电热壶发热盘电阻焊接机构设计

(广东工贸职业技术学院,广东 广州 510510)

电热壶发热盘电阻焊接机构设计

孙涛王亚芳

(广东工贸职业技术学院,广东 广州 510510)

针对电热壶中发热盘和总钉的焊接，设计了自动化电阻焊接设备。主要包括发热盘上料机构、总钉上料机构、两者的组装夹紧机构以及电阻焊接机构。人工将发热盘及总钉批量上料到各自的上料料斗内，上料机构自动抓取单个物料，并且自动组装，经过焊接夹具进行定位夹紧，输送到焊接工位，电阻焊接机自动完成焊接。实际生产验证结果表明，该机构实现自动化生产，可节约3个人力。

发热盘总钉电阻焊自动化

0 序 言

不锈钢电热壶是人们常见的生活用品，随着人们生活水平的不断提高，对高质量的电热壶需求越来越大[1-3]。电热壶的发热盘和总钉的焊接质量直接影响到产品的品质，传统的焊接方式为手工氩弧焊，效率低下，焊接质量不高，已经不能满足企业的生产需求。

电阻焊接不锈钢电热壶具有一定优势，具有成本低廉、实用范围广泛及使用方便等优点，已经在金属连接方面得到广泛应用[4-6]。目前大部分电阻焊接工序采用人工上料方式，电阻焊机作为单一工作台运行，效率低下，且焊接品质难以保证。自动化生产是生产企业技术升级的必经之路，但是全自动化生产线一般成本较高，对于传统五金生产企业难以承受，必须对每个工序进行合理设计，在尽量较少人工消耗的同时提高自动化程度，并且保证产品质量[7-10]。

文中结合产品结构及要求，设计自动上料机构，将电热壶的发热盘部件经过焊接连接，节约人力成本。

1 焊接产品及设备总体设计

1.1 焊接产品

待焊产品为一发热盘和总钉，发热盘材质为不锈钢SUS304，尺寸为φ120 mm×1.2 mm，激光切割成型，精度较高；总钉材质为不锈钢，最大外观尺寸φ6.5 mm×34 mm，为精密铸造件,需将二者焊接在一起，产品结构如图1所示，焊接完成后需在加热情况下对其进行拉力和强度检测。

图1 焊接产品图

1.2 设备总体设计

设备主要由发热盘上料组件、总钉上料组件、焊接机组件、夹具组件、机柜以及相应机加件等组成,如图2所示。

设备工作时，人工将物料分别投入到总钉上料组件和发热盘上料组件中，一次投料可满足大约4 h生产所需，设备无料时停止工作并声光报警，提示进行人工上料；此后设备自动运行完成焊接；焊接完成后自动下料。

图2 设备总体视图

2 自动化机构设计

2.1 发热盘上料组件设计

发热盘上料组件主要由线性滑轨、气缸、定位夹具、电动推杆以及对应机加件组成，如图3a所示。其中，定位夹具固定在由线性滑轨组成的直线运动副上，大行程气缸通过浮动接头和定位夹具连接在一起，这样定位夹具可看成一个双工位机构。当一个工位内的发热盘用完后，气缸开始动作，可使其切换到另一个工位,如图3b所示。电动推杆安装在定位夹具正下方，设备工作时，人工将大批次(两个工位共约600片)的发热盘一次性放入到定位夹具内，每次取走一个发热盘(真空发生器驱动真空吸盘吸附)，电动推杆往上运动一个发热盘厚度的距离；定位夹具主要由几根光轴和底下的定位板组成(定位板和线性滑轨的滑块固定在一起)。

