●Welding current

  Since the heat generated by the resistance is proportional to the square of the current passed, the welding current is the most important factor in generating heat. The importance of welding current does not simply refer to the size of the welding current, the current density is also very important.

※Nugget: refers to the metal part that solidifies after the melting of the joint during lap resistance welding.

● Pressure

   The pressure applied during the welding process of the spot welder is an important factor for heat generation. Pressure is the mechanical force applied to the welding place. The pressure can reduce the contact resistance and make the resistance value uniform, which can prevent local heating during welding and make the welding effect uniform.

● Power-on time

   The energization time is also an important factor in the generation of heat. The heat generated by the energization is released by conduction. Even if the total heat is constant, the maximum temperature of the welding place will be different due to the difference of the energization time, and the welding result will be different.

● Current waveform

   The best combination of heat and pressure in time is very important for spot welding machines. For this reason, the temperature distribution at each moment of the welding process must be appropriate. According to the material and size of the object to be welded, a certain current flows for a certain period of time. For the heating of the contact part, if the pressure is slow, it will cause local heating and deteriorate the welding effect of the spot welder. In addition, if the current is stopped abruptly, cracks and material embrittlement will occur due to rapid cooling of the welded part. Therefore, a small current should be passed before or after the main current passes, or pulses should be added to the rising and falling currents.

● Surface condition of the material

   Contact resistance is a factor directly related to the heating of the contact part. When the pressure is constant, the contact resistance is determined by the surface state of the solder, that is, after the material is determined, the contact resistance depends on the fineness of the metal surface

Bump and oxide film. The fine unevenness is beneficial to obtain the desired heating range of the contact resistance, but due to the existence of the oxide film, the resistance increases, which will cause local heating, so it should be removed.

The automatic series spot welding machine is beautiful in appearance, adopts microcomputer control, and sets and adjusts the keyboard of various parameters. This battery spot welding machine adopts LCD to display the setting parameters, which is accurate and convenient. The microcomputer high frequency inverter spot welding machine has very small welding sparks, the welding spot does not change color, the welding is firmer, and the welding time is short, which can minimize the thermal impact and have a small impact on the internal characteristics of the battery. The adaptability of the power supply is particularly strong, and the welding pressure can be directly displayed. Compared with the traditional AC pulse and capacitor storage welding machine, the surface of the battery after welding will be cleaner; high-precision welding, more uniform heating; The welding machine has the function of workpiece counting, and the number of weldments is displayed on the LCD screen in real time, which is convenient and quick to check, and the range of welding parameter setting will be wider.