熔核直径，是指点焊熔核直径的无损检测方法。
...熔核直径； 温度场 中图分类号： TG 453.9 文献标志码： A Service [gap=684]h strength hot-formed steel , resistance spot welding , numerical simulation , nugget size , temperature field..
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动态电阻曲线频谱图中也同样可以提取出与熔核直径相关的信息。
The correlated information can be picked up in the frequency spectrum charts of dynamic resistance curves.
从电流信号的频谱图中寻找与熔核直径相关的特征，建立起电流频谱与熔核直径的关系曲线。
The characteristic of the correlation between frequency spectrum and nugget size is studied, and the relationship is founded.
采用与模拟一致的工艺参数对铝合金板材分别进行点焊实验，制取接头低倍金相照片，并测量熔核直径和焊透率。
Do spot welding experiments to aluminum alloy plate in the same condition of simulation, prepare low magnification metallographic photos of joint, and measure nugget diameter and penetration rate.
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