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提出两种利用扫描电镜（ＳＥＭ）和计算机进行分形分析的方法，并对异种钢焊接接头进行分维测量．结果表明：用扫描电镜进行材料断口分形分析时，选取合适的放大倍数对分形维数值的客观性很重要；异种钢焊接接头断口中具有韧窝断口的焊缝区比具有脆性解理断口的母材区分形维数值大．
Two methods of fractal analysis using SEM and computer are proposed, and the fractal dimension of dissimilar steel welded joint is measured. The results show that it is very important to choose the appropriate magnification factor for the fractal dimension of the material fracture by scanning electron microscopy. The weld zone with dimple fracture in dissimilar steel welded joint fracture is more important than the fracture with brittle cleavage fracture Material area fractal dimension value.