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What Is The Difference Between The Use Of Precision Spot Welder And Ordinary?
Nov 16, 2018

Small precision spot welding machine 2. The choice of series of current regulating switches can be selected according to the thickness and material of weldments. The power indicator lamp should be turned on after electrification. The electrode pressure can be adjusted by the spring pressure nut to change its compression degree. 3. After the above adjustment is completed, the cooling water can be first connected to the power source and ready for welding. Welding procedure: the welding piece is placed between the two electrodes, the foot pedal is depressed, and the upper electrode is contacted with the welding piece and pressurized. When the foot pedal is continued to be depressed, the power contact switch is turned on, so the transformer starts to work and the secondary circuit is electrified to heat the welding piece. When the foot pedal is loosened after a certain time of welding, the electrode rises. By the pull of spring, the power supply is cut off first and then restored to its original state. The single spot welding process is finished. 4. Welding preparation and assembly: Before welding, all dirt, oil stain, oxide scale and rust must be removed. For hot rolled steel, it is best to remove oxide scale by pickling, sandblasting or grinding wheel. Uncleaned weldments can be spot-welded, but they seriously reduce the service life of electrodes and the production efficiency and quality of spot welding. For medium and low carbon steel with thin coating, it can be directly welded. In addition, users can refer to the following process data when using: (1) welding time: when welding medium and low carbon steel, the welding machine can use strong specification welding method (instantaneous power-on) or weak specification welding method (long time power-on). In order to ensure nugget size and weld strength, welding time and welding current can complement each other in a certain range. In order to obtain a certain strength of solder joints, high current and short time (strong condition, also known as hard specification) can be used, but also small current and long time (weak condition, also known as soft specification). The selection of hard or soft specifications depends on the performance and thickness of the metal and the power of the welder. There is a upper and lower limit for the current and time required for metals with different properties and thickness, which shall prevail when used. The total resistance R between the two electrodes is obviously affected by the electrode pressure. With the increase of the electrode pressure, R decreases significantly, but the increase of welding current is not significant, which can not affect the heat production reduction caused by the decrease of R. Therefore, the strength of solder joints decreases with the increase of welding pressure. The solution is to increase the welding pressure while increasing the welding current. Because the contact area of the electrode determines the current density, the resistivity and thermal conductivity of the electrode material are related to the generation and loss of heat, therefore, the shape and material of the electrode have a significant impact on the formation of the nugget. With the deformation and wear of electrode ends and the increase of contact area, the strength of solder joints will be reduced.