为获得神州系列某型号5A06铝镁合金过滤器产品电子束焊端面优良焊缝,需要通过大量试验以获得最佳焊接参数。故利用Minitab中的田口方法来减少试验次数,降低研发成本,并评定焊接因子及其交互作用对焊缝的影响,最终得出各焊接因子对焊缝...为获得神州系列某型号5A06铝镁合金过滤器产品电子束焊端面优良焊缝,需要通过大量试验以获得最佳焊接参数。故利用Minitab中的田口方法来减少试验次数,降低研发成本,并评定焊接因子及其交互作用对焊缝的影响,最终得出各焊接因子对焊缝质量影响的主次,为焊接工艺优化及熔池研究提供焊接工艺参数。优化结果:聚焦电流274 m A,焊接束流14.5 m A,焊接速度5 rpm,高压60 k V,工作距离52 mm,向材料内部聚焦0.1 mm为最佳参数组合,且3个焊接因子中聚焦中心对焊缝成形影响最大。通过试验对优化后的焊接工艺参数进行验证,满足产品质量要求。结果表明,该方法可为铝合金电子束端面焊接合理选择焊接工艺参数和保证焊接质量提供参考依据。展开更多
焊接是汽车车身制造的一个关键环节,焊接质量的好坏严重影响汽车车身质量,所以焊接参数的选择至关重要.针对薄板焊接质量控制问题,论文利用BP神经网络解决非线性问题的优势,建立焊接变形量与工艺参数之间映射关系模型;结合遗传算法构建...焊接是汽车车身制造的一个关键环节,焊接质量的好坏严重影响汽车车身质量,所以焊接参数的选择至关重要.针对薄板焊接质量控制问题,论文利用BP神经网络解决非线性问题的优势,建立焊接变形量与工艺参数之间映射关系模型;结合遗传算法构建基于遗传神经网络焊接的工艺参数优化系统;同时设计正交试验,将该方法与正交试验法相对比.结果表明,该方法可以有效地实现CMT(cold metal transfer)点焊焊接变形预测与工艺参数优化.通过预测模型给出合理参数,指导钢薄板和铝合金薄板的CMT点焊变形试验,提高焊接的效率.展开更多
Novel hybrid refill friction stir spot welding （RFSSW） assisted with ultrasonic oscillation was introduced to 5A06 aluminum alloy joints. The metallographic structure and mechanical properties of 5A06 aluminum alloy...Novel hybrid refill friction stir spot welding （RFSSW） assisted with ultrasonic oscillation was introduced to 5A06 aluminum alloy joints. The metallographic structure and mechanical properties of 5A06 aluminum alloy RFSSW joints formed without ultrasonic assistance and with lateral and longitudinal ultrasonic assistance were compared, and the ultrasonic-assisted RFSSW process parameters were opti- mized. The results show that compared with lateral ultrasonic oscillation, longitudinal ultrasonic oscillation strengthens the horizontal bond- ing ligament in the joint and has a stronger effect on the joint＇s shear strength. By contrast, lateral ultrasonic oscillation strengthens the ver- tical bonding ligament and is more effective in increasing the joint＇s tensile strength. The maximum shear strength of ultrasonic-assisted RFSSW 5A06 aluminum alloy joints is as high as 8761 N, and the maximum tensile strength is 3679 N when the joints are formed at a tool rotating speed of 2000 r/rain, a welding time of 3.5 s, a penetration depth of 0.2 mm, and an axial pressure of 11 kN.展开更多
文摘为获得神州系列某型号5A06铝镁合金过滤器产品电子束焊端面优良焊缝,需要通过大量试验以获得最佳焊接参数。故利用Minitab中的田口方法来减少试验次数,降低研发成本,并评定焊接因子及其交互作用对焊缝的影响,最终得出各焊接因子对焊缝质量影响的主次,为焊接工艺优化及熔池研究提供焊接工艺参数。优化结果:聚焦电流274 m A,焊接束流14.5 m A,焊接速度5 rpm,高压60 k V,工作距离52 mm,向材料内部聚焦0.1 mm为最佳参数组合,且3个焊接因子中聚焦中心对焊缝成形影响最大。通过试验对优化后的焊接工艺参数进行验证,满足产品质量要求。结果表明,该方法可为铝合金电子束端面焊接合理选择焊接工艺参数和保证焊接质量提供参考依据。
文摘焊接是汽车车身制造的一个关键环节,焊接质量的好坏严重影响汽车车身质量,所以焊接参数的选择至关重要.针对薄板焊接质量控制问题,论文利用BP神经网络解决非线性问题的优势,建立焊接变形量与工艺参数之间映射关系模型;结合遗传算法构建基于遗传神经网络焊接的工艺参数优化系统;同时设计正交试验,将该方法与正交试验法相对比.结果表明,该方法可以有效地实现CMT(cold metal transfer)点焊焊接变形预测与工艺参数优化.通过预测模型给出合理参数,指导钢薄板和铝合金薄板的CMT点焊变形试验,提高焊接的效率.
基金financially supported by Hunan Science and Technology Research Projects(Nos.2016GK2021 and 2016TP1023)Hunan Provincial Natural Science Foundation of China(No.2016JJ4082)
文摘Novel hybrid refill friction stir spot welding （RFSSW） assisted with ultrasonic oscillation was introduced to 5A06 aluminum alloy joints. The metallographic structure and mechanical properties of 5A06 aluminum alloy RFSSW joints formed without ultrasonic assistance and with lateral and longitudinal ultrasonic assistance were compared, and the ultrasonic-assisted RFSSW process parameters were opti- mized. The results show that compared with lateral ultrasonic oscillation, longitudinal ultrasonic oscillation strengthens the horizontal bond- ing ligament in the joint and has a stronger effect on the joint＇s shear strength. By contrast, lateral ultrasonic oscillation strengthens the ver- tical bonding ligament and is more effective in increasing the joint＇s tensile strength. The maximum shear strength of ultrasonic-assisted RFSSW 5A06 aluminum alloy joints is as high as 8761 N, and the maximum tensile strength is 3679 N when the joints are formed at a tool rotating speed of 2000 r/rain, a welding time of 3.5 s, a penetration depth of 0.2 mm, and an axial pressure of 11 kN.
