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What exactly is welding electrode

Dec 20, 2018

What exactly is welding electrode

     A welded metal strip that is filled at the joint of a welded workpiece during gas welding or electric welding. The material of the electrode is usually the same as the material of the workpiece.

      The electrode is a melted electrode coated with a coating for electrode arc welding, which is composed of a coating and a core. According to the national standard "welding steel wire" (GB 1300-77), the special steel wire used for welding can be divided into three types: carbon structural steel, alloy structural steel and stainless steel.

      The covered electrode is a uniform and centripetal coating of the coating (coating) on the core outside the metal core. 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 electrode consists of two parts: the core and the coating. The types are different and the cores are different. The composition of the core directly affects the composition and properties of the weld metal, so the harmful elements in the core should be as small as possible. Welded carbon steel and low alloy steel cores are generally made of low carbon steel as the core and added with manganese, silicon, chromium, nickel and other components (see wire national standard G1300-77 for details). The reason for using low carbon is that the steel wire has good plasticity when the carbon content is low, and the wire drawing is relatively easy. On the other hand, the CO content of the reducing gas can be reduced, the splash or pores can be reduced, and the temperature at which the weld metal is solidified can be increased. It is good for overhead welding. The addition of other alloying elements is mainly to ensure the comprehensive mechanical properties of the weld, and also has a certain effect on the welding process performance and the removal of impurities. High-alloy steel and other metal materials such as aluminum, copper, cast iron, etc., in addition to the requirements of the metal core of the weld metal, also control the content of impurities, and often add certain alloying elements according to the process requirements. The welding rod is a molten electrode for coating electrode arc welding, which is composed of two parts: a coating and a welding core. The chamfer at the front end of the electrode has a chamfer of about 45Ā°, which is for the purpose of arc ignition. There is a section of bare core at the end, which accounts for about 1/16 of the total length of the electrode, which facilitates the clamping of the welding tongs and facilitates electrical conduction. The diameter of the electrode actually refers to the diameter of the core. It is usually 2, 2.5, 3.2 or 3, 4, 5 or 6 mm. The most commonly used are small 3.2, small 4 and small 5, and the length is "L". "Generally between 200 and 550 mm.

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