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0 IntroductionTheweldedjoint,becauseofitsheterogeneityinmicrostructure,discontinuousingeometricalshapeandseriousweldingresidualstress,isveryheterogeneousinmechanicalproperties,thusitaffectstheworkingsafetyofweldmentseriously.Itisveryimportantandverynece… 相似文献
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护肤品在2000年将成为化妆品市场的主导。生产在科技与自然之间取得协调发展的护肤品对生产商日益显得重要他们8正努力寻求适用于不同消费的恰当产品,而消费者的正直需求是有针对笥的护肤产品,因此护肤品市场发展前景喜人,机会良好人。 相似文献
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蒸汽轮机自带冠静叶隔板是蒸汽轮机通流部分的静子部件 ,其制造精度直接影响到整个机组的效率。在实际生产中发现自带冠叶隔板焊后节圆直径变形大 ,严重影响了隔板通流尺寸精度。文中针对蒸汽轮机自带冠叶隔板生产过程中产生的焊接变形问题 ,采用定点测试方法 ,进行现场跟踪监测 ,获得了有效的焊接变形数据。并对自带冠叶隔板主焊缝焊接后和热处理后的节圆半径变形、直径变形和节圆收缩率进行了深入分析。为了减小焊接变形 ,在隔板的结构设计方面应控制主焊缝进汽侧与出汽侧的坡口深度比值在 1.0~ 1.15范围内 相似文献
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Within the bonded interface of metal bars joint produced by conventional solid state bonding process ( such as flash welding, resistance butt welding, friction welding and so on), the inclusions are often present, which degrade the ductility of joint. A new process of transformation-diffusion brazing is proposed, in which an amorphous foil containing melting point depressant is preplaced between the interfaces to be joined, and the assembly is repeatedly heated/cooled without holding time at peak temperature. A low carbon steel bars, BNi-2 amorphous foil and resistance butt welding machine were used. The results show that surfuce contamination can be disrupted by the dissolution of base metal into molten interlayer in comparison with conventional process, and the ductility of joint can be improved by increasing the times of temperature cycles on line. In addition, transformation-diffusion brazing can be done with relatively simple and inexpensive system in comparison with transient liquid phase bonding. 相似文献