Related components of welding rod

The welding rod consists of two parts: the welding core and the coating. The welding rod is a coating (coating) that is evenly and centripetally pressed onto the welding core outside the metal welding core. Different types of welding rods have different welding cores. The welding core is the metal core of the welding rod. 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 restricted and better than the parent material. The composition of the welding core directly affects the composition and performance of the weld metal, so the harmful elements in the welding core should be as small as possible.

For welding 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. The reason for using low carbon is that on the one hand, the steel wire has good plasticity when the carbon content is low, and the wire drawing is easier. On the other hand, it can reduce the content of reducing gas CO, reduce spatter or pores, and increase the temperature of the weld metal when solidifying, which is beneficial to 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 impurity removal.

For high-alloy steel and other metal materials such as aluminum, copper, and cast iron, the composition of the welding core is not only required to be similar to the metal to be welded, but also the content of impurities must be controlled, and certain specific alloying elements are often added according to the process requirements.

The welding rod is a melting electrode coated with a coating for arc welding. It consists of a coating and a welding core. The coating at the front end of the welding rod has a chamfer of about 45°, which is for the convenience of arc starting. There is a bare welding core at the tail, which accounts for about 1/16 of the total length of the welding rod, which is convenient for welding clamps to clamp and is conducive to conduction. The diameter of the welding rod actually refers to the diameter of the welding core, which is usually 2, 2.5, 3.2 or 3, 4, 5 or 6mm. The commonly used ones are small 3.2, small 4, and small 5. The length "L" is generally between 250^-450 mm.