Model of dynamic resistance and nugget diameter of spot welding of dual-phase steel

BAO Yefeng; WU Chen; YAO Ziling; CHEN Hui; JIANG Yongfeng

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Model of dynamic resistance and nugget diameter of spot welding of dual-phase steel
Vol. 48, Issue 12, Pages: 50-54(2018)
Published：2018
DOI：
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DOI：

BAO Yefeng, WU Chen, YAO Ziling, et al. Model of dynamic resistance and nugget diameter of spot welding of dual-phase steel[J]. Eletric Welding Machine2018, 48(12): 50-54. DOI：

摘要

采用积分法计算电阻点焊的动态电阻

分析点焊过程中动态电阻的变化特点。根据双相钢点焊熔合阶段体电阻和接触电阻的变化规律

建立了"熔核直径-动态电阻"模型。选取双相钢DP600为试验材料

用自制的点焊质量预测系统测量点焊过程中的动态电阻

用金相法测量熔核直径

得到不同电流条件下的动态电阻和熔核直径

采用最小二乘法拟合得到DP600钢点焊的"熔核直径-动态电阻"模型参数。验证试验结果表明

用该模型预测的熔核直径的平均绝对误差与相对误差分别为0.13 mm和2.28%

模型的精度较高。

Abstract

Integration algorithm is used to calculate dynamic resistance of resistance spot welding. A model of "nugget diameter-dynamic resistance" is established according to the change rules of body resistance and contact resistance of sopt welding of dual-phase steel.DP600 dual-phase steel is selected as the test material

a self-developed spot welding quality prediction system is used to measure the dynamic resistance in spot welding process

and nugget diameter is measured by metallographic method

the values of dynamic resistances and nugget diameters in different current conditions are acquired

the model parameters of "nugget diameter-dynamic resistance" of spot welding of DP600 steel are obtained by the least square method. The test results show that the mean absolute error and relative error of nugget diameter predicted by this model is 0.13 mm and 2.28% respectively. This model has higher accuracy.