Spot welding machine, also known as resistance welding machine, is the principle of welding using the resistance heat generated by the current passing through the welding point of the workpiece.
When working, two electrodes apply pressure to the workpiece, causing a certain contact resistance between the two layers of metal under the pressure of the two electrodes. When the welding current flows from one electrode to the other electrode, an instant thermal fusion is formed at the two contact resistance points, and the welding current instantly flows from the other electrode along the two workpieces to this electrode, forming a circuit without damaging the internal structure of the welded workpiece.
The process of spot welding involves cleaning the surface of the welded component and placing it between the upper and lower electrodes, applying pressure to ensure good contact; Electricity is applied to heat the contact surface of two workpieces, causing local melting and forming a melt nucleus; Maintain pressure after power outage to allow the molten core to cool and solidify under pressure, forming solder joints; Remove the pressure and take out the workpiece.
Welding process parameters such as welding current, electrode pressure, energization time, and electrode working surface size have a significant impact on welding quality.
The process of spot welding involves opening the cooling water; Clean the surface of the welded component, assemble it accurately, and place it between the upper and lower electrodes, applying pressure to ensure good contact; Electricity is applied to heat the contact surface of two workpieces, causing local melting and forming a melt nucleus; Maintain pressure after power outage to allow the molten core to cool and solidify under pressure; Form solder joints; Remove the pressure and take out the workpiece.
Preparation and installation of welding parts: Before welding steel welding parts, all dirt, oil stains, oxide scales, and rust must be removed. For hot-rolled steel, it is best to first acid wash, sandblasting, or use a grinding wheel to remove the oxide scale at the welding point. Although uncleaned welded parts can be spot welded, it seriously reduces the service life of the electrode, and together reduces the production power and quality of spot welding. Low and medium carbon steel with thin coating can be directly welded.
In addition, users can refer to the following process data when using:
1. Welding time: When welding medium and low carbon steel, this welding machine can use strong gauge welding method (instantaneous power on) or weak gauge welding method (long-term power on). Strong standard welding method should be adopted in mass production, which can improve production efficiency, reduce electricity consumption, and alleviate workpiece deformation.
2. Welding current: The welding current is determined by the size, thickness, and contact surface condition of the welded component. Usually, the higher the conductivity of the metal, the greater the electrode pressure, and the shorter the welding time. At this point, the required current density also increases accordingly.
3. Electrode pressure: The purpose of applying pressure to the welded joint by the electrode is to reduce the contact resistance at the welding point and ensure the required pressure for the formation of the welding point.
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