The electrode consists of two parts: the core and the coating. The electrode is coated on the core uniformly and centripetally with the coating (coating) outside the metal core. The welding rods are different depending on the type of electrode. 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 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 selected from low carbon steel as the core, and filled with manganese, silicon, chromium, nickel and other components (see wire national standard GB1300-77 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 45°, 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 is actually the diameter of the core. It is usually 2, 2. 5, 3. 2 or 3, 4, 5 or 6 mm. It is commonly used as small 3. 2, small 4, small 5 The length "L" is generally between 250^-450 mm.

Tape measures

Tape measure is a common measuring tool in daily life, and it is one of the necessary tools for families. Lu Ban ruler, Feng Shui ruler and Wen Gong ruler also belong to steel tape. Steel tape is a common tool in construction and decoration.

Steel tape can be divided into self winding tape, braking tape and rolling tape. Other names of steel tape are: steel tape, steel box ruler.

The second is the fiber tape measure, which is the tape measure that we often see. Many people say it's the cloth measure. The waist measure and the tailor measure all belong to this category. In the south of China and Hong Kong, it is often called tape measure or slide rule. Its material is PVC plastic and glass fiber, glass fiber can prevent the tape from being elongated in the process of using. Gift ruler is used for advertising and promotion. It is divided into steel tape (steel strip) and leather tape (PVC plastic fiber tape). It is usually cute and small.

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