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Process Optimization Directions to Avoid Burn-Through & Violent Arcing When Winding Thin Copper Foil & Nickel-Plated Materials with Capacitor Discharge Spot Welders
Jul 16,2026
Welding thin copper foil and nickel-plated materials is a frequent working procedure in power battery and energy module manufacturing. These materials are thin, high in electrical/thermal conductivity, and prone to coating damage under heat. Capacitor discharge spot welding often brings burn-through, violent arcing, heavy spatter and electrode adhesion. Recommended optimization directions:
1. Optimize Welding Energy & Waveform
1.Adopt low-energy short-pulse mode, set energy values matching material thickness.
2.Optimize rising edge slope to realize smooth current startup and eliminate concentrated energy-induced arcing & spatter.
3.Establish a "material thickness – energy output" matching curve for various foil thicknesses to reduce burn-through and arcing risks.
4.Control discharge duration reasonably to avoid over-melting and burn-through from prolonged heating.
2. Optimize Electrode Pressure & Pressing Mode
1.Raise pre-pressure appropriately and extend pre-pressing time to tightly laminate thin materials, expel interlayer air and reduce arcing.
2.Low pressure causes high contact resistance and local overheating arcing; excessive pressure crushes foil materials.
3.Adopt constant pressure control to guarantee stable uniform pressure and prevent local burn-through from pressure fluctuation.
4.Maintain holding time after welding; releasing pressure before nugget solidification generates spatter and cracking.
3. Optimize Electrode Structure & Material
1.Small curved-end electrodes are preferred for thin copper foil and nickel-plated parts to lower current density concentration and burn-through probability.
2.Select high-temperature wear-resistant electrodes to reduce adhesion with nickel coatings.
3.Keep electrode end faces smooth, burr-free and oxide-free; grind regularly to avoid arcing caused by poor contact.
4.Wide micro-arc electrodes can be used for multi-layer copper foil to distribute heat evenly and prevent concentrated hot spot burn-through.
4. Optimize Material Surface & Pre-Treatment
1.Thin copper foil and nickel-plated sheets must be clean, oil-free, oxide-free and burr-free; oil carbonization under heat triggers arcing.
2.Uneven, peeling nickel plating with exposed copper causes abrupt resistance changes and local overheating burn-through; screen incoming materials in advance.
3.Rapid vaporization of surface moisture is a major cause of arcing on thin materials.
4.Uneven, wrinkled and warped laminations create contact gaps that generate electric arcs during welding.
5. Equipment Maintenance & Parameter Control
1.Inspect capacitance regularly to avoid unstable fluctuating energy output.
2.Calibrate current & temperature parameters periodically; replace aged electrodes to eliminate arcing/spatter from oxidized poor contact.
3.Perform trial welding before each batch to verify parameter adaptability and mass burn-through faults.
6. Auxiliary Process Optimization
1.Shield gas assistance for ultra-thin copper foil welding reduces oxidation, spatter and nickel coating damage, lowering arcing risks.
2.Insert thin gaskets between electrodes and nickel-plated workpieces to disperse current, avoid single-point overheating burn-through and protect plating integrity.
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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