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Influence of laser energy input mode on joint interface characteristics in laser brazing with Cu-base filler metal

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中国有色金属学会会刊：英文版 2008年第5期18卷 1065-1070页

作者：李俐群封小松陈彦宾 State Key laboratory of Advanced welding Production Technology Harbin Institute of Technology

The flange butt joints of 1 mm-thick galvanized steel sheets were brazed with CuSi3 as filler metal at different laser heating *** microstructures and element distributions of joint interface were investigated by SEM and *** results show that there is no obvious interface layer with the circular individual beam heating and lamellar Fe-Si intermetallic compound layer is found with dual-beam laser spot *** the irradiation of rectangular laser spot,the joint interface layer is also *** layer thickness is larger than that of dual-beam brazing and the layer shape is flat so that intermetallic compounds trend to grow into cellular ***,the interface layer shape also depends on its position in the *** the high heat input,dendritic or granular intermetallic compounds dispersively distribute in brazing seam adjacent to the interface,which is caused by the melting or dissolving of the base *** to the results,the brazing quality can be controlled by laser heating mode and processing parameters.

关键词：激光铜焊法接口特征激光能量输入模式焊接技术镀锌钢

Joint performance of laser-TIG double-side welded 5A06 aluminum alloy

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中国有色金属学会会刊：英文版 2009年第1期19卷 26-31页

作者：陈彦宾苗玉刚李俐群吴林 State Key laboratory of Advanced welding Production Technology Harbin Institute of Technology

The influence of welding parameters on mechanical properties and microstructure of the welds of laser-TIG double-side welded 5A06 aluminum alloy was investigated. The results show that the weld cross-sectional shape has an intimate relation with the mechanical properties and microstructure of the welds. The symmetrical "X" cross-section possesses a relatively higher tensile strength and elongation than the others, about 91% and 58% of those of base metal, respectively. The good weld profiles and free defects are responsible for the improvement of tensile properties. Due to low hardness of the fusion zone, this region is the weakest area in the tensile test and much easier to fracture. The loss of Mg element is responsible for the decrease of mechanical properties of the joints. The microstructure of "X" cross-section has an obvious difference along the direction of weld depth, and that of the "H" cross-section is consistent and coarse.

关键词：铝合金激光电弧双面焊接术特征分析

Computational analysis of linear friction welding process and micromechanical modeling of deformation behavior for medium carbon steel

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Journal of Central South University 2015年第9期22卷 3275-3281页

作者：杨夏炜李文亚马铁军 State Key laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding Technologies Northwestern Polytechnical University

Finite element simulation of linear friction welding(LFW) medium carbon steel was carried out using the ABAQUS software. A two-dimensional(2D) coupled thermo-mechanical model was established. First, the temperature fields of medium carbon steel during LFW process were investigated. And then, the Mises stress and the 1st, 2nd and 3rd principal stresses fields' evolution of the steel during LFW process were studied. The deformation behavior of LFW carbon steel was analyzed by using micromechanics model based on ABAQUS with Python code. The Lode parameter was expressed using the Mohr stress circle and it was investigated in detail.

关键词： linear friction welding finite element method deformation behavior micromechanics model

Microstructural zones and tensile characteristics of friction stir welded joint of TC4 titanium alloy

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Transactions of Nonferrous Metals Society of China 2010年第10期20卷 1873-1878页

作者：刘会杰周利 State Key laboratory of Advanced welding Production Technology Harbin Institute of Technology

TC4 titanium alloy was friction stir welded using a W-Re pin tool,and the defect-free weld was produced with proper welding *** joint consists of stir zone,heat affected zone and base *** stir zone is characterized by equiaxed dynamically recrystallized α phases and transformed β phases with fine α+β lamellar *** microstructure of the heat-affected zone is similar to that of the base material,but there is an increase in the volume fraction of β.Transverse tensile strength of the joint is 92% that of the base material,and the joint is fractured in the stir zone and the fracture surface possesses typical plastic fracture *** stir zone is the weakest part of the joint,through which the tensile characteristics of the TC4 joint can be explained.

关键词： friction stir welding titanium alloy microstructural zones tensile characteristics

Radial Distribution Characteristics of Microstructure and Mechanical Properties of Ti–6Al–4V Butt Joint by Rotary Friction welding

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Acta Metallurgica Sinica(English Letters) 2015年第10期28卷 1291-1298页

作者： Hai-Yan Chen Li Fu Wen-Yuan Zhang Fen-Jun Liu State Key laboratory of Solidification Processing Northwestern Polytechnical University Shaanxi Key laboratory of Friction welding Technologies

Ti-6Al-4V rods were butt-welded by rotary friction welding in this study. Additionally, the radial differences in microstructure and mechanical property of joints were investigated by hierarchy slicing method. The results displayed that the width of weld zone and heat-affected zone of joints became wider along radial direction. Meanwhile, the tensile strength of joints decreased gradually along the radial direction. According to the theoretical analysis, the temperature gradient and inhomogeneous forging pressure leaded to the radial differences. Through K-type thermocouples, the actual temperatures at different locations were measured, and the results were consistent with the theoretical analysis. Theoretically, the radial differences of rotary friction welding joint are an inherent phenomenon; thus, the size of weldment should be limited strictly below the corresponding critical size. In order to prevent radial differences from enlarging, the welding surface profile of weldment can be processed into oval shape, and a larger forging pressure can be used within the scope of the joint deformation allowed according to causes for radial differences.

