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Zero Lack-of-Penetration Welding Technology for Multi-layer Aluminum Foil Laminates on Servo Polymer Diffusion Welders
Aug 07,2026
Multi-layer aluminum foil laminates are core components for new energy batteries and photovoltaic energy storage. Servo polymer diffusion welders realize tight interlayer aluminum bonding without filler metal through precise temperature & pressure control. Lack-of-penetration is a frequent hidden defect inside foil layers, which reduces product conductivity and mechanical strength, brings safety risks and raises production costs.
I Manifestations & Hazards of Lack-of-Penetration
1.Manifestations: Tiny invisible gaps between aluminum layers or only superficial bonding with local separation; partial oxidation spots and surface blackening on interfaces.
2.Hazards: Poor conductivity leads to overheating and shortened service life; weak tensile & bending resistance causes circuit breakage upon fracture; gaps trap dust & water to accelerate oxidation, potentially triggering short circuits or fires; mass defects waste materials and delay production schedules.
II Root Causes of Lack-of-Penetration
1.Inadequate pre-welding preparation: Unremoved oxide film, oil & dust on aluminum foil; irregular cutting with burrs create gaps during lamination and block interlayer fusion;
2.Unreasonable process parameters: Excessively high/low temperature, improper holding time, rapid heating/cooling damage aluminum foil and aggravate oxidation;
3.Abnormal equipment performance: Deviated servo temperature-pressure control, worn positioning fixtures, residual contaminants disturb welding precision;
4.Non-standard operation & environment: Incomplete cleaning, misaligned uncompressed foil, arbitrary parameter adjustment; humid, dusty, corrosive workshop air speeds up aluminum oxidation.
III Methods to Avoid Lack-of-Penetration
1. Complete Pre-Welding Preparation
Remove oxide film, grease and dust on aluminum foil; grind and clean then weld immediately to prevent secondary oxidation. Cut foils neatly without burrs, align and compact during stacking; split welding for ultra-thick multi-layer products. Select matched fixtures for tight clamping.
2. Optimize Process Parameters
Leverage servo machine’s precise temperature-pressure control; adjust temperature, pressure and holding time based on foil thickness & layers. Adopt stepped heating and slow cooling for uniform heat penetration and stress relief.
3. Equipment Commissioning & Maintenance
Calinate temperature-pressure control systems regularly, clean machine surfaces daily, replace worn parts timely. Activate real-time monitoring and halt production once parameters drift. Custom exclusive fixtures for accurate positioning and full compaction.
4. Standardize Operation & Workshop Environment
Operate per specifications without random parameter modification; verify foil alignment & parameter correctness before welding. Implement post-welding sampling inspection. Keep workshop dry & ventilated; store aluminum foil hermetically with anti-corrosion protection if 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