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The main composition of the electrode
Mar 21, 2018

The electrode consists of two parts, the core and the sheath. The electrode is coated on the core by a uniform and centripetal coating (coating) outside the metal core. Different types of electrodes, welding cores are also different. 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, there are strict rules for the content of various metal elements in the welding core, especially for the content of harmful impurities (such as sulfur, phosphorus, etc.). The limit is better than the parent material. The composition of the core directly affects the composition and properties of the weld metal, so the harmful elements in the core must be kept to a minimum.

Welded carbon steel and low-alloy steel welding cores are generally made of low-carbon steel as the core, and filled with manganese, silicon, chromium, nickel and other components (see the wire national standard GB1300-77). The reason for using low carbon is on the one hand, when the carbon content is low, the plasticity of the steel wire is good, the drawing of the wire is relatively easy, on the other hand, the reducing gas CO content can be reduced, splashes or pores can be reduced, and the temperature of the solidification of the weld metal can be increased. Good for overhead welding. The addition of other alloying elements is mainly to ensure the overall mechanical properties of the weld seam, and also has a certain effect on the welding process performance and removal of impurities.

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