The factors that affect the efficiency of the medium frequency spot welding machine include the following aspects: 1. Welding current factor; 2. Pressure factor; 3. Power-on time factor; 4. Current waveform factor; 5. Surface state factor of the material. Here is a detailed introduction for you:
1. Welding current factors
Because the heat generated by a resistor is proportional to the square of the current flowing through it, the welding current is an important factor in generating heat. The importance of welding current does not only refer to the size of the welding current, but the level of current density is also very important. ※Nugget: refers to the metal part that solidifies after melting at the joint during lap resistance welding.
2. Add stress factors
The pressure applied during the welding process of the medium frequency spot welder is an important factor in heat generation. Pressure is a mechanical force applied to the welding area. The pressure reduces the contact resistance and makes the resistance value uniform. It can prevent local heating during welding and make the welding effect uniform.
3. Power-on time factor
The power-on time is also an important factor in generating heat. The heat generated by power-on is first released through conduction. Even if the total heat is constant, because of the difference in power-on time, the temperature of the welding point is also different, and the welding results are also different.
4. Current waveform factors
The combination of heating and pressure in time is very important for medium frequency spot welding machines, so the temperature distribution at each moment during the welding process must be appropriate. Depending on the material and size of the object to be welded, a certain current will flow through it within a certain period of time. If the pressure is slowly applied to the heating of the contact part, it will cause local heating and worsen the welding effect of the spot welder. In addition, if the current stops suddenly, cracks and material embrittlement may occur due to sudden 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.
5. Material surface state factors
Contact resistance is directly related to the heating of the contact part. When the pressure is constant, the contact resistance determines the state of the surface of the welded object. That is, after the material is determined, the contact resistance depends on the fine unevenness and oxide film on the metal surface. Small unevenness is helpful to obtain the desired heating range of the contact resistance, but due to the existence of the oxide film, the resistance increases and local heating occurs, so it should still be removed.
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Post time: Jan-07-2024