电动推杆是一种将电动机的旋转运动转变为推杆的直线往复运动的电力驱动装置，结构如图3c所示。

2.2 总钉上料组件设计

总钉上料组件主要由振动盘、尼龙管、分料组件以及对应机加件等组成，如图4a所示。设备工作时，人工将一定数量的总钉一次性投入到振动盘内，此后经由尼龙管流入到分料组件内其中分料组件和气缸1固定在一起，此后气缸2和气缸3二者共同作用将总钉逐个分离出来，气缸2和气缸3的动作顺序正好相反，为方便控制，气缸2和气缸3的排气可共用一个电磁阀。被分离出来的总钉，会经过储料嘴，此时出料嘴附近的光电对射传感器可对其进行检测(检测总钉是否被取走)，分料机构的放大图分别如图4b～4d所示。

此后，被分离出的总钉会被其他工位的机构取走流入下一道工序，继续进行生产。

2.3 夹具组件设计

夹具组件为此设备核心功能组件，可实现总钉的转移、组装定位、焊接和下料等功能。

图3 发热盘上料组件机构图

图4 总钉上料组件机构图

夹具组件如图5所示，主要由发热盘抓取机构、总钉夹持机构、移载机构、(发热盘)定位机构1、(发热盘)定位机构2、固定夹具、下料机构和焊接机构等组成。其中，总钉夹紧机构、发热盘抓取机构和发热盘定位夹紧机构均固定在移载机构上，移载机构为步进式机构。移载机构可在Z轴和X轴方向运动，动力均有气缸提供，方便控制。设备工作时，发热盘抓取机构抓取一个发热盘，此后移载机构开始带着被抓取的发热盘往上运动；此时总钉上料组件内的气缸1往下运动，气缸2和气缸3联动并分离出一个总钉，此后总钉夹持机构将总钉夹紧，总钉上料组件内气缸1缩回；于此同时，发热盘定位夹紧机构将前面已经焊接完成的发热盘(前一工位焊接的成品)举起；此后移载机构带着上料完成的发热盘和总钉以及焊接完成的发热盘(前一工位焊接的成品)往右运动，此时可将总钉带到焊接组件正下方，可将发热盘放到发热盘定位机构1中，可将定位机构2内的焊接成品送入到下料机构内。其中，固定夹具作为一个中转机构，移载机构在运动时，固定夹具全程都为固定状态。

图5 夹具组件机构图

因为移载机构为往复式步进机构，故每一个总钉和发热盘焊接的工序相同且重复，各机构动作如上文所述。

2.4 发热盘抓取机构设计

发热盘抓取机构主要由一个固定板和4个真空吸盘组成。如图6所示，四个真空吸盘固定在固定板上，其中固定板为钣金件。

发热盘抓取机构固定在移载机构上，抓取发热盘时，移载机构通过上下运动使真空吸盘接触到发热盘即可实现抓取，为使更好地抓取发热盘，真空吸盘采用风琴式吸盘。

2.5 固定夹具设计

固定夹具为固定状态，不随移载机构运动，托板固定在固定块上，固定块固定在底板上，移载机构也固定在底板上，如图7所示。

图6 发热盘抓取机构图

图7 固定夹具机构图

2.6 总钉夹持机构设计

由总钉上料机构内被分离出的总钉流出总钉上料机构后，被总钉夹持机构内的气爪夹持住，气爪为180°开闭形，夹持总钉的一对夹爪各自开有V形槽，能够很好地将总钉夹持住，如图8所示。当完成一个总钉的上料(被夹持住)以后，总钉上料机构内的气缸1则带着整个机构往上退位。其中，气爪固定在悬臂上，悬臂固定在移载机构上。

图8 总钉夹持机构图

2.7 定位机构设计

定位机构起到对发热盘的定位和夹紧作用，如图9所示，被移载机构和发热盘抓取机构取过来的发热盘被放入到定位机构内以后，气缸开始带着定位块往中间移动，实现对发热盘的固定。

图9 定位机构图

2.8 移载机构与焊接机构设计

移载机构可在X轴和Z轴方向运动。Z轴方向主要由两个气缸1和两组直线运动副1(直线轴承+导向轴)组成；X轴主要由一个气缸2和两组直线运动副2(线性滑轨)组成，结构如图10所示。

