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简述了一种检测高速钢钻头摩擦焊接头缺陷的新方法——初始幅值磁导率法，并介绍了基于初始幅值磁导率法的ＳＧＦ－ⅡＷ型数字式钢铁材质自动分选仪［１］的原理，以及检测摩擦焊接头缺陷的研究结果。
A new method of detecting the defect of high speed steel bit friction welding joint is introduced - the initial amplitude magnetic permeability method, and the SGF-ⅡW digital steel material automatic sorting instrument based on the initial amplitude magnetic permeability method [1] principle, as well as the test results of the test of friction welding defects.