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通过分析锻焊闸阀阀体环缝焊接产品模拟件的工艺特点,采用真空电子束焊接,选用SA106B,规格为φ404 mm×73 mm的大口径钢管来模拟锻焊闸阀的产品试样,确定合理的焊接工艺参数,试验获得了高质量的焊接接头,为阀门阀体以及大厚度产品电子束焊接积累了经验. 相似文献
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15-5PH steel is one of the martensitic precipitation-hardened stainless steels, which is extensively applied in the aero shafts, and electron beam welding is a significant procedure to manufacture the parts. To verify the dimension accuracies and properties, EBW with oscillation was employed on the cylinders of 15-5PH steel. The welding distortions were measured, and the microstructures and tensile properties of the joints were investigated. The weld appearances of the cylinders were smooth, and the morphology was parallel. After EBW, the shrinkages of the cylinders were above ?0.22?mm, and the welding distortions were ?0.66 to ?1.1‰, and the straightnesses were less than 1‰ due to the distortions. The martensites and a few austenites were in the welds of the cylinders after heat treatment, and the microhardnesses in the welds were 445 HV0.2, which were bigger and more homogeneous than those of the as-welded. The tensile strength and yield strength of the joints were respectively 1300 and 1150?MPa, which were higher than those of the as-welded joints, and the elongation rate of the joints was 10%. The microstructures and properties of the cylinders conformed to the aero shafts, which was attributed to the microstructure transformation with oscillation EBW and heat treatment. 相似文献
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H. Masny 《Materialwissenschaft und Werkstofftechnik》2007,38(7):528-532
Non vacuum electron beam welding – from development to industrial application Attributable to the increasing degree of standardisation in many fields of industrial manufacturing, the saving of resources and thus the demand for light weight constructions and also the rapid development on the material sector have made joining tasks increasingly complex. This involves the joining method which must meet the metallurgical demands of the base materials to be welded and also the method’s profitability. In this connection, electron beam welding in atmosphere – NV‐EBW ‐ as a joining method is getting more and more important and is, from the side of the industry, becoming increasingly popular. NV‐EBW combines the many, well‐known advantages of electron beam welding in vacuum with the possibility to work under normal ambient pressure. With an equipment efficiency of more than 50 % and very high, achievable welding speeds of up to 60 m/min for aluminium materials, the electron beam in atmosphere is an efficient and profitable tool for welding. Under the direction of Professor U. Dilthey, the ISF has for many years and in close contact with industrial partners carried out research work in the field of the NV‐EBW technology. At that, elementary contribution to the development of rotationally‐symmetrical orifice assemblies and also to the testing and optimization of the method with regard to respective welding tasks has been carried out. 相似文献
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高能加速器纯铌超导腔内导体,要求加工后的外表面光滑平整,以保证其特殊性能的要求。在电子束平焊全熔透情况下,超导腔焊缝正面在反冲压力作用下易发生未焊满及塌陷等缺陷。本文采用合适的电子束横焊工艺参数,得到了符合工艺要求的正面余高焊缝。并且建立了3mm厚的高纯铌板横焊过程的二维模型,针对不同的焊接参数分别设计了不同尺寸和形状的熔池,结合VOF算法,模拟焊接熔池里液态金属自由表面存在状态,得到了不同焊接参数下熔池的演变过程。实验结果显示,焊接熔宽随焊接线能量的升高而增大,数值模拟与实验结果较吻合。 相似文献
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通过对Ti-6Al-4V合金板材预制一定深度的疲劳裂纹,研究母材与焊缝区疲劳裂纹尖端的TEM显微形态。结果表明:经历疲劳循环后,位错密度大大增加,α/β相界面位错密度高,易成为位错形核的源区;在周期性疲劳载荷的作用下,位错以源区为原点呈放射状向四周发散运动;在焊缝区马氏体板条之间的细碎相之间,位错聚集严重,说明细碎相也易成为位错萌生的源区,从而成为疲劳裂纹形核的源区;在焊缝区马氏体板条宽度越窄,位错聚集密度越高,易成为疲劳裂纹萌生的位置。此外,TEM观察证实了裂纹尖端存在一定尺寸的塑性变形区。通过焊接接头分区的TEM对比分析,获得焊缝区比母材区更易萌生疲劳裂纹的相关证据。 相似文献
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研究退火对电子束焊接Ti-22Al-25Nb/TC11接头组织和拉伸性能的影响。结果表明,在TC11侧热影响区,出现针状α相;而在Ti-22Al-25Nb侧热影响区,出现少量的α2相和O相;经过退火处理后焊缝区缺陷有小幅度改善,沿晶界出现了细小的点状和针状析出相;焊态的Ti-22Al-25Nb/TC11试样抗拉强度低、塑性差,退火处理后的室温拉伸性能无改善甚至有所降低。要更大程度地消除缺陷、提高性能,只能通过压力加工的方式配合后续热处理才能实现。 相似文献
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