图10 移载机构图

焊接机构主要由一电阻焊机、气缸、电极头、嵌套以及相应机加件组成，焊机机构如图11所示。

图11 焊接机构图

设备运行时，总钉每次上料完成后(即被总钉夹紧机构夹持住)，移载机构就带这总钉往右运动一个工位，此时总钉运动到焊接机构正下方，此后气缸开始往下运动，这样嵌套可将总钉完全包进去，然后和嵌套相连的真空发生器开始动作，将总钉吸附在嵌套内，此后总钉夹紧机构内的气爪松开。此后当步进机构返回后，气缸则带着装有总钉的嵌套往下运动，此后总钉会和发热盘接触，然后开始焊接。其中，嵌套和电极头均采用红铜，气缸由电气比例阀控制其气压，可以达到间接控制其压力的目的。

3 结 论

(1)采用手动对材料进行批量上料，然后通过自动化机构完成物料的单个上料、组装、定位夹紧及自动焊接，极大提升了自动化程度。

(2)自动化设备结构整体简单实用，成本较低，适合批量化生产。

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MicrostructureandmechanicalpropertiesofCu/Sn-58Bi-xEr2O3/Cubrazedjoint

Shi Xiaolong1, Yang Li2, Zhang Yaocheng2, Wang Guoqiang1, Zhou Shiyuan1

(1. School of Mechanical and Electrical Engineering, Soochow University, Suzhou 215000, Jiangsu, China; 2. School of Automobile Engineering, Changshu Institute of Technology, Changshu 215500, Jiangsu, China).p7-9

AbstractThe effect of minute nano-Er2O3particles on the wettability, microstructure and mechanical properties of Sn-58Bi solder was investigated. The results revealed that the microstructure of the solder is refined, the spreadability and mechanical properties of the composite solder are also improved with the addition of nano-Er2O3particles. When the addition of nano-Er2O3particles is 0.075wt.%, the best spreading performance can be obtained and its spreading coefficient increases by 5.1% compared with plain Sn-58Bi solder. In addition, when the addition of nano-Er2O3particles is 0.05wt.%, the microstructure of the solder is refined and the maximum tensile strength of the composite solder is 89 MPa, whose tensile strength increases by 11% compared with the plain Sn-58Bi solder.

Keywords：Sn-58Bisolder,nano-Er2O3particles,brazedjoint,microstructure,mechanicalproperties

Self-sharpeningandservicelifeoftoolwithasingle-sidebrazedcoating

Ma Bojiang, Bu Fanning, Yang Guanglei, Cao Tongkun

(College of Electromechanical Engineering, Qingdao University of Science & Technology, Qingdao 266061, Shandong, China).p10-13

AbstractTools such as agricultural grass cutter, stubble blade, soymilk blade and grain crushing knife would get passivated gradually during using and could not self-sharpen. In order to resolve these problems, the mixed Ni-based alloy and WC powder was brazed on the 65Mn steel surface to make the single-sided coating of tool. To ensure that the single-sided coating tool can self-sharpen, different heat treatments were used to change the matrix microstructure and regulate the both sides wear resistance of the tool. After 100-hours-grinding tests, the edge curvatures of the samples treated by normalization, quenching and tempering are 500 μm, 120 μm, 147 μm, respectively. The tool after 400 ℃ tempering has excellent wear resistance, self-sharpening, so it can significantly improve the service life of the tool.

