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| 1 | Research on the Mechanism of Penetration Increase by Flux in A-TIG Welding显示文摘The mechanism of penetration depth increased by activating flux in activating tungsten inert gas (A-TIG) weldingwas studied by measuring the distribution of trace element Bi in the weld and monitoring the change of arc voltageduring A-TIG welding of stainless steel 0Crl8Ni9 with fluxes SiO2 and TiO2. The results show that the mechanismof penetration depth in A-TIG welding depends on the sort of flux used. The weld pool convection after coating theflux SiO2 and flux TiO2 is changed inversely compared with convectional TIG welding without flux. The arc voltageis increased by flux SiO2 whilst flux TiO2 does not have effect on the arc voltage. The reason of penetration depthincrease for SiO2 is due to the constriction of arc plasma and the change of surface tension gradient. The increaseof weld penetration depth with TiO2 only ascribes to the change of surface tension gradient. | Chunli YANG Sanbao LIN Fengyao LIU Lin WU Qingtao ZHANG | 2003 | Journal of Materials Science & Technology2003，19，z1： | 8 |
| 2 | Review on electromagnetic welding of dissimilar materials显示文摘Electromagnetic welding (EMW) is a high-speed joining technique that is used to join similar ordissimilar metals, as well as metals to non-metals. Thistechnique uses electromagnetic force to mainly joinconductive materials. Unlike conventional joining pro-cesses, the weld interface does not melt, thus keeping thematerial properties intact. Extremely high velocity andstrain rate involved in the process facilitate extending theEMW technique for joining several materials. In this paper,the research and progress in electromagnetic welding arereviewed from various perspectives to provide a basis forfurther research. | K. SHANTHALA T. N. SREENIVASA | 2016 | Frontiers of Mechanical Engineering2016，11，4： | 4 |
| 3 | Study on design pressure of in-service welding pipes显示文摘A method of predicting design pressure and burn-through of in-service welding pipes was established. Temperature distributions of in-service welding under variable parameters were simulated by FEM. The effect of flowing of internal media was regarded as forced convection. Based on the numerical results, design pressure of the pipe can be obtained and burn-through can be predicted. It can be concluded that the design pressure decreases with the increasing of heat input. RSF and design pressure of the pipe increase with the increasing of flow rate. There is a range in which the increase changes greatly. For in-service welding, the range should be considered adequately to determine operating condition optimally. RSF increases with the increasing of pipe wall thickness. While the thickness increases to an extent, RSF shows little increase. Accord- ing to the curves of design pressure versus different parameters, safe working pressure can be achieved. | XUE Xiaolong1, ZHU Jiagui2 & SANG Zhifu1 1. College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China 2. Nanjing Yangzi Petrochemical Maintenance and Installation Co. Ltd., Nanjing 210048, China | 2006 | Science China(Technological Sciences)2006，49，4： | 2 |
| 4 | Effect of Welding Paramenter on Joint Property of Aluminum Matrix Composite in Liquid-Phase-Impacting Diffusion Welding显示文摘In this paper, a new method for welding SiCp/101A was put forward. It is LPI (liquid-phase-impacting) diffusionwelding. Through LPI diffusion welding SiCp/101A aluminum, the effect of welding parameters on the weldedjoint property was investigated, and the optimal welding parameters were brought forward at the same time. Themicrostructure of joint was analyzed by means of optical-microscope, scanning electron microscope in order to studythe relationship between the macro-properties of joint and the microstructure. The results show that LPI diffusionwelding could be used for welding aluminum matrix composites SiCp/101A successfully. | Wei GUO Qingchang MENG Jitai NIU Xinmei ZHANG | 2003 | Journal of Materials Science & Technology2003，19，z1： | 2 |
| 5 | PRESS FORMABILITY OF YAG LASER WELDED TRIP STEEL SHEETS显示文摘The effects of YAG laser welding conditions on mechanical properties and pressformability (bendability, stretch-formability and deep drawability) of high-strengthtransformation-induced plasticity-aided dual-phase (TDP) steel were investigated.Tensile tests and press forming tests have been conducted for laser butt welded jointsbetween two pieces of the same steel. The tensile property and press formability wereaffected by the welding speed of 100 to 1100mm/min and the energy of 6 to 9J/pulse.Excellent press formability was obtained with the energy of 6J/pulse and the weldingspeed of 300mm/min. It was concluded that the excellent weldability of the TDP steelcan be ascribed to the weld joint formation. | A. Nagasaka | 2002 | Acta Metallurgica Sinica(English Letters)2002，15，1： | 1 |
