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利用焊接残余应力沿y轴 (焊缝 )方向分量σy 关于坐标x的近似函数 ,由有限个测点数组 ,经过数字曲线拟合 ,求出焊缝中心部位 (x =0 )的残余应力σy0 ,从而克服了磁测法较大探头接触面积对焊缝中心部位检测的困难
The residual stress σy0 at the center of the weld (x = 0) is obtained by finite-number array of measuring points through digital curve fitting using the approximate function of the component σy of the direction of the y-axis (weld) Thus overcoming the difficulty of testing the center of the weld by the contact area of the larger probe of the magnetic test