检索结果-南通市图书馆

STUDY ON THE PRESSURE IN plasma arc

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2003年第1期16卷 34-36页

作者： DaiDashan SongYonglun 等 DepartmentofMechatronicsEngineeringSouthChinaUniversityofTechnology Guangzhou510640China BejingUniversityofTechnology Bejing100044China

The axial pressure in plasma arc is measured under different conditions. Theeffects of the parameters, such as welding current, plasma gas flow rate, electrode setback and arclength, on the pressure in plasma arc are investigated and quantitative analyzed to explain therelationship between the quality of weld and the matching of parameters in plasma arc weldingprocess.

关键词： plasma arc Pressure Quality

A New Waste Disposal Technology-plasma arc Pyrolysis System

在线全文

学校读者我要写书评

暂无评论

plasma Science and Technology 2003年第2期5卷 1743-1748页

作者：施嘉标刘正之梁荣庆黄建军 Institute of plasma Physics Chinese Academy of Sciences

This paper introduces a new waste disposal technology with plasma arc. Being different from conventional combustion or burning such as incineration, it is based on a process called controlled pyrolysis-thermal destruction and recovery process. It has four advantages, they are completely safe, clean, high-energy synthesis gas, non-toxic vitrified slag and metal.

关键词： plasma arc pyrolysis incinerator

Numerical analysis of plasma arc behaviors

在线全文

学校读者我要写书评

暂无评论

China Welding 2013年第1期22卷 77-82页

作者：菅晓霞武传松 MOE Key Laboratory for Liquid-Solid Structural Evolution and Materials Processing and Institute of Materials Joining Shandong University Jinan 250061 Rongcheng College Harbin University of Science and Technology Rongcheng 264300.

Completely understanding the physical mechanisms of the plasma arc is critical to its application in welding of medium thickness plates. In this study, a mathematical model is developed to analyze the temperature, fluid flow, electromagnetic fields and pressure distribution in plasma arc welding. The correlations between the torch structure （ nozzle diameter） and the plasma are properties are analyzed qualitatively. The influence of the plasma gas flow rate on the plasma arc behavior is also simulated numerically. The temperature distribution and current density of the plasma are change greatly with a little variation of the nozzle diameter and^or the plasma gas flow rate. Compared to the tungsten-inert-gas arc with almost same conditions, the heat intensity, fluid velocity and pressure at the anode suoCace rise by one order of magnitude for a plasma arc. The analysis results lay solid foundation for effective usage ofplnsma arc welding.

关键词： plasma arc numerical analysis nozzle diameter plasma gas flow rate

Simulation research on heat-affected zone of the NiTi alloy plasma arc welded joints

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Welding 2009年第1期18卷 43-46页

作者：徐越兰张俊王飞 Department of Material Engineering Nanjing University of Science and Technology Nanjing210094

In order to study the compositions and properties of NiTi alloy plasma arc welded joints, different temperatures of the heat-affected zone（HAZ） are simulated. Temperatures are set at 20 ℃, 400 ℃, 500 ℃, 600 ℃, 700 ℃, 800 ℃, 900 ℃ and 1 000 ℃. X-ray diffraction results of the thermal simulated specimens show that NiTi2 phase emerges in the alloy when the temperature is between 500 ℃ and 800 ℃, while NiTi2 and Ni3 Ti phases emerge when the temperature is between 800 ℃ and 1 000 ℃. Tensile strengths of specimens at 600 ℃ and 900 ℃ are only 68. 0% and 61.3% of the strength at the room temperature respectively due to the emergence of NiTi2 and Ni3 Ti phases.

关键词： NiTi alloy plasma arc heat-affected zone

Effect of Ti-Si-Mg-Al wire on microstructure and mechanical properties of plasma arc in-situ welded joint of SiC_p/Al composites

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2012年第2期22卷 305-311页

作者：雷玉成薛厚禄胡文祥闫久春江苏大学材料科学与工程学院镇江212013 哈尔滨工业大学先进焊接与连接国家重点实验室哈尔滨150001

The influence of Ti-Si-Mg-AI wire on microstructure and mechanical properties of SiCp/A1 metal matrix composite joints produced by plasma arc in-situ weld-alloying was investigated. Argon-nitrogen mixture was used as plasma gas and Ti-Si-Mg-A1 flux-cored wires as filled composites. Weldments were submitted to tensile test. Meanwhile, the macro morphology and microstructure of the joints were examined. The result shows that the formation ofneedie-like harmful phase A14C3 is effectively inhibited and the wettability of molten pool is improved by adding Ti-Si-Mg-A1 flux-cored wires. With 15Ti-5Si-5Mg-A1 flux-cored wire as filled composite, the maximum tensile strength of the welded joint is 267 MPa, which is up to 83% that of the matrix composites under annealed condition.