Keywords：tungstencarbide,single-sidebrazedcoating,self-sharpening,servicelife

Researchandapplicationstatusofextrusionofbrazingfillermetals

Long Fei，He Peng，Lin Tiesong，Geng Huiyuan

(State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China).p14-16,42

AbstractThe equipment function, mold performance and process factors (speed, temperature, deformation index and mold shape) which affect the hot extrusion of brazing filler metals were analyzed from the hot extrusion research and application of brazing filler metals. Combined with the actual production of the extrusion equipment, the classic extrusion process and the main form of mold failure and its causes, a number of technical measures were put forward to improve the service life of extrusion mold, stabilize product quality and production efficiency. The technical approach to improve the quality and efficiency of hot extrusion of brazing filler metals was discussed. The investigation found that the excellent equipment, suitable technology and reasonable mold design are the fundamental guarantee for the smooth extrusion. Mold materials, mold manufacturing process and the use of the system determine the stability of the use of the mold.

Keywords：brazingfillermetals,hotextrusionmold,servicelife

Comparisonofresidualstressdeterminationmethodsforlaserlapweldingofstainlesssteelsheet

Li Shuhu1, Jiang Yunlu2, Chen Huaining2, Liang Hang2, Zhao Ruirong1

(1. CRRC Qingdao Sifang Co., Ltd, Qingdao 266111, Shandong, China; 2. Institute of Metal Research，Chinese Academy of Sciences, Shenyang 110016, China).p17-20

AbstractIn order to research residual stress for non-penetration laser lap welding of stainless steel plate, the 2 mm+2 mm cold rolling SUS301L stainless steel plates were welded by axial flow CO2laser. The indentation strain-gage method, sectioning-relaxation strain-gage method and X-ray diffraction method were used to measure residual stress in the lap welded joints. The results from the indentation strain-gage method show that the peak value of longitudinal residual stress is 237 MPa, the maximum transverse residual stress is 124 MPa, and all the residual stress values reflect an average around 2 mm near the surface layer. The results from the sectioning-relaxation method show that the peak value of longitudinal residual stress is 155 MPa, the transverse residual stress is 55 MPa, and all the residual stresses are an average in the sample whole section with 5 mm×5 mm×2 mm. The results from X-ray diffraction method show that the maximum longitudinal residual stress value is 344 MPa, the transverse residual stress peak value is 163 MPa, and all the residual stresses are an average in the circle of 1～2 mm in diameter near the surface layer. Comparatively speaking, the error from X-ray method is higher than the other methods due to the obvious texture and coarse grains.

Keywords：stainlesssteelsheet,laserlapwelding,residualstress,indentationstrain-gagemethod,sectioning-relaxationstrain-gagemethod,X-raydiffractionmethod

Microstructureandmechanicalpropertiesofbobbintoolfricationstirweldedjointof6005A-T6aluminumalloyprofiles

Shi Guanglei1，Zhang Jingyu1，Hu Feng1, Pan Xiaoyang2, Zhang Yingbo3, Li Kangning3, Ji Hua4

(1. CRRC Zhuzhou Locomotive CO., LTD, Zhuzhou 412000, Hunan, China; 2. Aerospace Engineering Equipment (Suzhou) Co.,Ltd, Suzhou 215100, Jiangsu, China；3. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 4. Shanghai Aerospace Equipment Manufacture, Shanghai 200245, China).p21-25

AbstractBobbin tool frication stir welding butt welded joints were fabricated for 6005A-T6 aluminum alloy profiles with 4.5 mm thickness at higher welding speed. The results show that the welds are excellent both in appearance and properties, but it is more likely to form defects such as tunnel and crack. At the selected welding parameters, the properties of welds shows close relationship with the line energy density, its tensile strength increases with the increase ofWPand reached up to 231 MPa, 77% of the base metal strength at the welding parameters of 1 400 r/min and 1 400 mm/min. The fracture appearance analysis indicates that the fracture mode changes from mixed fracture to ductile fracture with the increase ofWP.

