采用TIG(Tungsten inert gas welding,TIG)焊对FeCrAl合金管同质材料进行焊接,通过扫描电子显微镜、透射电子显微镜及能谱仪等手段研究了焊后接头的显微组织特征、焊后接头不同区域氧化物颗粒的分布情况及焊接接头的力学性能。FeCrAl合...采用TIG(Tungsten inert gas welding,TIG)焊对FeCrAl合金管同质材料进行焊接,通过扫描电子显微镜、透射电子显微镜及能谱仪等手段研究了焊后接头的显微组织特征、焊后接头不同区域氧化物颗粒的分布情况及焊接接头的力学性能。FeCrAl合金TIG焊通过填充等成分的FeCrAl合金丝材进行焊接,焊后焊接接头主要由焊缝区、热影响区及母材组成。其中焊缝区为粗大的铁素体组织,热影响区为细小的等轴晶组织。焊缝区的Y_(2)O_(3)氧化物颗粒发生了明显粗化并与基体反应生成复合氧化物Y_(3)Al_(5)O_(12)。TIG焊焊接FeCrAl合金管热处理后,焊接接头最大抗拉强度值为530 MPa,约为母材强度的80.8%,可以实现大口径、大壁厚的FeCrAl合金管材的对接接头的力学性能要求。展开更多
The pipeline all-position automatic welding machine system is a special welding system for automatically welding circumferential joint of pipeline on site, which has been widely used to the long-distance pipeline cons...The pipeline all-position automatic welding machine system is a special welding system for automatically welding circumferential joint of pipeline on site, which has been widely used to the long-distance pipeline construction projects due to the advantages of automatic control for welding parameters at all-position, moving speed of bugs and operating. In this paper, the key control technologies of PAWM all-position automatic welding machine （ developed by Pipeline Research Institute of CNPC） such us the automatic control system, control software, personal digital assistant （PDA） software and complex programmable logic device （ CPLD ） program as well us the control method of welding parameter have been described detailedly. With the higher welding quality, higher welding effwiency and lower labor intensity, PA WM all-position automatic welding machine has been successfully applied in many famous pipeline construction projects.展开更多
All-position welding is an important technology in energy sources, chemical, shipbuilding and other industries. When welding current is larger than 200 A, the molten metal tends to flow down due to the force of gravit...All-position welding is an important technology in energy sources, chemical, shipbuilding and other industries. When welding current is larger than 200 A, the molten metal tends to flow down due to the force of gravity. In order to ＂push＂ the molten metal into the weld, a new kind of U-frame excitation model, which could produce electromagnetic force to balance the gravity of the molten pool, was designed. The related parameters of the excitation model were simulated by Maxwell 3D, and the relationships between the parameters and the magnetic induction intensity were analyzed. Finally, the electromagnetic force in the molten pool was calculated, and the appropriate parameters of the U-frame excitation model were determined. The results of the simulation verify the feasibility of the all-position welding excitation model.展开更多
目的探讨TIG模式在儿科重症监护室(pediatric intensive care unit,PICU)护士液体复苏管理培训中的应用效果。方法按病区将长沙市某三级甲等医院PICU护士分为对照组和观察组,各28例。对照组采用常规的PICU护士液体复苏管理培训方案,观...目的探讨TIG模式在儿科重症监护室(pediatric intensive care unit,PICU)护士液体复苏管理培训中的应用效果。方法按病区将长沙市某三级甲等医院PICU护士分为对照组和观察组,各28例。对照组采用常规的PICU护士液体复苏管理培训方案,观察组采用基于TIG模式的PICU护士液体复苏管理培训方案。比较2组护士对液体复苏管理的知信行水平、核心胜任力及团队合作能力。结果干预后,观察组护士的液体复苏管理的知信行水平、核心胜任力及团队合作能力均好于对照组(t=-5.231,P<0.001;t=-17.618,P<0.001;t=-8.972,P<0.001)。结论基于TIG模式的液体复苏管理培训可提高PICU护士对液体复苏管理的知信行水平、核心胜任力及团队合作能力,值得在临床推广应用。展开更多
文摘采用TIG(Tungsten inert gas welding,TIG)焊对FeCrAl合金管同质材料进行焊接,通过扫描电子显微镜、透射电子显微镜及能谱仪等手段研究了焊后接头的显微组织特征、焊后接头不同区域氧化物颗粒的分布情况及焊接接头的力学性能。FeCrAl合金TIG焊通过填充等成分的FeCrAl合金丝材进行焊接,焊后焊接接头主要由焊缝区、热影响区及母材组成。其中焊缝区为粗大的铁素体组织,热影响区为细小的等轴晶组织。焊缝区的Y_(2)O_(3)氧化物颗粒发生了明显粗化并与基体反应生成复合氧化物Y_(3)Al_(5)O_(12)。TIG焊焊接FeCrAl合金管热处理后,焊接接头最大抗拉强度值为530 MPa,约为母材强度的80.8%,可以实现大口径、大壁厚的FeCrAl合金管材的对接接头的力学性能要求。
文摘The pipeline all-position automatic welding machine system is a special welding system for automatically welding circumferential joint of pipeline on site, which has been widely used to the long-distance pipeline construction projects due to the advantages of automatic control for welding parameters at all-position, moving speed of bugs and operating. In this paper, the key control technologies of PAWM all-position automatic welding machine （ developed by Pipeline Research Institute of CNPC） such us the automatic control system, control software, personal digital assistant （PDA） software and complex programmable logic device （ CPLD ） program as well us the control method of welding parameter have been described detailedly. With the higher welding quality, higher welding effwiency and lower labor intensity, PA WM all-position automatic welding machine has been successfully applied in many famous pipeline construction projects.
基金This work was supported by the National Natural Science Foundation of China （No. 51075299）.
文摘All-position welding is an important technology in energy sources, chemical, shipbuilding and other industries. When welding current is larger than 200 A, the molten metal tends to flow down due to the force of gravity. In order to ＂push＂ the molten metal into the weld, a new kind of U-frame excitation model, which could produce electromagnetic force to balance the gravity of the molten pool, was designed. The related parameters of the excitation model were simulated by Maxwell 3D, and the relationships between the parameters and the magnetic induction intensity were analyzed. Finally, the electromagnetic force in the molten pool was calculated, and the appropriate parameters of the U-frame excitation model were determined. The results of the simulation verify the feasibility of the all-position welding excitation model.
文摘目的探讨TIG模式在儿科重症监护室(pediatric intensive care unit,PICU)护士液体复苏管理培训中的应用效果。方法按病区将长沙市某三级甲等医院PICU护士分为对照组和观察组,各28例。对照组采用常规的PICU护士液体复苏管理培训方案,观察组采用基于TIG模式的PICU护士液体复苏管理培训方案。比较2组护士对液体复苏管理的知信行水平、核心胜任力及团队合作能力。结果干预后,观察组护士的液体复苏管理的知信行水平、核心胜任力及团队合作能力均好于对照组(t=-5.231,P<0.001;t=-17.618,P<0.001;t=-8.972,P<0.001)。结论基于TIG模式的液体复苏管理培训可提高PICU护士对液体复苏管理的知信行水平、核心胜任力及团队合作能力,值得在临床推广应用。
