding rods and the "welding material samples" compiled by the former Ministry of Machinery Industry. The welding rod models are divided into 8 categories according to national standards, and the welding rod grades are divided into 10 categories according to their purposes.
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