Weld bead morphology plays an important role in welding procedure specification and welding process planning.In order to obtain the quantitative relationship between process parameters and weld morphology of DH36 mari...Weld bead morphology plays an important role in welding procedure specification and welding process planning.In order to obtain the quantitative relationship between process parameters and weld morphology of DH36 marine steel plate,grey correlation method was used to study multiple morphology characteristics simultaneously.Eighteen experimental runs were proposed according to orthogonal method.With grey correlation theory,three response objectives,aspect ratio,depth of penetration and weld were transformed into a single grey correlation grade(GRG).The process parameters were quantitatively correlated to the GRG value and optimized with the target of maximum aspect ratio,minimum depth of penetration and maximum weld area.The results show that the optimized weld bead morphology is better than other weld bead morphology.The relative error of the predicted GRG with respect to the actual value is 5.06%,which further verifies the accuracy of the established model.The microstructure and hardness analysis suggests that the optimized welded joint has obtained required mechanical properties.The research outcomes provide a theoretical basis for multi-objective optimization of arc welding morphology in practical applications.展开更多
文摘目的通过品管圈管理来保证检验样本采集时间的准确,从而保证样本质量,为医学实验室检验前管理提供新手段。方法在我院2016年11月-2018年11月期间,随机抽取1 000例患者检验样本对其进行研究,对比组患者(n=500)采取传统样本采集流程及常规管理法,观察组患者(n=500)采取移动护理信息系统PDA(Personal Digital Assistant)样本采集流程及品管圈管理法,对比两组方法样本超时率和危急值样本率。结果观察组患者样本超时率和危急值样本率均要少于对比组(P <0.05)。结论采用PDA样本采集流程和品管圈管理法后,保证了检验样本采集时间的准确,优化了采集流程,降低了样本超时率和危急值样本率,提高了样本质量,具有推广应用价值。
基金Natural Science Foundation of Fujian Province(Grant No.2020J01873)Technology Major Project of Fujian Province(Grant No.2020H03018).
文摘Weld bead morphology plays an important role in welding procedure specification and welding process planning.In order to obtain the quantitative relationship between process parameters and weld morphology of DH36 marine steel plate,grey correlation method was used to study multiple morphology characteristics simultaneously.Eighteen experimental runs were proposed according to orthogonal method.With grey correlation theory,three response objectives,aspect ratio,depth of penetration and weld were transformed into a single grey correlation grade(GRG).The process parameters were quantitatively correlated to the GRG value and optimized with the target of maximum aspect ratio,minimum depth of penetration and maximum weld area.The results show that the optimized weld bead morphology is better than other weld bead morphology.The relative error of the predicted GRG with respect to the actual value is 5.06%,which further verifies the accuracy of the established model.The microstructure and hardness analysis suggests that the optimized welded joint has obtained required mechanical properties.The research outcomes provide a theoretical basis for multi-objective optimization of arc welding morphology in practical applications.
