Welding electrode
The electrode consists of two parts: the core and the coating. The electrode is coated on the core uniformly and centripetally with the coating (coating) outside the metal core. The welding rods are different depending on the type of electrode. The core of the welding rod is the metal core of the welding rod. In order to ensure the quality and performance of the welding seam, the content of each metal element in the welding core is strictly regulated, especially for the content of harmful impurities (such as sulfur, phosphorus, etc.). The limit is better than the base metal. The metal core covered by the coating in the electrode is called a core. The core is generally a Steel Wire of a certain length and diameter. When welding, the core has two functions: one is to conduct welding current, the arc is used to convert electrical energy into heat, and the other is that the core itself is melted as a filler metal to fuse with the liquid base metal to form a weld.
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.
The electrode used in manual arc welding consists of two parts: the coating and the core. When welding, the electrode acts as an electrode, on the one hand, to conduct current and ignite arc, so that a continuous and stable arc is generated between the electrode and the base metal to provide the heat necessary for the fusion welding. On the other hand, the electrode is added as a filler metal to the weld and becomes the main component of the weld metal. Therefore, the composition of the electrode and the quality of the electrode will directly affect the chemical composition, mechanical properties and physical properties of the weld metal. In addition, the electrode has a great influence on the stability of the welding process, the appearance quality of the weld, and the welding productivity.
The core is the metal core of the electrode. In order to ensure the quality of the weld, there are strict regulations on the content of various metal elements in the core. In particular, there are strict restrictions on harmful impurities (such as sulfur, phosphorus, etc.), and the quality of the core metal should be superior to that of the base metal.
A polished rod electrode without a coating is not capable of arc welding. This is because the arc is very poorly stable, the splash is large, and the weld is not well formed. After long-term practice, it was gradually found that some mineral materials (ie, electrode strips) were coated on the outside of the core, and the performance of the electrode was greatly improved.
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