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    • 8. 发明授权
    • Apparatus for controlling the quality of a resistance spot weld and
method therefor
    • 用于控制电阻点焊质量的装置及其方法
    • US6064029A
    • 2000-05-16
    • US90088
    • 1998-06-04
    • Jae-Sung ChoiKyung-Il KimWon-Ho Sung
    • Jae-Sung ChoiKyung-Il KimWon-Ho Sung
    • B23K11/24B23K11/10B23K11/25B23K31/12
    • B23K11/257B23K11/10B23K31/125
    • A resistance spot welding apparatus having a primary circuit, a secondary circuit and a transformer for controlling the quality of a resistance spot weld, wherein a voltage is applied to the primary circuit to thereby generating a welding current, includes a current sensor for sensing the weld current from the primary circuit, a power factor calculator, a dynamic resistance calculator, a nugget estimator and a weld current controller. In the welding apparatus, the power factor calculator calculates power factors based on the welding current. And, the nugget estimator estimates a nugget size and nugget penetration from an dynamic resistance curve by using a Hidden Markov Model method, wherein the dynamic resistance curve is obtained by the power factor calculator. The quality of the resistance spot weld is controlled by changing the welding current based on the nugget size and the nugget penetration.
    • 一种电阻点焊装置,具有用于控制电阻点焊质量的初级电路,次级电路和变压器,其中电压施加到初级电路从而产生焊接电流,包括用于感测焊接的电流传感器 来自初级电路的电流,功率因数计算器,动态电阻计算器,熔核估计器和焊接电流控制器。 在焊接装置中,功率因数计算器基于焊接电流来计算功率因数。 而且,矿块估算器通过使用隐马尔科夫模型法来估计动态电阻曲线的熔核尺寸和熔核穿透,其中动态电阻曲线由功率因数计算器获得。 电阻点焊的质量通过根据熔核尺寸和熔核穿透度改变焊接电流来控制。