但是在许多情况下，钻孔法是用于测量焊接残余应力，而该应力峰值往往接近材料的屈服极限。
But this method is used to determine welding residual stresses in many cases where the stress peaks are often near the material's yield strength.
数据处理方法是将初始磁致伸缩平均值和终了磁致伸缩平均值用一个公式处理，得到残余应力变化情况。
The data processing method USES a formula to process the initial magnetostrictive average and the final magnetostrictive average, to obtain the residual stress changes instance.
残余拉应力区宽度变大。 文中还给出了焊后热处理后的应力大小情况，以证明焊后热处理能改善应力分布。
The weld residual stress by PWTH is discussed in order to prove that PWTH can really improve the distribution of stress.
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