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Welding core introduction
Mar 21, 2018

The metal core covered by the coating in the electrode is called the core. The core is generally a wire with a certain length and diameter. When welding, the welding core has two functions: one is to conduct the welding current, and the arc is generated to convert the electrical energy into heat energy; the second is that the core itself is melted as the filler metal and the liquid base metal melt to form a weld seam.

When the electrode is welded, the core metal is part of the entire weld metal. Therefore, the chemical composition of the core directly affects the quality of the weld. Therefore, the steel wire used as the core of the welding rod is individually stipulated with its grade and composition. If used for submerged arc welding, electroslag welding, gas shielded welding, gas welding and other welding methods as filler metal, it is called welding wire.

The electrode coating is the coating layer applied on the surface of the core. The resin skin decomposes and melts in the welding process to form gas and slag, which plays a role in mechanical protection, metallurgical treatment, and improvement of process performance. The composition of the medicinal coating includes: minerals (such as marble and fluorite), iron alloys and metal powders (such as ferromanganese and titanium iron), organic substances (such as wood flour and starch), and chemical products (such as titanium White powder, water glass, etc.).

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