Keywords： 6005A-T6aluminumalloy,bobbintoolfricationstirwelding,microstructure

EffectofbrazingtemperatureonmicrostructureandpropertiesofGH4169 / 1Cr18Ni9Tijoints

Lin Zhifeng1,Chen Zhikai1, Xing Bin1,Li Xuefei1,Deng Lifen2

(1.Capital Aerospace Machinery Company, Beijing 100076, China;2.Tianjin Aerospace Long March Launch Vehicle Manufacturing Co.,Ltd,Tianjin 300462,China).p25-28

AbstractThe GH4169/1Cr18Ni9Ti dissimilar metals was bonded by vacuum brazing using the BNi82CrSiB nickel-based solder. The effect of brazing temperature on the interface microstructure, micro-hardness and joint properties was studied by optical microscopy, energy dispersive spectroscopy, microhardness instrument and tensile testing machine. The results showed that, the joints were mainly composed of nickel-based solid solution in the 1 060-1 100 ℃, and there were no intermetallic phase in the joints. The fracture analysis results showed that all the joints failed with the ductile fracture mode in the diffusion zone closed to the 1Cr18Ni9Ti base metal.

Keywords：vacuumbrazing,GH4169/1Cr18Ni9Ti,ductilefracture,microstructure

Designof150kV/30kWinverterpowersupplyforEBmachineanditsweldingapplicability

Xu Haiying，Zuo Congjin，Sang Xinghua， Fu Pengfei

(Science and Technology on Power Beam Processes Laboratory，Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China).p29-33

AbstractIn order to acquire stable electron beam and enhance the quality of electron beam machine, the topology circuit of AC-DC-AC-DC-AC-DC and double closed loop control had been adopted to design high voltage power source, bias voltage power source and filament power source. The inverter power supply, 150 kV EB gun, vacuum system and others control system were integrated to establish a set of EB machine. Besides the high voltage and the maximum EB current output had been detected, the uniformity of welding parameters and the weld depth also had been measured. Through the series of tests, the results show that not only the inverter power source has a good linearity of high voltage output, but also the maximum beam output is up to 200 mA. The welding depth of titanium alloy is up to 100 mm. The welding tests show that the EB machine has excellent welding applicability.

Keywords：highvoltage,inverterpowersupply,EBmachine

Slagdetachabilityofstainlesssteelselfshieldedfluxcoredwire

Xu Kegui1, Wang Junyu1, Hao Zenglong1, Yang Fengjun1, Yang Yiyong2, Zhang Jiaqing3,Song Yang1

(1. Harbin Welding Institute, China Academy of Machinery Science and Technology, Harbin 150028, China; 2. Dalian CIMC Logistics Equipment Co., Ltd., Dalian 116600, Liaoning, China; 3. Xiamen University Tan Kah Kee College, Zhangzhou 363105, Fujian, China).p33-37

AbstractIn order to quantitatively analyze the effect of slag components of self-shielded flux-cored wire on the slag detachability, the method of extreme vertex mixing regression and the Design Expert 8.0 software of stat-ease company were used to make experiment design and result analysis. In the experiment, the mathematic model of slagging rate and slag composition was established by using the seven components in the slag as the independent variables and the deslagging rate of the weld as the objective function. when the content of the four components is kept to be unvaried, the effect of the other three components on the dependent variable can be intuitively observed by two-dimensional contour map and the three-dimensional response surface diagram. The optimal slag composition was obtained by the function of optimization solution of the software. The experimental results show that the method has a good reference to the slag design of flux cored wire. The fitted equation to predict slag removal rate was similar to the actual slag removal rate by actual validation, which indicates that the method has some guiding significance for design of slag components of flux-cored wire.

Keywords：slagcomponents,deslaggingrate,mixedregressiondesign

Analysisandcontrolofdissimilarmetalscircumferentialweldcrack

Guo Xiang，Lu Lili，Wang Fei，Ye Yihai

(Science and Technology on Reactor Fuel and Material Laboratory，Nuclear Power Institute of China，Chengdu 610041, China).p38-42

AbstractCrack is the main defect of dissimilar metals circumferential weld in nuclear industry. The crack of dissimilar metals circumferential weld had been analyzed and controlled from chemical composition, backing welding technology, welding heat input and constrained state. Weld performances were valuated by X-ray examination, metallographic examination, and residual stress analysis. The circumferential weld crack had been eliminated and the residual stress had been decreased. The results has good reference for the control of dissimilar metals circumferential weld crack.

