The current required for spot welding machines to process metals of different functions and thicknesses
There is an upper limit to the current and time required for spot welding machines to process metals of different functions and thicknesses. The electrode pressure of a spot welding machine has a significant impact on the total resistance R between two electrodes. As the electrode pressure increases, R decreases significantly, but the increase in welding current is not significant and cannot affect the decrease in heat generation caused by the decrease in R. Therefore, the strength of the solder joint always decreases with the increase of welding pressure. In order to ensure the length and width of the fusion zone and the strength of the solder joint, the influence of the welding light on the frpp tube can complement each other within a certain range. In order to obtain a certain strength of solder joints, high current and short duration (strong premise, also known as hard standard) can be used, or low current and long duration (weak premise, also known as soft standard) can be used. The choice between hard and soft standards depends on the functionality, thickness, and power of the welding machine used for the metal.
The solution is to increase the welding current while increasing the welding pressure. Due to the fact that the contact area of the electrode determines the current density, the electrical resistivity and thermal conductivity of the electrode material are related to the generation and loss of heat, and the shape and material of the electrode have a significant impact on the formation of fusion nuclei. As the electrode tip deforms and wears, the contact area increases, and the strength of the solder joint decreases the impact of electrode pressure. The electrode pressure has a significant impact on the total resistance R between two electrodes. As the electrode pressure increases, R decreases significantly, but the increase in welding current is not significant and cannot affect the decrease in heat generation caused by the decrease in R.
The weld strength of a spot welding machine always decreases with the increase of welding pressure. The solution is to increase the welding current while increasing the welding pressure. The influence of electrode shape and data function is determined by the electrode's war area, which determines the current density. The electrical resistivity and thermal conductivity of electrode data are related to the generation and dissipation of heat. Therefore, the shape and data of the electrode have a significant impact on the composition of the melt nucleus. With the deformation and wear of the electrode tip, the war area increases and the strength of the solder joint decreases. The influence of the external state of the workpiece, including oxides, dirt, oil, and other impurities, increases the resistance to war. An excessively thick oxide layer can even prevent current from passing through the process. Partially conductive, the spot welding machine may splash and burn externally due to excessive current density.
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