18 Jun,2024
Tip：Resistance welding method
This is a type of welding method that uses resistance heat as energy, including electroslag welding using slag resistance heat as energy and resistance welding using solid resistance heat as energy. Since electroslag welding has more unique characteristics, it will be introduced later. Here we mainly introduce several types of resistance welding using solid resistance heat as energy, mainly spot welding, seam welding, projection welding and butt welding.
Resistance welding is generally a welding method that makes the workpiece under a certain electrode pressure and uses the resistance heat generated when the current passes through the workpiece to melt the contact surface between the two workpieces to achieve connection. Usually a larger current is used.
In order to prevent arcing on the contact surface and to forge the weld metal, pressure must be applied during the welding process. When performing this type of resistance welding, the surface quality of the workpiece to be welded is of paramount importance for obtaining stable welding quality. Therefore, the contact surface between the electrode and the workpiece and between the workpieces must be cleaned before welding.
The contradiction between spot welding, seam welding and projection welding is that the welding current (single phase) is large (several thousand to tens of thousands of amperes), the power-on time is short (several cycles to several seconds), the equipment is expensive and complex, and the productivity is high, so it is suitable for mass production. It is mainly used for welding thin plate components with a thickness of less than 3mm. It can weld all kinds of steel, aluminum, magnesium and other non-ferrous metals and their alloys, stainless steel, etc.
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