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Introduction of welding rod

Release Time:

2021-09-15

The electrode (covered electrode) is to apply the coating (coating) evenly and centripetally on the welding core outside the metal welding core. The welding core is the metal core of the electrode. In order to ensure the quality and performance of the weld, there are strict regulations on the content of each metal element in the welding core, especially the content of harmful impurities (such as sulfur, phosphorus, etc.), which should be strictly The limit is better than that of the base metal. The electrode is composed of two parts: the welding core and the coating. Different types have different solder cores. The composition of the weld core directly affects the composition and properties of the weld metal, so the harmful elements in the weld core should be as few as possible. For the welding core of carbon steel and low alloy steel, low carbon steel is generally used as the welding core, and manganese, silicon, chromium, nickel and other components are added (see the national standard for welding wire G1300-77 for details). The reason for using low carbon is that, on the one hand, when the carbon content is low, the plasticity of the steel wire is good, and the wire drawing is easier; 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 removal of impurities. For high alloy steel and other metal materials such as aluminum, copper and cast iron, in addition to the requirements of the welding core composition to be similar to that of the metal to be welded, the content of impurities should also be controlled, and some specific alloying elements are often added according to process requirements. The electrode is a melting electrode coated with a coating for electrode arc welding. It is composed of a coating and a welding core. The coating at the front end of the electrode has a chamfer of about 45°, which is to facilitate arc striking. There is a section of bare welding core at the tail, which accounts for about 1/16 of the total length of the electrode, which is convenient for the welding tongs to hold and conduct electricity. The diameter of the electrode actually refers to the diameter of the welding core) is usually 2, 2.5, 3.2 or 3, 4, 5 or 6mm and other specifications, the most commonly used are small 3.2, small 4, small 5, its length "L" "Generally between 200 and 550 mm.

The composition of the weld core directly affects the composition and properties of the weld metal, so the harmful elements in the weld core should be as few as possible. For the welding core of carbon steel and low alloy steel, low carbon steel is generally used as the welding core, and manganese, silicon, chromium, nickel and other components are added (see the national standard for welding wire G1300-77 for details). The reason for using low carbon is that, on the one hand, when the carbon content is low, the plasticity of the steel wire is good, and the wire drawing is easier; 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 removal of impurities. For high alloy steel and other metal materials such as aluminum, copper and cast iron, in addition to the requirements of the welding core composition to be similar to that of the metal to be welded, the content of impurities should also be controlled, and some specific alloying elements are often added according to process requirements.

The electrode is a melting electrode coated with a coating for electrode arc welding. It is composed of a coating and a welding core. The coating at the front end of the electrode has a chamfer of about 45°, which is to facilitate arc striking. There is a section of bare welding core at the tail, which accounts for about 1/16 of the total length of the electrode, which is convenient for the welding tongs to hold and conduct electricity. The diameter of the electrode actually refers to the diameter of the welding core) is usually 2, 2.5, 3.2 or 3, 4, 5 or 6mm and other specifications, the most commonly used are small 3.2, small 4, small 5, its length "L" "Generally between 200 and 550 mm.