What is the use of the constant current monitor of the medium frequency spot welding machine?

What is the use of medium frequency spot welding machine current monitor? The constant current monitor uses a microcomputer processor, so it can calculate the effective value of the welding current and accurately control the thyristor control angle. The accuracy of the constant current control can reach 2%. The constant current monitor only controls the welding current parameters and is related to the current setting. The value remains consistent.

The current setting value should be selected after multiple process tests based on the product structure, material characteristics and production conditions, and matched with the welding time, electrode voltage and electrode diameter. The characteristics of constant current control are: in the fluctuation of power supply voltage and welding machine When the loop impedance changes, the welding current can be controlled by the output to stabilize the nugget size of the solder joint.

Adaptability of constant current to supply voltage. When the power supply voltage changes between 300 and 450V, the galvanostat can maintain the welding current unchanged and ensure that the size of the welding nugget remains basically unchanged. If there is no constant current control, the welding current will increase as the voltage increases, and the nugget size will change greatly. It is the adaptability of the welding current to changes in the number of workpiece layers and the welding machine loop impedance. It shows that under constant current control, the welding current does not change with the change of load impedance.

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