A new twin-tungsten TIG （T-TIG） welding method was studied. This method differs from the conventional TIG method, it places two electrodes insulated from each other in the same welding torch, and a coupling arc is g...A new twin-tungsten TIG （T-TIG） welding method was studied. This method differs from the conventional TIG method, it places two electrodes insulated from each other in the same welding torch, and a coupling arc is generated from the two electrodes. The coupling arc pressure was measured and preliminary welding experiment was made. The results show that the coupling arc can keep arc pressure at a low level compared with conventional TIG arc, and welding can be achieved under higher current and high travel speed with sound appearance of weld. Therefore, this new method can applied widely in high effwiency welding.展开更多
Twin-tungsten TIG welding was developed, in which two electrodes were placed in a single welding torch. In order to master this process, the arc physics characteristic was studied. The twin-tungsten coupling arc shape...Twin-tungsten TIG welding was developed, in which two electrodes were placed in a single welding torch. In order to master this process, the arc physics characteristic was studied. The twin-tungsten coupling arc shape was observed by using CCD camera, and the arc pressure was measured. The results show that the coupling arc includes two arcs that pull each other according to Lorentz force and one big coupling arc is formed; the coupling arc pressure is much lower than that of conventional TIG arc. In the end, a simple welding experiment was carried out. This proves that stable welding process can be achieved by twin-tungsten TIG at higher current than that of conventional TIG because of its low arc pressure and the high efficiency welding is realized.展开更多
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
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A new twin-tungsten TIG （T-TIG） welding method was studied. This method differs from the conventional TIG method, it places two electrodes insulated from each other in the same welding torch, and a coupling arc is generated from the two electrodes. The coupling arc pressure was measured and preliminary welding experiment was made. The results show that the coupling arc can keep arc pressure at a low level compared with conventional TIG arc, and welding can be achieved under higher current and high travel speed with sound appearance of weld. Therefore, this new method can applied widely in high effwiency welding.
文摘Twin-tungsten TIG welding was developed, in which two electrodes were placed in a single welding torch. In order to master this process, the arc physics characteristic was studied. The twin-tungsten coupling arc shape was observed by using CCD camera, and the arc pressure was measured. The results show that the coupling arc includes two arcs that pull each other according to Lorentz force and one big coupling arc is formed; the coupling arc pressure is much lower than that of conventional TIG arc. In the end, a simple welding experiment was carried out. This proves that stable welding process can be achieved by twin-tungsten TIG at higher current than that of conventional TIG because of its low arc pressure and the high efficiency welding is realized.
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。
