The heat generated by the resistance of the precision battery spot welder welding current is proportional to the current fluctuation through the transistor power supply. Therefore, the battery spot welder welding current is the most important factor in generating heat. The importance of the battery welding current does not simply refer to the size of the welding current, but also the battery current density. Pressure during the welding process of the battery spot welder is an important factor in generating heat. Pressure is the mechanical force applied to the weld. By applying pressure to the welding battery, the contact resistance is reduced and the resistance value is uniform, which can prevent local heating during welding and make the welding effect uniform.
1. The power-on time of the battery spot welder is also an important factor in generating heat. The heat generated by the power-on is released through conduction. Even if the total heat is constant, the maximum temperature of the welding point is different due to different power-on times, and the welding results are also different.
2. The optimal combination of the current waveform heating and pressure in time of the welding battery is very important for the spot welder. For this reason, the temperature distribution at each moment in the welding process must be appropriate. According to the material and size of the welded object, a certain current is passed within a certain period of time. For the heating of the contact part of the battery spot welder, if the pressure is slow, it will cause local heating of the battery and deteriorate the welding effect of the spot welder. In addition, if the current stops suddenly, the weld will cool suddenly, resulting in cracks and embrittlement of the material. Therefore, the battery should be passed with a small current before or after the main current passes, or pulses should be added to the rising and falling currents. For example: thick plates and stamped products have deformation and strain. In order to make the plates tightly bonded after welding, a small current is passed before the main current for preheating. For materials that will produce thermal hardening or cracks, a small current is passed after the main current flows to achieve annealing.
3. The surface state of the battery material The contact resistance is a factor directly related to the heating of the contact part. When the applied pressure is constant, the contact resistance is determined by the surface state of the weld, that is, the material. After the contact resistance is determined, it depends on the fineness of the metal surface. Concave and convex and oxidized film. Fine concave and convex are conducive to obtaining the desired heating range of the contact resistance, but due to the presence of the oxidized film, the resistance of the battery spot welder increases, which will cause local heating, so it should still be removed.
The battery spot welder has a beautiful appearance and is controlled by a microcomputer, with keyboard settings and adjustments for various parameters. This power battery spot welder uses LCD display to set parameters, which is accurate and convenient. The microcomputer high-frequency inverter spot welder has small welding sparks, the welding point does not change color, the welding is more solid, the welding time is short, and the heat effect can be minimized. The impact on the intrinsic characteristics of the battery cell is small, and this spot welder is particularly adaptable to the power supply, and the welding pressure can be directly displayed. Compared with the traditional AC pulse and capacitor energy storage spot welder welding, the battery surface will be cleaner after welding; high-precision welding, more uniform heating; the welding pressure of the Gantry battery welding machine series spot welder is independently adjustable, and the welding is more reliable.
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