Medium frequency spot welding machine voltage control technology
The medium frequency spot welding machine voltage control technology selects certain characteristic parameters on the inter-electrode voltage curve as control objects during the solder joint formation process, and controls the nugget size of the solder joint by controlling these parameters. During the spot welding process, the metal undergoes the evolution of melting and solidification, the conductivity and conductive area of the welding zone change according to certain rules, and the voltage between the electrodes also changes accordingly.
The area of the current channel increases rapidly. As the metal melts, on the one hand, the resistance will increase, on the other hand, the area of the current channel will increase, the impedance will decrease, and the channel area will expand very quickly, thus forming a descending curve of AB when the nugget grows to a certain extent. If it grows too fast, splashing will occur and the voltage will drop sharply. On the voltage curve, the characteristic parameters that can express the length of the nugget are: voltage value (V), voltage difference (V=V-V), voltage change rate (AVN.), and the area surrounded by the voltage curve (V).
It decreases as the electrode pressure increases and moves to the right. When the welding current is large and the electrode pressure is small, a large AV value can be obtained. This rule is consistent with the change rule of nugget size. This shows that when using voltage control, the selection of the predetermined V should take into account the strength of the welding specification and be determined through repeated trials.
Quality monitoring techniques such as voltage change rate and voltage integration method were once used in production. Under the condition that the electrode pressure is not very large, the voltage monitoring technology has high sensitivity and small dispersion to changes in welding current and edge distance. However, in situations where the current shunt is affected by the small point distance, the monitoring effect is not ideal. .
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