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What Specific Requirements Do The Electrodes Of Spot Welding Machine Have?
Sep 07, 2018

The basic requirements of spot welder electrodes weld metal should have good mechanical properties or other physical properties, such as structural steel electrodes require weld metal should have specified tensile strength and other mechanical properties, stainless steel, heat-resistant steel electrodes not only require weld metal should have specified tensile strength and other mechanical properties, but also should have corrosion resistance. Physical properties such as corrosion and heat resistance. The deposited metal of the electrode should have prescribed chemical composition to ensure its performance. The electrode should have good welding process performance, such as stable arc, small spatter, good slag removal, good weld formation, high productivity, low dust and other properties. The electrode should be well resistant to porosity and crack resistance. The welding rod should have good appearance quality, smooth and even skin coating around the welding core. The metal core covered by the coating is called the welding core. The core is usually a steel wire with a certain length and diameter. In welding, the welding core has two functions: one is conducting welding current, generating arc to convert electrical energy into heat energy; the other is the welding core itself melting as filler metal and liquid base metal to form a weld. When the electrode is welded, the core metal takes up part of the whole weld metal. Therefore, the chemical composition of the core directly affects the quality of the weld. Therefore, the steel wire used as the welding rod of the welding rod separately stipulates its brand and composition. If used in submerged arc welding, electroslag welding, gas shielded welding, gas welding and other welding methods for filler metal, it is called welding wire.
The way in which the same or different metals are heated or preloaded to achieve metal bonding is called welding. Correct welding procedure for high performance and stable welding materials of machine welding equipment and good welding environment for standardized operation ring are established according to welding test and welding procedure evaluation before welding. The welding procedure is the regulation and an important factor to ensure welding quality. Before welding, the surface treatment of base metal is necessary. Answer: If the base metal surface is not treated before welding, the oxides on the base metal surface will bring harm and hidden danger to the welded joint. The melting coefficient of welding wire refers to the melting amount of welding wire passing through the unit current per unit time. (g/Ah) the thinner the welding wire is, the greater the melting coefficient is, and the higher the efficiency. A general term for speed, line energy, etc. When welding current is welded, the current flowing through the welding loop is usually indicated by ampere (A). The voltage drop between the two ends of the arc voltage arc (two electrodes) is usually expressed by volt (V). The length of welding seam in the unit time of welding speed is usually expressed in centimeter / minute (cm/min). The distance between the end of the welding wire and the end of the conductive nozzle when the length of the welding is extended. When welding wire energy is fused, the energy input from the welding heat source to the weld of unit length is also called heat input. Joule / cm (J/cm) is generally used. The fusion ratio of weld metal is higher than that of weld metal when molten metal is melted. The ratio of the weld width to the weld thickness on the cross section of the single pass weld.  In the left-hand welding process, the welding torch moves to the left side by the right end of the weldment seam. The gas protection effect is good and the weld shape is beautiful. CO2 and TIG welding should be carried out by MIG welding with left direction welding. In the right direction welding method, the welding torch moves to the right side by the left end of the weldment seam. The metal used to weld the base metal is called the base metal. The weld metal is a part of the metal formed by solidification of the melted base metal and the filler metal (welding wire, electrode, etc.). Welded joint is a weak link in welded structure. Answer: Because of the inhomogeneity of the microstructure and properties of the welded joint, there are often some welding defects and high tensile residual stress, so the welded joint is the weak link in the welded structure. It is said that high-quality welding joints can be obtained through technological process. Answer: To improve the quality of welded joints, we can start from the following ways: selecting welding materials correctly, adopting reasonable welding technology, controlling fusion ratio, adjusting welding thermal cycle characteristics, using reasonable operation methods and groove design, supplemented by preheating, interlaminar insulation, slow cooling and post-heating, or heat treatment after welding. High quality welding joints can be obtained.