关键词： Titanium alloys Friction welding Microstructure Mechanical property

Control of Titanium Alloy Thin Plate welding Distortion by Trailing Peening

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Journal of Materials Science & Technology 2003年第z1期19卷 184-186页

作者： Xuesong LIU Hongyuan FANG Shude JI Zhibo DONG State Key laboratory of Advanced welding Production Technology Harbin Institute of TechnologyHarbin 150001 China State Key Laboratory of Advanced Welding Production Technology Harbin Institute of TechnologyHarbin 150001 China State Key Laboratory of Advanced Welding Production Technology Harbin Institute of TechnologyHarbin 150001 China State Key Laboratory of Advanced Welding Production Technology Harbin Institute of TechnologyHarbin 150001 China

The technology of trailing peening is a kind of promisingly bran-new technology which can be used to control weldingstress and distortion of Ti alloy thin plate. Control of TC4 Ti alloy thn plate welding stress and distortion underthe condition of conventional welding and trailing peening is performed, respectively. The results show that thetechnology of trailing peening effectively reduces deflection and transverse shrinkage of thin plate weldment. Themaximum deflection is decreased from 15 mm under the conditior of conventional welding to 5 mm, while the weldtransverse shrinkage is decreased from 0.5 mm to about 0.1 mm.

关键词： Control of residual stress and distortion, Trailing peening, TC4 Ti alloy

Influence of welding parameters on interface evolution and mechanical properties of FSW Al/Ti lap joints

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Journal of Materials Science & Technology 2019年第8期35卷 1543-1554页

作者： Mingrun Yu Hongyun Zhao Zhihua Jiang Zili Zhang Fei Xu Li Zhou Xiaoguo Song State Key laboratory of Advanced welding and Joining Harbin Institute of TechnologyHarbin 150001 China Shandong Provincial Key laboratory of Special welding Technology Harbin Institute of Technology at WeihaiWeihai 264209 China

Friction stir welding(FSW)was performed to produce Al/Ti lap joints under various welding *** heat was generated when rotational rate increased or traversing rate *** types of Al/Ti interfaces–mixed interface and diffusive interface–were formed under different welding *** diffusive interface was formed with low heat input,and the mixed interface was formed more *** grains at the mixed interface were larger than those at the diffusive interface because of the higher heat ***,the microstructure of the mixed interface had a lower texture intensity compared with that of the diffusive interface,which was attributed to the enhanced continuous dynamic recrystallization(CDRX).TiAl3 was formed at the diffusive *** the interface varied to the mixed interface as heat input increased,TiAl was fomed within the Al/Ti mixture following the formation of *** addition,TiAl3 precipitates were observed in the diffusion *** hardness value of the mixed interface was higher than 350 HV,due to the larger amount of intermetallic compounds(IMCs).The lap shear strength reached a maximum value of 147 MPa with medium heat input and an interface that exits in a critical state between diffusive and mixed *** the specimens fractured at the interface,which was attributed to the presence of IMCs.

关键词： FSW Al/Ti lap joint Interfacial characteristics Mechanical properties

Simulation on Magnetostriction Strain of Polymer-bonded Terfenol-D Composites

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Journal of Materials Science & Technology 2003年第z1期19卷 103-104页

作者： Jiuchun YAN Shixiong LU Shiqin YANG Shiyu HE State Key laboratory of Advanced welding Production Technology Hanbin Institute of Technology Harbin 150001 China State Key Laboratory of Advanced Welding Production Technology Hanbin Institute of Technology Harbin 150001 China State Key Laboratory of Advanced Welding Production Technology Hanbin Institute of Technology Harbin 150001 China State Key Laboratory of Advanced Welding Production Technology Hanbin Institute of Technology Harbin 150001 China

A model of magnetostrictive strain for polymer-bonded Terfenol-D composite is presented, which is composed of asubmodel for the average strain of Terfenol-D composite and a magnetostriction submodel for Terfenol-D *** results show that the saturation magnetostriction λs is very closely with experimental results, althoughthere exists some difference between the calculated and the experimental results under low applied magnetic *** saturation magnetostriction of the composites increases with the particle fraction (v1=72.5～90 vol. Pct) in thesimulated and experimental results, but the simulation result is not ideal when the particle fraction is higher than 85%.

关键词： Polymer-bonded Terfenol-D composite, Magnetostriction, Simulation

Simulation on Thermal Integrity of the Fin/Tube Brazed Joint of Heat Exchangers

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Journal of Materials Science & Technology 2003年第z1期19卷 71-72页

作者： Yiyu QIAN Feng GAO Fengjiang WANG Hui ZHAO State Key laboratory of Advanced welding Production Technology Harbin Institute of Technology Harbin 150001 China State Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001 China State Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001 China State Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001 China

In the applications of heat exchangers, the fin efficiency of heat transfer is the key issue. Thermal distribution withinthe brazed joints in heat exchanger under loading conditions is investigated in this paper. Simulated results showedthat the thermal distribution at the brazed joint zone is related to not only the geometry of the fin and tube, butalso the brazed joint topology. A poor brazed joint will result in very poor heat transfer. Thermal contact resistanceis adopted to analyze the fin heat efficiency.

关键词： Thermal integrity, Fin efficiency, Thermal contact resistance, FEM