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Advantages and disadvantages of nut projection welding [PW02]
Dec 23,2023
The nut projection welding is one kind of resistance welding method. One or more projection points are pre-processed on the bonding surface of a nut generally. The nut will be contacted, pressurized to the surface of another workpiece. Next electricity goes through them and heat them up. After the projection points are crushed, these contact points form solder joints. Projection welding can be used instead of spot welding to weld small parts to each other or to weld small parts to large parts.
Advantages of nut projection welding
1.Multiple solder joints can be welded simultaneously in one welding cycle of the projection welder. How many solder joints can be welded at a time depends on the uniform electrode force and welding current applied by the welder to each projection.
2.Because the welding current is concentrated on the projection points, and there is no problem of diverting through the adjacent solder joints, a smaller lapping and a smaller point distance are available.
3.The position of projection solder joint is more accurate than that of spot solder joint, and the size of the projection solder joint is uniform, so the quality of projection solder joint is more stable. The size of projection solder joint is smaller than that of spot welding joint.
4.Since the projection points can be set all on one part, the marks on the exposed surface of another part can be minimized.
1.The large flat electrode used in projection welding has much less heat and wear than the electrode in spot welding, which prolonging the service life of the electrode and thus saving the time of trimming and disassembling the electrode, and reducing the electrode maintenance cost.
2.Since it is possible to weld multiple points at the same time with smaller projection points, welded components with small deformation are available.
3.Projection welding can effectively overcome the nugget deviation. Projection welder is capable of welding parts with a large thickness ratio (up to 6:1).
Disadvantages of nut projection welding
1.Sometimes additional work is required to prefabricate one or more projection points.
2.When welding several solder joints with the same electrode at the same time, the alignment of the workpiece and the size (especially the height) of the projection points must be maintained with high precision tolerances to ensure uniform electrical force and welding current, so that the quality of each solder joint keeps uniform.
3.To weld multiple solder joints at the same time, it is necessary to use a high-power welding machine with high electrode force and high mechanical accuracy. And its pressurizing mechanism should have high mobility.
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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