| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for estimating the nugget diameter during the welding with high accuracy. SOLUTION: A regression line, an intersection of the line of the inclination 0 with the regression line of maximum inclination (imaginary saturation point), the imaginary saturation time T1 to the imaginary saturation point, and the displacement h between electrodes from the imaginary saturation point to the hold release are obtained from the displacement between electrodes from the hold start to the hold release as an approximation shown in the formula (1). Then, multiple regression formula shown in (2) is obtained from the imaginary saturation time T1, the inclinationθ1 of the regression line of maximum inclination, the intercept HT0 of the regression line of maximum inclination of the time axis 0, and the coefficients a, b and c in the formula (1). T1,θ1, HT0, a, b, and c are obtained from the displacement between the electrodes during the welding, and the nugget diameter y is calculated from the formula (2). h=a×T<2> +b×T+c...(1), and y=r0+r1×a+r2×b+r3×c+r4×T1+r5×θ1+r6×HT0...(2), where r0 to r6 are partial regression coefficients.
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