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EFFECT OF Fe_2O_3 ON welding technology AND MECHANICAL PROPERTIES OF WELD METAL DEPOSITED BY SELF-SHIELDED FLUX CORED WIRE

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Chinese Journal of Mechanical Engineering 2005年第1期18卷 55-57页

作者： YuPing PanChuan XueJin LiZhengbang DepartmentofweldingResearch CentralIronandSteelResearchInstituteBeijing100081China SchoolofMaterialsScienceandEngineering Xi＇anjiaotongUniversityXi＇an710049China DepartmentofMetallurgicaltechnology CentralIronandSteelResearchInstituteBeijing100081China

Five experimental self-shielded flux cored wires are fabricated withdifferent amount of Fe_2O_3 in the flux. The effect of Fe_2O_3 on welding technology and mechanicalproperties of weld metals deposited by these wires are studied. The results show that with theincrease of Fe_2O_3 in the mix, the melting point of the pretreated mix is increased. LiBaF_3 andBaFe_(12)O_(19), which are very low in inherent moisture, are formed after the pretreatment. Themechanical properties are evaluated to the weld metals. The low temperature notch toughness of theweld metals is increased linearly with the Fe_2O_3 content in the flux due to the balance betweenFe_2O_3 and residual Al in the weld metal. The optimum Fe_2O_3 content in flux is 2.5 percent approx3.5 percent.

关键词： Self-shielded flux arc welding Fe_2O_3 welding technology Mechanicalproperties

Achievements and developing trend of welding technology in Chinese shipbuilding

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China welding 1996年第2期5卷 81-88页

作者： ZHOU Guosheng and WU Jing(Science and technology Bureau of CSSC,Beijing.100861)(technology Research & Economy Development Institute, China State Shipbuilding Corporation.)

China's shipbuilding welding industry has passed a history of 40 years,and the rapid progresses in high efficient and automatic welding technology taken place in the recent 10 years, have made significant contribution to the development of national shipbuilding industry as well as to the state key projects, which promotes the welding consumables and equipment industry in *** article presents the new welding technologices used in Chinese shipbuilding industry,particularly in recent decade,including new welding consumables and equipment,and economical benfit, caused by these new technologies,and predicts foe welding technology developing trend for Chinese shipbuilding industry in authors'opinion.

关键词： shipbuilding welding technology

Repair welding of Casting Magnesium Alloys:A Review

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上海航天（中英文） 2022年第1期39卷 15-30页

作者： WU Guohua TONG Xin WANG Qiman ZHANG Guoqing XIAO Lü National Engineering Research Center of Light Alloys Net Forming and State Key Laboratory of Metal Matrix Composite Shanghai Jiao Tong UniversityShanghai 200030China Shanghai Aerospace Precision Machinery Institute Shanghai 201600China

Magnesium (Mg) alloys have broad application prospects in the fields of aerospace,national defense,and military industries,owing to their advantages of high specific strength and stiffness,good damping properties,and excellent castabilities. However,defects such as oxidation inclusions,shrinkage cavities and porosities,and hot cracks are readily generated in Mg alloy components,which seriously reduce the performance stability of the products. Related repair welding technologies for Mg alloys can greatly reduce the rejection rate and production cost,and exhibit significant value in scientific research and engineering application. In this review,the weldability of Mg alloys is introduced firstly according to their physical and chemical properties. Then,various repair welding technologies and pre-weld treatments applicable to Mg alloys are systematically summarized,and the effects of welding parameters as well as heat treatments on the microstructure and performance of the repaired joints are clarified. Finally,the existing problems and development trends of repair welding technologies for Mg alloys are summarized based on the actual engineering application requirements.

关键词： Mg alloy repairing welding technology defect heat treatment

Study of microstructures and properties for girth weldingof domestic X70 pipeline steels

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China welding 2008年第2期17卷 63-66页

作者：李云涛杜则裕陶勇寅熊林玉 School of Materials Science and Engineering Tianjin University of Technology School of Materials Science and Engineering Tianjin University Pipeline Research Institute of CNPC

With the development of domestic pipeline steels, it is necessary to develop suitable welding technology which can improve the properties of the welded pipeline. In this paper, the microstructures and mechanical properties of domestic XTO pipeline steels and welded joints are discussed. The welding consumables of BOHLER E6010 and HOBART 81N1 are matched for girth welding. The following characteristics in heat-affected zone（ HAZ） are indicated that microstructures of intercritical HAZ（ ICHAZ） is finer and more uniform, the grain sizes of fine-grain HAZ （ FGHAZ） and subcritical HAZ （ SCHAZ） are smaller than that of coarse-grain HAZ（ CGHAZ）. The hardness, tensile strength and toughness of welded joints come up to the standard. The micrographs of impact specimens in welded joints are cleavage, quasi-cleavage and dimple which shows there is typical ductile rupture.

关键词： domestic X70 pipeline steels welding technology welded joints microstructures properties

MANUFACTURE technology OF NODAL POINT OF TELEVISION TOWER OF JINAN CITY

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MANUFACTURE TECHNOLOGY OF NODAL POINT OF TELEVISION TOWER OF...