关键词： plasma arc in-situ welding aluminium matrix composites Ti-Si-Mg-A1 flux-cored wire

plasma arc Surface Hardening Robot Technology

在线全文

学校读者我要写书评

暂无评论

厦门大学学报（自然科学版） 2002年第S1期41卷 171-页

作者： ZHAO Tie-jun 1,2,3, ZHAO Ming-yang 1, ZHAO Wen-zhen 2 (1.Shenyang Institute of Automation of the Chinese Academy of Sciences, Shenyang 110016, China 2. Shenyang University of Technology, Shenyang 110023, China 3.Graduate School of the Chinese Academy of Sciences, Beijing 100039, China)

In national economy and national defense, a lot of ma chine components become worthless early because of wear and tear and corrode. It leads to huge loss of resource and material. Surface hardening of the steel cou ld form a hard, wearable, corrode-resisting layer on the surface to enhance the mechanical property of the machine component. From 1980s, there is a new method of surface hardening that is heating with plasma arc. It overcomes the shortage of old methods and is adopted in automotive product industry. The plasma equipm ent is small and easy to be controlled, so it could be installed on a robot and moved everywhere. This paper analyzed the character of the plasma at first, then studied the plasm a arc as Guess distribution circular heat source to create the surface hardening temperature field and heating process. The method of the plasma arc surface har dening technology is given. This paper describes hardware design of the plasma arc surface-hardening robot and analyzes its kinematics. This robot is a humanoid form robot with a mobile p latform, a 7 DOF redundancy arm and a 2 DOF trunk. The footprint is an important feature for the robot that has to move in a cluttered environment. Thus the mob ile platform of the plasma arc robot is an omni-directional mobile robot with o rthogonal-wheel assemblies. The trunk is important for keep balance of the robo t. Thus a series spring is fixed in the trunk to provide accurate force feedback at each direction and insulate the shock loads from arm and mobile platform. Th e redundancy arm configuration is similar to a broadly simplified model of the h uman arm with 7 DOF. The maximum radius is about 1 m with a maximum load of abou t 1 kg. The redundancy of the 7 DOF allows the handling of situation in whic h additional movement constraints have to meet and avoids static or dynamic obst acles. It has better adaptation to typical human environment and to allow for hu man-like behavioral strategies in solving complex task

关键词： plasma arc surface hardening robot

DESIGN OF REMANUFACTURING RAPID FORMING SYSTEM BASED ON 3D plasma arc WELDING

在线全文

学校读者我要写书评

暂无评论

DESIGN OF REMANUFACTURING RAPID FORMING SYSTEM BASED ON 3D P...

DC arc plasma Disposal of Printed Circuit Board

第四届世界维修大会

作者： Yong-Hua Xiang Yao-Hui Lv Bin-Shi Xu Yi Jiang Dan Xia Lun-long Liu Equipment Maintenance Surface Engineering Research Center BeiJing 100072

As one of key technology of remanufacturing, remanufacturing core rapid forming technology is a hot spot and important developmental direction in today’s remanufacturing research field. 3D welding with plasma arc is a way for manufacturing/remanufacturing of metallic parts. In this paper, on the base of principle of Remanufacturing Directly Metal Forming（RDMF）, the overall structure and characteristic of the system was introduced and implementation of hardware and software was specified with the development of RDMF system.

关键词： Remanufacturing plasma arc Three dimensional welding Directly metal forming.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

plasma Science and Technology 2004年第4期6卷 2423-2426页

作者：黄建军施嘉标孟月东刘正之 Institute of plasma Physics of Chinese Academy Sciences Hefei 230031China Department of Applied PhysicsSchool of Science of Shenzhen UniversityShenzhen 518060 China Institute of plasma Physics of Chinese Academy Sciences Hefei 230031China Institute of plasma Physics of Chinese Academy Sciences Hefei 230031China new solid waste disposal technology setup with DC are plasma is presented. Being different from conventional combustion or burning such as incineration it is based on a process called controlled high-temperature pyrolysis the thermal destruction and recovery process. The results of vitrification of the circuit board is presented. The properties of vitrified product including hardness and leaching test results are presented. The final product (vitrified material) and air emission from the plasma treatment is environmentally acceptable.

A new solid waste disposal technology setup with DC are plasma is presented. Being different from conventional combustion or burning such as incineration, it is based on a process called controlled high-temperature pyrolysis, the thermal destruction and recovery process. The results of vitrification of the circuit board is presented. The properties of vitrified product including hardness and leaching test results are presented. The final product (vitrified material) and air emission from the plasma treatment is environmentally acceptable.

关键词： plasma arc pyrolysis vitrification non-leachable slag

Surface treatment of 0Cr19Ni9 stainless steel SMAW joint by plasma melting

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University Science 2002年第3期3卷 272-277页

作者：罗伟栾景飞严密 CollegeofMaterialsandChemicalEngineering ghejiangUniversityHangzhou310027China

Micro plasma arc surface melting of 0Cr19Ni9 shielded metal arc welding joint with a micro plasma arc welder produced a thin surface melted layer with a refined microstructure. The surface treatment changed the anodic polarization behavior in 0.5 mol/L H 2SO 4 solution. The polarization tests showed that for the as welded joint both the heat affected zone and the weld metal decreased in resistance to corrosion compared with the as received parent material while for the micro plasma arc surface melted joint the corrosion resistance increased significantly. This increase in corrosion resistance is attributed to the rapid solidification of the melted layer. Rapid solidification of the melted layer refines its microstructure, decreases its microsegregation, and inhibits the precipitation of chromium carbides at the grain boundaries.

关键词： Surface melting Stainless steels plasma arc Welding joint