Precision spot welding machines can be determined by equations, heat resistance, and time. Therefore, in the welding process, this is a parameter that must be strictly controlled. The main reason is due to fluctuations in the voltage of the precision spot welding machine grid and changes in the current caused by impedance variations in the dual circuit of the AC welding machine. Impedance changes are due to changes in loop geometry or the use of different magnetic metals in dual circuits.
The current precision spot welding machine is not significantly affected by changes in the secondary circuit impedance. Welding time: In order to ensure the size of the block and the strength of the joint, the welding time and the welding current of the small spot welding machine can complement each other within a certain range. In order to achieve a certain intensity, high current and short circuit, there may also be a small current and long. The standard specifications for hardness or softness depend on the metal properties, thickness, welding power source, and selection. At present, there are upper and lower limits on the time required for metals of different properties and thicknesses.
The influence of surface conditions on precision spot welding machines: surface oxides, dirt, oil, and other impurities increase contact resistance. A thick oxide layer or even an electric current cannot pass through. If the local conduction current density is too high, splashing and surface combustion may occur. The presence of an oxide layer can also affect the uneven heating caused by each precision spot welding point, resulting in fluctuations in the welding quality of the precision spot welding machine. Therefore, thoroughly cleaning the surface of precision spot welding machines is necessary to ensure high-quality connectors.
Precision spot welding machine electrode pressure: The increase in electrode pressure between electrodes significantly reduces the total resistance, and the rate of increase in welding current is small, which does not affect the reduction in heat caused by the decrease. Therefore, the strength of the joint is always increasing during pressure welding. The solution is to increase the welding pressure of the precision spot welding machine and at the same time increase the welding current of the precision spot welding machine.
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