| 6 | Numerical Analysis of Energy Effect in Laser-TIG Hybrid Welding显示文摘The hybrid source that combined CO2 laser with TIG arc to proceed welding was analyzed. Based on an energymodel, the temperature field and weld shape were calculated numerically. The heat transfer characteristic of thehybrid heat source to workpiece and its effect to weld shape were also analyzed. Through analyzing the enhancementeffect of the hybrid heat source, the absorption effect and defocusing effect of the hybrid arc to laser were calculated,and the regularity of the energy density to the current was obtained subsequently. At last, the critical energy matchesto induce the enhancement effect of CO2 laser-TIG arc hybrid welding were obtained. | Yanbin CHEN Liqun LI Junfei FANG Xiaosong FENG | 2003 | Journal of Materials Science & Technology2003，19，z1： | 1 |
| 7 | Liquid-Phase-Impacting Diffusion Welding Mechanism and Microstructure of Welded Joint of Al Matrix Composite SiCp/101A显示文摘The liquid-phase-impacting (LPI) diffusion welding mechanism and microstructure of welded joint of aluminum matrixcomposite SiCp/101A have been studied. It shows that by LPl diffusion welding, the interface state between SiCparticle and matrix is prominent, the harmful microstructure or brittle phase can be restrained from the welded joint.Moreover, the density of dislocation in the matrix near the interface and in the matrix are all so higher than that ofparent composite, the dislocation entwists each other intensively resulted in welding the composite successfully. | Jitai NIU Wei GUO Qingchang MENG Xinmei ZHANG Xingqiu LIU Guangtao ZHOU | 2003 | Journal of Materials Science & Technology2003，19，z1： | 1 |
| 8 | Ultrafast shape change and joining of small-volume materials using nanoscale electrical discharge显示文摘Using nanoscale electrical-discharge-induced rapid Joule heating, we developed a method for ultrafast shape change and joining of small-volume materials. Shape change is dominated by surface-tension-driven convection in the transient liquid melt, giving an extremely high strain rate of N106 s-1. In addition, the heat can be dissipated in small volumes within a few microseconds through thermal conduction, quenching the melt back to the solid state with cooling rates up to 108 K.s-1. We demonstrate that this approach can be utilized for the ultrafast welding of small-volume crystalline Mo (a refractory metal) and amorphous Cu49Zr51 without introducing obvious microstructural changes, distinguishing the process from bulk welding. | Cheng-Cai Wang Qing-Jie Li Liang Chen Yong-Hong Cheng Jun Sun ZhioWei Shan Ju Li Evan Ma | 2015 | Nano Research2015，8，7： | 0 |
| 9 | Effect of Gravity on Arc Shape in GTA Welding-for Low Electric Arc Current显示文摘Gas tungsten arc (GTA) welding was performed both in a microgravity environment and in a terrestrial environment,and the arc shapes in both environments were compared. A microgravity condition was obtained using the free fallsystem at the Japan Microgravity Center. The system can maintain a 10 s microgravity of less than 10-5 g. Awater-cooled Cu plate was used to simplify the arc phenomenon. The electric arc current was between 15 and 80 A,and the shielding and atmospheric gas was 99.9995% Ar and its flowing rate was 10 l/min. The polarity was a directcurrent electrode negative (DCEN). The arc gap was 3 mm and careful attention was also paid to the arc gap in boththe terrestrial and microgravity environments being the same. As a result, it was found that no effect of gravity onthe arc shape is observed under general welding conditions (over 60 A). When the electric arc current is lower than25 A, the arc shape is determined by the initial position of the arc root and is constant with time. Accordingly, itcan not be judged whether or not the arc shape is affected by gravity for this range. When the electric arc current isbetween 25 A and 60 A, it is estimated that the arc shape is not affected by gravity though it is occasionally affectedby other minor effects. | Hidetoshi FUJII Yosuke SUMI Manabu TANAKA Kiyoshi NOGI | 2003 | Journal of Materials Science & Technology2003，19，z1： | 0 |
| 10 | The structure and properties of laser seam stepper system (LSS) welded the low alloy high strength steel DOCOL 1200M with martensitic structure显示文摘This paper will present the influence of joining process parameters on the structure and properties of overlapped welded joints of 1.8 mm DOCOL 1200M steel.The obtained welded joints were subjected to micro- and macroscopic metallographic examination and hardness measurement.The visual inspections and non-destructive testing made it possible to develop the field of welding parameters to allow obtaining full penetration joints (depending on requirements) or partial penetration joints.For present welding parameters,i.e.feed rate and weld length,which are constant,the actual length of weld is determined by welding frequency.In each case,the microscopic examinations revealed martensitic structure in the weld area,and with the increase in linear welding energy the size of martensite needles became larger,especially in relation to the base material.In HAZ,the martensitic structure is tempered.It has been shown that with appropriately selected parameters the Laser SEAM Stepper method is suitable for welding the DOCOL 1200M steel.With the increase in welding power,the penetration depth increases. | Jacek Górka Andrzej Ozgowicz | 2018 | Materials Science(Advanced Composite Materials)2018，2，1： | 0 |
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