The coating applied to the surface of the core is called a coating. The coating of the electrode plays an extremely important role in the welding process. If the welding rod is welded with no coating, in the welding process, oxygen and nitrogen in the air will invade the molten metal in a large amount, and the metal iron and the beneficial elements carbon, silicon, manganese, etc. are oxidized and nitrided to form various oxides and Nitride, which remains in the weld, causing weld slag or cracks. The gas melted into the molten pool may cause a large number of pores in the weld, which can greatly reduce the mechanical properties (strength, impact value, etc.) of the weld and make the weld brittle. In addition, welding with a light-welding rod, the arc is very unstable, the splash is severe, and the weld is poorly formed.
In practice, it has been found that if a coating made of various minerals or the like is applied on the outside of the light-welding rod, the arc combustion can be stabilized and the quality of the weld be improved. This type of welding rod is called a coating electrode. With the continuous development of industrial technology, people have created high-quality thick coating electrodes that are widely used nowadays.
Welding rod type classification
(1) Type of coating: Titanium type medicinal material Main component: titanium oxide ≥ 35% ‖ Welding power source: DC or AC
(2) Type of drug skin: titanium calcium type cockroach skin main component: more than 30% of titanium oxide, less than 20% of carbonate ‖ welding power: DC or AC
(3) Type of coating: ilmenite type cockroach cockroach main ingredient: ilmenite ≥ 30% ‖ welding power source: DC or AC
(4) Type of coating: iron oxide type cockroach skin main ingredient: a large amount of iron oxide and more manganese iron deoxidizer ‖ welding power: DC or AC (5) coating type: high cellulose sodium type cockroach skin Ingredients: Organic matter 15% or more, titanium oxide 30% or so ‖ Welding power source: DC (6) Skin type: High cellulose potassium type cockroach skin Main components: Organic matter 15% or more, titanium oxide 30% ‖ Welding power: DC Or exchange (7) type of drug skin: low hydrogen sodium type cockroach skin main ingredients: calcium, magnesium carbonate and fluorite ‖ welding power supply: DC
(8) Type of coating: Low-hydrogen potassium type cockroach skin Main ingredients: Calcium, magnesium carbonate and fluorite ‖ welding power source: DC or AC
(9) Type of coating: iron powder, low hydrogen type, medicinal skin, main components: calcium, magnesium carbonate, fluorite and iron powder, welding power source: direct current or alternating current (10) coating type: graphite type medicinal skin Composition: A large amount of graphite crucible Welding power: DC or AC
(11) Type of drug skin: salt-based cockroach skin Main components: chloride and fluoride ‖ welding power source: DC
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