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Does the aluminum diffusion welder have requirements for the incoming material storage environment? What happens if it gets damp?
Nov 10,2026
When the aluminum diffusion welder welds products such as aluminum flexible connectors and aluminum busbars, the incoming material storage environment has a direct impact on welding quality. The surface of aluminum material is highly active, and moisture and oxidation will change the interface state and affect atomic diffusion bonding.
I. Thickening of surface oxide film and obstruction of diffusion
1. In a humid environment, the surface oxide film of aluminum material grows faster and thickens. The oxide film hinders mutual diffusion of aluminum atoms, and it is difficult to form effective metallurgical bonding at the interface.
2. The oxide film is dense and has a high melting point, is not easily completely broken through under welding temperature and pressure, and becomes an interlayer isolation layer.
3. Uneven oxide film thickness causes differences in bonding state at different positions of the same product and deteriorates consistency.
II. Adsorption of moisture and formation of bubbles due to high-temperature release
1. Moisture is adsorbed on the surface of aluminum foil and aluminum bars and between layers. Under high welding temperature, the moisture rapidly vaporizes, and the gas is sealed between layers to form bubbles and bulges.
2. The thicker the oxide layer, the more moisture it adsorbs, and the gas is continuously released under heat, making bulge defects more obvious.
3. Bubble locations reduce the bonding surface, and delamination and peeling appear after welding, reducing product density.
III. Poor interlayer fit and delamination and peeling
1. After dampening, aluminum foil is prone to sticking and warping, there are many gaps between layers during stacking, and venting is insufficient.
2. The surface water film and oxide layer separate the workpieces from contact, local diffusion is insufficient, and delamination and peeling occur after welding.
3. The bonding strength of damp incoming materials decreases after welding, and the failure rate of peel tests increases.
IV. Decline in welding stability and consistency
1. The degree of dampness of incoming materials varies, welding results fluctuate greatly under the same parameters, and batch consistency is poor.
2. Increasing temperature and extending holding time to break through the oxide layer and expel moisture easily brings new problems such as overburning and grain growth.
3. Defective products are difficult to trace, and rework and scrap costs increase.
V. Impact on equipment and molds
1. Under high temperature, moisture and volatiles corrode graphite molds, accelerating carbon buildup and aging of molds.
2. Moisture or impurities adhering to the mold surface further affect heat transfer and pressure uniformity.
3. Frequently handling damp incoming materials increases cleaning and downtime and affects production efficiency.
Wuxi Haifei Intelligent Equipment Co., Ltd. official website: https://www.haifeiwelder.com/
Wuxi Haifei Intelligent Equipment Co., Ltd. has been dedicated to the research and production of diffusion welding machines for 17 years. The company has passed the ISO9001 quality management system certification, the national 3C certification and the CE certification. It is a national high-tech enterprise, a Specialized, Refined, Distinctive and Innovative enterprise of Jiangsu Province, a Specialized, Refined, Distinctive and Innovative enterprise of Wuxi City, and a Gazelle enterprise of the Southern Jiangsu National Independent Innovation Demonstration Zone. If you are interested in our diffusion welding machines, please contact us at liuyiyu@jshaifei.com.
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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