Keywords：dissimilarmetals,circumferentialweld,crack,residualstress

Microstructureandpropertiesofaluminum6061/copperH60weldedjointbytigconductionwelding

Zuo Yong, Tian Yu, Liu Tao

(China Petroleum Pipeline Engineering Corporation, Langfang 065000, Hebei, China).p43-47

AbstractTo achieve the reliable joining of aluminum 6061 and copper H60, copper alloy was heated by TIG arc to melt the aluminum alloy. The microstructure of the joint was analyzed by scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The effect of welding current on the microstructure and properties of the joints was investigated. The results revealed that the microstructures of the joint are copper substrate/ Al4Cu9layer/Al2Cu layer/α-Al+Cu5Zn8+Al2Cu phases/aluminum substrate. The thickness of Al4Cu9+Al2Cu layers near to the copper substrate is increased with the increase of welding current. However, when the welding current reached 110 A, micro-cracks were observed along the copper substrate. The tensile load increases with the increase of welding current until maximum tensile load of 1.67 kN was reached, and then decreases at higher welding current.

Keywords：aluminumalloy,copperalloy,TIGwelding,interfacemicrostructure

Developmentoffillermetalsforflamebrazingofzincalloy

Huang Junlan, Long Weimin, Dong Xian, Lü Dengfeng

(Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450001, China).p47-50

AbstractFour filler metals were applied to braze zinc alloy by flame brazing. Based on the results of melting temperature, wettability, the mechanical properties and the porosity of brazed seam, the ideal filler metal SnZn-1 for Zinc alloy was successfully obtained. The microstructure and compounds of the brazed joint were further studied by SEM and EDS. The results show that the tensile strength of SnZn-1 brazed joint reaches up to 62 MPa, and the porosity rate is about 10%. The most of interface microstructure are uniform equiaxed structure, and the mutual diffusion and dissolution of elements occur between the base metal and the filler metal, which forms the better brazed joint.

Keywords：zincalloy,flamebrazing,tensilestrength,porosity

Microstructureandcorrosionresistanceoffrictionstirweldedjointsofthick6061aluminumalloyplate

Zhao Limin, Nie Pan

(School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, China).p51-55

AbstractThe double-sided friction stir welding process were used to weld 6061 aluminum alloy with the thickness of 30 mm, and the microstructure, micro-hardness and corrosion resistance of the welded joints were analyzed and tested by means of metallographic microscope, micro-hardness tester and electrochemical workstation. The metallographic observation shows that there is an obvious boundary between the advancing side of the friction stir welded joint and the base metal, while the boundary of retreating side and the base metal is blurred, the grains in weld nugget zone are homogeneous and fine equiaxed crystal. The micro-hardness curve of friction stir welded joints shows a “W” shape. The minimum micro-hardness appears in the heat affected zone. The corrosion test shows that the corrosion current is larger in the overlapping area of double-side welded joints, once the corrosion is started, the corrosion speed is very fast, and the corrosion resistance is relatively poor.

Keywords：frictionstirwelding,microstructure,micro-hardness,corrosionresistance

NuclearpowerplantsteelcontainmentvesselSA738Gr.Bsteelweldcrackreasonanalysisandprevent

Tang Shi1，Liu Fei1,Hu Qingrui2

(1.State Nuclear Power Demonstration Plant Corp., Ltd., Weihai 264312, China; 2.Ying Kou Institute of Technology, Yingkou 115000, Liaoning, China).p55-60

AbstractFor the actual situation of the crack in weld produced between the shell and steel containment gate insert plate in the a domestic nuclear power engineering project, the quality control of welding process, welding hot crack, cold crack, lamellar tearing, the causes of stress corrosion crack and reheat crack were analyzed in detail. The SA738Gr. B steel weld cracking reasons were found and the reasonable precautions were taken to avoid cracks, which provides references for subsequent project SA738Gr. B steel welding process.

