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Multi‑Harness Welding with Medium‑Frequency Spot‑Welder: How to Avoid Wire‑Fraying Process Problems
Sep 16,2026
Multi‑strand copper‑harness spot‑welding is a common process in production of new‑energy, energy‑storage and electronic‑control equipment. Medium‑frequency spot‑welding of wire harnesses tends to cause defects such as wire‑end fraying, wire bursting, wire warping, wire detachment and wire breakage. Blindly increasing current and pressure upon fraying will crush copper wires, deform harnesses, bring insufficient tensile strength and reject products for poor appearance.
I Process Characteristics Prone to Harness Fraying
1.Harnesses adopt multi‑strand twisted structures with numerous inter‑wire gaps and loose texture; wires easily shift and flip outward under welding pressure.
2.Fine single copper wires feature poor heat resistance; instantaneous high temperature and heavy‑current shock readily melt and burst wires.
3.Stacked multi‑harness workpieces tend to be uneven and position‑shifted; uneven force‑bearing during welding causes local suspension and wire bursting.
4.Copper delivers heat fast; uneven heat diffusion generates dual defects: surface‑layer wire melting and inner‑layer cold joints.
II Common Harness‑Fraying Defects
1.Wire bursting upon energization and fuzzy wire ends
2.Edge wire warping and outward‑flipping fraying
3.Layered wire detachment and inner‑layer fraying from cold joints
4.Over‑heating embrittlement and wire breakage
III Process Key Points to Avoid Harness Fraying
1.Pre‑wire sorting treatment to eliminate looseness from source
2.Optimize pressure time‑sequence: slow pre‑pressing and forming under holding pressure
3.Gentle temperature‑control fusion to avoid wire bursting caused by excessive heat
4.Match dedicated electrodes to guarantee even force distribution
5.Adopt dedicated limiting tooling to restrain harness displacement
6.Stabilize equipment working conditions to prevent batch‑wise quality drift
Wuxi Haifei Intelligent Equipment Co., Ltd. https://www.haifeiwelder.com/
Wuxi Haifei Intelligent Equipment Co., Ltd. has been focusing on the R&D and production of spot‑welding machines for 17 years. The company has obtained ISO9001 Quality Management System Certification, China Compulsory Certification (3C) and CE Certification. It is a National High‑tech Enterprise, a Specialized, Refined, Differential and Innovative Enterprise of Jiangsu Province, a Specialized, Refined, Differential and Innovative Enterprise of Wuxi, and a Gazelle Enterprise in the Southern Jiangsu National Self‑Dependent Innovation Demonstration Zone.
Should you be interested in our spot‑welding machines, please contact us: 400‑0510‑750.
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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