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Three core parameters of resistance welding machine [RW06]
Dec 29,2023
The core process parameters of resistance welding machine are electrode pressure, welding time and welding current.
1.Electrode pressure
The electrode is determined by the properties of the welded metal, the size of the projection and the number of projections produced in a single weld. The electrode pressure should be sufficient to completely crush the projection when it reaches the welding temperature and to allow the two workpieces to fit together.
If the electrode pressure is too high, the projection will collapse prematurely, and the effect of projection welding will be lost. At the same time, the strength of the solder joint will be reduced because of the decrease of the current density.
On the contrary, too little electrode pressure may cause serious spatter.
2.Welding time
For a given workpiece material and thickness, the welding time is determined by welding current and projection stiffness. In the projection welding of low carbon steel and low alloy steel, the welding time is less important than the electrode pressure and welding current. After the suitable electrode pressure and welding current are determined, the welding time is adjusted to obtain a satisfactory solder joint.
If you want to shorten the welding time, you have to increase the welding current, but too much welding current may cause metal overheating and spatter. Usually welding time of projection welding is longer than that of spot welding, while the welding current of projection welding is lower than that of spot welding.
3.Welding current
The current required for projection welding of a solder joint is less than that required for spot welding of the same solder joint, but the current must melt the projection before it completely collapses. The recommended current should be the maximum current not to extrude too much metal at suitable electrode pressure.
For certain size projections, the amount of metal extruded increases with the increase of current. Increasing amplitude modulation current can reduce the extruded metal. As with spot welding, the properties and thickness of the weld metal are still the main criteria for selecting the welding current.
In multi-spot projection welding, the total welding current is approximately the current required for each projection times the number of projections, but taking into account the tolerance of the projections, the shape of the workpiece, and the impedance of the welder's secondary circuit, etc. , some adjustments may be needed.
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Wuxi HAIFEI Intelligent Equipment Co., Ltd.
Wuxi HAIFEI Welding Equipment Co., Ltd.
Add: 28 Shuiyun Road, Yuecheng, Jiangyin, Jiangsu Province, China. (Postal Code: 214404)
Mobile: +86 18915302352
Email: wushijie@jshaifei.com