Keywords：nuclearpowerplant,steelcontainmentvessel,SA738Gr.Bsteel,weldcrack,preventivemeasures

Studyonlaserweldingprocessof5052aluminiumalloy

Yu Jianhao，Zhang Jiahua，Ma Yuying

(Wuxi Institute of Arts & Technology, Yixing 214206, Jiangsu, China).p61-63

AbstractThe 1 kW fiber laser of single mode was used to weld the 5052 aluminium alloy with 1 mm thickness. The orthogonal experiment with three element of laser power, welding speed, defocusing amount was designed, and the best process parameter was the power of 900 W, welding speed of 100 mm/s，and the defocusing amount of 2 mm.The results of the tensile tests showed that the highest tensile strength is 282 MPa, achieves to 72% of that of the base metal. The cross section of the joints showed that full-penetration, no blowhole and no lack of materials, the strength of welded joint is the highest.

Keywords：aluminiumalloy,fiberlaser,welding,strength

Designedofresistanceweldingequipmentforheatingplateofelectrickettle

Sun Tao，Wang Yafang

(Guangdong Polytechnic of Industry and Commerce, Guangzhou 510510, China).p64-67

AbstractIn order to weld the heating plate and nail in the electric kettle, the automatic resistance welding equipment was designed. The equipment consisted of heating plate feeding mechanism, nail feeding mechanism, the assembling and clamping fixture, resistance welding machine. The batching heating plate and nail were fed on the hopper by human, and then the feeding mechanism took each part and automatic assemblied. After being positioned and clamped by the fixture, the specimen was transport to the welding station, and was automatically welded. The result of simulated production showed that the equipment realized automatic production, and saved 3 human consumption.

Keywords：heatingplate,nail,resistancewelding,automation

编辑常 青

《焊接》征稿简则

《焊接》是由中国机械工业联合会主管，机械科学研究院哈尔滨焊接研究所、中国机械工程学会焊接学会主办，国内外公开发行的技术类期刊。《焊接》被权威机构评为中文核心期刊、中国科技核心期刊，并多次获重要奖项。融学术、技术、商业信息于一体，面向焊接及其相关领域的技术人员、大专院校师生、经营管理人员和技术领导干部等群体，开设焊接名人、专家论坛、专题综述、试验研究、生产应用、经验交流、焊接培训、焊接标准、国外焊接、焊接沙龙等栏目。多年开展广告业务，为厂家树立企业形象、介绍新产品、新技术、提高经济效益作出一定贡献。欢迎广大焊接及相关专业工作者投稿。

《焊接》在选题上突出科学性、创新性、导向性和实用性。投稿内容为焊接及相关专业的专题论文。对属于国家重大科技攻关项目、国家自然科学基金资助项目、省部级科研基金资助项目的论文及其它具有应用价值的论文，将优先发表。

《焊接》编辑部有权对录用的稿件作适当修改，无论录用与否一般不退稿。发表的论文文责自负，谢绝一稿两投。《焊接》对投稿的具体要求如下：

(1) 论文内容在学术上应有创新并具有一定的应用价值。

(2) 论文应论点明确、论据充分、条理分明、数据可靠、实事求是、文字精练，专业名词术语应前后统一并标准化。

(3) 科研基金项目的论文，应写出项目的名称和编号，并将其排放在论文首页下方。

(4) 论文题目的字数限定在20字以内。题目下方应依次写出作者姓名(同一单位的作者署名人数限定在4人以内)、作者工作单位、所在地名以及邮政编码,专题综述、试验研究、生产应用栏目的论文需写出中文摘要(200～300字)和关键词3～5个(关键词不能用缩略语)。并写出与中文摘要对应的英文摘要，英文表述应清楚、准确。包括题目、作者姓名、作者工作单位、摘要、关键词等均用英文写出。

