Electrode welding core and coating by the two parts. Metal welding electrodes in the outer core of the coating ( coating ) uniform pressure applied to carefully solder core. Welding rodDifferent types, welding core is different. Welding electrode core metal core , as Guarantee the quality and performance of the weld , butt in the core content of the metal elements have strict rules, especially harmful impurities ( such as sulfur, phosphorustc. ) content, should be strictly limited, than the base metal . Welding core into Of a direct impact on the composition and properties of the weld metal , Stainless Steel Electrode so the welding core harmful elements as little as possible . Welding carbon steel and low alloy steel welding core , are generally used as a low-carbon steel core wire and fill plus manganese, silicon , chromium, nickel and other ingredients ( see wire StatesHome standard GB1300 -77 ) . For one, using a low-carbon containing Low carbon steel plastic, wire drawing is easier , on the other hand reduce the CO content in the reducing gas , reducing splashing or pores, andIncreased weld metalsolidification temperature favorable for overhead welding . Join itsHis main alloying elements in order to ensure the comprehensive mechanical properties of the weld , while the welding performance and remove impurities, also have a role . High alloy steel as well as aluminum , copper, iron and other metal materials, welded to the core component in addition to the metal to be welded with similar requirements , the same also control the impurityContent , according to process requirements often adding certain alloying elementsElectrode is coated with a drug skin used for SMAW consumable electrode , it is by coating and welding core composed of two parts . In front electrode coatingThere are about 45 ° chamfer , which is to facilitate the arc . In the taiA bare core wire , rod length of about 1/16 , to facilitate welding clamp holding and contribute to conductivity . Diameter of the wire Chung actually refers welding core diameter ) throughOften for 2,2 . 5,3 . 2 or 4, 5 or 6mm , such as several specifications, Used is a small 3.2 , four small , a small 5 three, the length "L" in general between 250 ^ -450 mm .