Projection welding process parameters of medium frequency spot welding machine
The projection welding function of the medium frequency spot welding machine mainly relies on the projection welding process. The perfect projection welding process can achieve perfect welding. The main process parameters are: electrode pressure, welding time and welding current.
1. Electrode pressure
The electrode pressure of projection welding depends on the properties of the metal to be welded, the size of the bumps and the number of bumps welded at one time, etc. The electrode pressure is enough to completely depress the bump when it reaches the welding temperature and make the two workpieces fit tightly. Excessive electrode pressure will press and feed the bumps prematurely, losing the function of projection welding. At the same time, the strength of the joint will be reduced due to the reduction of current density. Too little pressure can cause serious splashing.
2. Welding time
For a given workpiece material and thickness, welding time is determined by welding current and bump stiffness. When projection welding low carbon and low alloy steels, welding time is secondary to electrode pressure and welding current. After determining the appropriate electrode pressure and welding current, adjust the welding time to obtain a satisfactory welding spot. If you want to shorten the welding time, you need to increase the welding current accordingly. However, excessively increasing the welding current may cause metal overheating and spattering. Generally, the welding time of projection welding is longer than that of spot welding, and the current is smaller than that of spot welding.
3. Welding current
The current required for each welding point of projection welding is smaller than that of spot welding the same welding point. However, the current must be able to melt the bumps before the bumps are completely crushed. The recommended current should be a relatively large current that will not squeeze out too much metal under appropriate electrode pressure. For a certain bump size, the amount of metal extruded increases with increasing current. Extruding metal can be reduced by using increasing amplitude modulation current. Like spot welding, the performance and thickness of the metal to be welded are still the main basis for selecting the welding current.
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