摘要应说明论文研究主题及工作范围、所用方法、结果和结论。不应出现图表、冗长的数字公式和非公知公用的符号、缩略语。摘要不应太短，不应重复文章题名已给出的信息；不要用历史背景信息；不要包括作者未来的研究计划。

(5) 论文中的计量单位一律使用《中华人民共和国法定计量单位》。

(6) 文中的图表内容和图表注(包括分图图题)只用中文表达。

(7) 在文中坐标图(采用方框图)的横纵坐标上要标注物理量名称、物理量符号及物理量单位共三项，不可缺一。例如：动量p/(kg·m·s-1)。坐标图要求采用origin或visio软件制图。

(8) 文中表格采用三线表，表中物理量要标注物理量名称、物理量符号及物理量单位。

(9) 文中首次出现的英文缩写字母和公式中的各物理量符号的含义应有文字解释。

(10) 参考文献应按文中引用的先后顺序排列于文后，并用方括号标注在文中引用处。参考文献只列主要的、公开发表过的文献。应严格按《文后参考文献著录规则》(GB/T 7714—2005)进行著录，著录项目要齐全。其著录格式举例如下。

例1 期刊： 序号 作者.篇名[文献类型标识].期刊名，年，卷(期)：起止页.

[1] 刚 铁，徐 艳，迟大钊，等. 铝合金焊缝超声TOFD检测的信号特征[J].焊接学报，2005，26(8)：1-4.

例2 书： 序号 作者.书名[文献类型标识].版本.出版地：出版者，出版年: 起止页.

[1] 刘少奇.论共产党员的修养[M].北京：人民出版社，1962：70-76.

参考文献作者不超过三个时，全部照录。超过三个时，只著录前三个，其后加“等”字。

参考文献类型标识以单字母标示见下表。

参考文献类型专著论文集报纸期刊学位论文报告标准专利汇编网络文献类型标识MCNJDRSPGOL

(11) 将“作者简介”(第一作者及通讯作者)排放在文章末尾处，其内容应包括作者姓名、出生年、学历、职称、研究方向、主要科研成果、已发表的论文数量和联系方式。

MAIN TOPICS，ABSTRACTS & KEY WORDS
Effectofmicro-alloyingnickelandniobiumelementsonmechanicalpropertiesofweldedjointwithmetalpowder-coredwire

Liu Zhengjun，Qiu Rongpeng，Wu Dan，Su Yunhai

(School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China).p1-6

On the basis of high strength low alloy steel flux cored wire which was designed by authors, the effects of micro-alloying elements nickel and niobium on mechanical properties of welded joint were researched by tensile test, charpy V-notch test, et al. Combined with metallographic observation and scanning electron microscopy analysis and chemical analysis, the mechanism about the effect of micro-alloying nickel and niobium elements on mechanical properties of welded joint was reasonable explained from the microstructure and chemical composition. The results show that the micro-alloying nickel element in the flux cored wire plays the role of increasing strength of welded joint by increasing the contents of bainite and martensite in the weld metal, and improve impact toughness of welded joint at low temperature through promoting the nucleation and growth of acicular ferrite. The micro-alloying niobium elements in the flux cored wire has the same effect with the micro-alloying nickel element that is beneficial to promote the nucleation and growth of acicular ferrite, meanwhile it can enhance the tensile strength of welded joint by refining grain and precipitation strengthening.

metalpowder-coredwire，highstrengthsteel，nickelelement，niobiumelement，acicularferrite

2017-04-06

TG454

孙 涛，1970年出生，学士学位，高级工程师。主要从事机械设计工作。