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What is nugget? How does nugget form? [DCS05]
Dec 22,2023
What is nugget?
The nugget formation process of intermediate frequency welder can be summarized as placing the welding piece between two electrodes, increasing electrode pressure, and releasing strong welding current to the welding area by the resistance welding transformer, which creates a real physical contact point on the weldment contact surface.
With the development of electric heating and continuous expansion, plastic energy and heat energy make the atoms at the contact point continue to stimulate, disappear the contact surface, and heat again to produce a melting core, commonly known as nugget.
How does nugget form?
Under the effect of electric power, the liquid metal in the Nugget produces obvious agitation, the metal composition in the Nugget is uniform, the bonding interface disappears rapidly. When the heating stops, the core liquid metal is semi-melted at the melting core boundary with lower free energy, and the surface of the crystal grain is the crystal core, which begins to crystallize gradually, and then continues to extend to the middle by dendrite along the opposite direction of heat dissipation.
In general, the Nuggets are grown by columnar crystal method, and the components with stronger alloy concentration are arranged at the front of the fork and dendrite until the growing dendrites are against each other to obtain firm metal bonding. And then the contact area disappears, the solder joint with sufficient columnar crystal growth is obtained.
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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)
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