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Process Difficulties of Motor Copper-Terminal Welding with Medium-Frequency Spot-Welder
Sep 27,2026
Motor copper terminals are key components for conductive connection of motor leads. Weld spots must not only guarantee connection strength but also maintain stable low contact resistance, without overheating or falling off under sustained motor vibration and current-impact conditions. The medium-frequency spot-welder delivers stable output and controllable nugget formation, but copper itself conducts heat quickly and has low resistivity.
I Core Welding Difficulties Arising from Material Characteristics
1.Copper conducts heat quickly. The heat generated during welding rapidly diffuses into the base material, making it hard to retain heat in the welding zone, easily causing false joints that look intact on the surface but have insufficient internal nuggets.
2.Copper itself is difficult to heat-generate, and the process adjustability range is very narrow. A slight parameter deviation produces two extremes: insufficient heat causes cold joints, while excessive heat causes terminal ablation and spatter.
3.Copper is relatively soft and easily softens at high temperature. Improper control of pressure and heat input causes terminal collapse and excessively deep indentations.
II Workpiece Interface and Positioning Control Difficulties
1.Copper terminal surfaces easily form oxide films. Residual oil and dust from processing form an isolation layer at the lap interface, hindering metal fusion.
2.Terminals are prone to warpage after stamping, producing local gaps at the lap position and uneven contact resistance during welding.
3.When terminals are welded simultaneously, workpiece positioning offset causes inaccurate electrode centering and uneven single-point force application.
III Electrode Process Difficulties
1.High-temperature-softened copper easily adheres to electrode end faces, degrading end-face flatness and changing contact conditions.
2.Continuous electrode use causes gradual wear, changing end-face shape, shifting current distribution, and producing local non-fusion at weld spots.
3.Blocked electrode cooling channels cause heat accumulation, continuously rising electrode temperature, further aggravating copper sticking and workpiece surface blackening, and shortening electrode service life.
IV Process Parameter and Time-Sequence Matching Difficulties
1.Insufficient pre-pressing time prevents full compression of lap gaps; excessively long pre-pressing compacts the workpiece, lowering contact resistance, insufficient heat generation and causing cold joints.
2.Excessively high current easily causes spatter and terminal blackening; insufficient current gives insufficient nugget formation.
3.Insufficient hold-pressure time causes micro-cracks during nugget cooling shrinkage, and weld spots easily loosen after long-term motor vibration.
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