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wyb1988

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[交流] 【求助】传动轴轴管焊缝两侧硬度不对称?

老师让我给一个传动轴轴管焊缝打硬度,是做好的金相试样,垂直于焊缝打一条直线,用的是显微维氏硬度计,打了两次,硬度曲线都不对称,尤其是基体,相差十几个VHN,不知是怎么回事,请教一下大家。
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