The pattern of fracture by impact penetration test and tensile fatigue test of thermite welding with stereoscan was observed,and the component of defect with energy spectrum was analyed.
结果表明:微观缺陷主要包括微孔和夹,微孔由微气孔和微缩孔组成,夹物按形和尺寸分为团簇状夹、锥状夹、粒状夹、物夹、丝状夹和混合形夹。