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This paper investigates the distribution of contact resistance of the aluminum alloy in the squeeze stage. A new method of measuring path’s resistance is proposed firstly. Contact resistances are calculated accurately by the systems of 5 linear equations and solutions show that three contact resistances are different. The probability density functions of contact resistance in workpiece/workpiece(W/W) and upper electrode/workpiece(E/W) show that the curve shape has steeper peak and heavier tail than that of the normal distribution. Non-parameter hypothesis test is performed and the result shows that R2,R4 reject the normal distribution using chi-square and kolmogoroo statistic D method. Therefore, the Asymmetric Laplace distribution is fitted to empirical distributions and is applied to quantify the influence of random contact resistance. The result illustrates that AL distribution is very close to contact resistance of W/W and upper E/W and normal distribution has some deviation. The paper is helpful to research the initial nugget conditions, weldability and the transient multi-coupling field.
This paper investigates the distribution of contact resistance of the aluminum alloy in the squeeze stage. A new method of measuring path’s resistance is proposed first. Contact resistances are calculated accurately by the systems of 5 linear equations and solutions show that three contact resistances are different. The probability density functions of contact resistance in workpiece / workpiece (W / W) and upper electrode / workpiece (E / W) show that the curve shape has steeper peak and heavier tail than that of the normal distribution. Non-parameter hypothesis test is Thus, the Asymmetric Laplace distribution is fitted to empirical distributions and is applied to quantify the influence of random contact resistance. The result illustrates that that AL distribution is very close to contact resistance of W / W and upper E / W and normal distribution has some deviation paper is helpful to research the initial nugget conditions, weldability and the transient multi-coupling field.