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铁路大锥度罐体罐车制造工艺难点解析
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作者 许勇 陈文兴 刘方方 《机车车辆工艺》 2020年第2期24-26,共3页
介绍了铁路大锥度罐体罐车制造主要工艺难点,分析了锥筒滚制母线方向控制问题、筒节相对滚轮架的轴向窜动问题、外环焊焊枪跟踪问题,并提出了最佳实施方案.
关键词 铁路罐车 大锥度罐体 锥筒滚制 轴向窜动 外环焊
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Thermo-mechanical interaction between aluminum alloy and tools with different profiles during friction stir welding 被引量:2
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作者 Min YANG Rui-jun BAO +1 位作者 Xiu-zhong LIU Chao-qun SONG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第3期495-506,共12页
The influence of the tool profiles on the thermo-mechanical interaction between AA6061-T6 workpiece and tool during friction stir welding was investigated. A customized experimental setup was employed to measure the f... The influence of the tool profiles on the thermo-mechanical interaction between AA6061-T6 workpiece and tool during friction stir welding was investigated. A customized experimental setup was employed to measure the feature points temperature and tool spindle torque in the process of FSW. Microstructure and tensile properties of stir zone (SZ) were characterized. Results indicate that the shoulder and pin geometries were responsible for the heat generation, tool torque variation at the plunging stage as well as the cross section contour of SZ, respectively. Finer grains in SZ resulted from flutes on shoulder and grooves on pin. Flat faces on the pin resulted in inhomogeneous grain size. Weld with higher 0.2% yield strength of 173 MPa was obtained by using the cylindrical pin tool while higher elongation weld of 32.0% was produced with triflat threaded pin tool. 展开更多
关键词 friction stir welding tool profile thermal cycle tool spindle torque tensile properties
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Fatigue life evaluation of girth butt weld within welded cast steel joints based on the extrapolation notch stress method 被引量:2
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作者 Wei Zezhong Jin Chuanling Jin Hui 《Journal of Southeast University(English Edition)》 EI CAS 2021年第1期59-66,共8页
The fatigue life evaluation of the girth butt weld within the welded cast steel joint was studied based on the extrapolation notch stress method.Firstly,the mesh sensitivity of the finite element model of the welded c... The fatigue life evaluation of the girth butt weld within the welded cast steel joint was studied based on the extrapolation notch stress method.Firstly,the mesh sensitivity of the finite element model of the welded cast steel joint was analyzed to determine the optimal mesh size.Based on the stress field analysis of the finite element model of the welded cast steel joint at the weld toe and weld root,the sharp model of the extrapolation notch stress method was applied to derive the effective notch stress of the rounded model belonging to the effective notch stress method,in which the key problem is to calculate the extrapolation point C,and the extrapolation point C has an exponential function relationship with the geometric parameters of the welded cast steel joint.By setting different values of geometric parameters,the corresponding value of parameter C is calculated,and then the functional relationship between the extrapolation point C and the geometric parameters can be obtained by the multiple linear regression analysis.Meanwhile,the fatigue life evaluation of the girth butt weld within welded cast steel joints based on the effective notch stress was performed according to the guideline recommended by the IIW(International Institute of Welding).The results indicate that the extrapolation notch stress method can effectively simplify the process of calculating the effective notch stress and accurately evaluate the fatigue life of the girth butt weld within welded cast steel joints. 展开更多
关键词 welded cast steel joint girth butt weld extrapolation notch stress method effective notch stress method fatigue life evaluation
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