45钢/W8Co3N高速钢刀具的摩擦焊接研究

对 45钢 /W8Co3N高速钢刀具的摩擦焊接工艺及焊接效果进行了试验研究 ,结果表明 ,采用优化的摩擦焊接工艺参数及合理的焊后热处理工艺可获得具有良好显微组织和力学性能的焊接接头。     

贝氏体合金钢轨与PD3钢轨闪光焊接工艺研究

通过试验研究了贝氏体合金钢轨与PD3钢轨两种异种材料闪光对接焊工艺，并确定了保证焊接接头质量的焊接工艺和热处理工艺等。整体焊接接头的强韧性达到了《时速200公里客运专线60AT钢轨焊接暂行技术条件》的要求，可以满足提速或准高速贝氏体钢焊接辙叉制造技术标准的要求。     

超低碳贝氏体WDB620钢及其焊接性

介绍了超低碳贝氏体WDB620钢的力学性能，用几种传统的焊接性试验方法对该钢焊接接头的力学性能及抗裂性进行了研究。结果表明，超低碳贝氏体WDB620钢具有良好的强韧性；当焊接热输入量小于35kJ／cm时，焊接接头性能良好。该钢具有很低的焊接冷裂纹敏感性。     

100CrMo6轴承钢热处理及强韧化研究

本文利用力学，金相Ｘ射线衍射分析等手段对行德国轴承钢１００ＣｒＭｏ６的热处理基本性能和工艺参数进行了研究，并着重探讨分析了马氏体＋贝氏体复合组织的强韧化问题。通过试验确定了最佳淬火温度，通过强韧化对比提出了最佳回火温度。复合组织的力学性能试验证明，与普通淬火＋回火相比其马氏体，下贝氏体复合组织或完全下贝氏体组织可使钢的强韧性大大提高。     

冷处理对Cr12MoV钢硬度的影响

通过测定不同热处理条件下Ｃｒ１２ＭｏＶ钢的硬度值和残余奥氏体量,并通过金相和透射电观察发现,钢中的残余奥氏体和下贝氏体组织对冷作模具钢的耐磨性能有不利的影响,采用冷处理工艺抑制下贝氏体转变,显著提高Ｃｒ１２ＭｏＶ钢的硬度和耐磨性能。     

工程油缸活塞杆摩擦焊接工艺优化研究

对材料为45钢、直径为?48的工程油缸活塞杆摩擦焊接技术进行了系统深入的研究，从工程油缸活塞杆焊接结构、热处理时机和摩擦焊接工艺规范3个方面因素，对活塞杆摩擦焊接接头综合性能的影响进行了研究。通过试验研究揭示了摩擦焊接各因素与焊接接头可靠性的关系，初步建立了活塞杆摩擦焊接成型与控制的工程体系。制订了活塞杆接头可靠性所需的工艺规范，使活塞杆摩擦焊接接头的抗拉强度达到800 MPa以上，屈服强度达到500 MPa以上，断面收缩率达到35%以上，满足了工程液压缸的技术要求。验证了优化后摩擦焊接工艺规范加工成型的焊接接头可靠性，优化后焊接接头合格率达到99.99%以上。     

Mo-Nb贝氏体钢的铸态组织与耐磨性研究

为改进农机耙片的材质和工艺，研制开发了1种新型Mo—Nb贝氏体钢，它采用液态挤压铸造使耙片一次成形，以代替原65Mn钢和传统生产工艺。新型Mo—Mb贝氏体钢是通过合金化和控制冷却速度的方法，不需热处理而在铸态下直接得到贝氏体组织和所需性能。研究结果表明，新型Mo—Nb贝氏体钢的耐磨性明显优于热处理后的65Mn钢。     

低碳贝氏体钢的焊缝结晶裂纹敏感性研究

采用横向变拘束热裂纹试验方法（ＶａｒｅｓｔｒａｉｎｔＴｅｓｔ）对低磷贝氏体钢的焊缝结晶裂纹敏感性进行了研究。并与４２ＣｒＭｏ、３０ＣｒＭｎＳｉＡ钢作了对比．结合三种材料的结晶裂纹断口形貌讨论了化学成分和高温塑性对结晶裂纹敏感性的影响规律。结果表明，低碳贝氏体钢的结晶裂纹敏感性较小．导致这一结果的主要原因是由于低碳贝氏体钢焊缝中晶间低熔点偏析物较少，金属的高温塑性较好，因而具有较高的抗焊缝结晶裂纹的能力．     

碳和硅含量及热处理参数对贝氏体钢性能的影响

通过调整C、Si含量及热处理工艺参数，根据因素效应回归分析求出了影响材料机械性能的数学模型。探讨了贝氏体抗磨钢材料性能的影响。     

提高5CrMnMo锻模热疲劳抗力的热处理工艺改进

本文对５ＣｒＭｎＭｏ钢制作的支座热锻模产生热疲劳的原因进行了粗浅的分析，并对其热处理工艺进行了改进；适当提高了淬火加热温度和回火时的３００℃等温处理，使表层得到板条状马氏体组织，心部得到下贝氏体组织，从而提高了５ＣｒＭｎＭｏ支座模具的使用寿命。     

连续驱动摩擦焊机的研究现状和展望

摩擦焊接是一种优质、高效、节能和环保的固相连接技术,广泛应用于航空、航天、机械制造和石油勘探等领域。摩擦焊机是实现摩擦焊接技术的一种工业自动化设备,连续驱动摩擦焊接方法是最先试验成功的实用焊接方法,连续驱动摩擦焊机也是最经典的摩擦焊机。本文针对国内外连续驱动摩擦焊机设备的研究和应用现状,从主机、液压以及控制系统3个角度综述其发展概况,并在此基础上预测了连续驱动摩擦焊机的发展趋势和方向。     

Optimization of friction welding of tube-to-tube plate using an external tool by Taguchi method and genetic algorithm

Numerous advancements have been occurring in the field of materials processing. Friction welding is an important solid-state joining technique. In this research project, friction welding of tube-to-tube plate using an external tool (FWTPET) has been performed, and the process parameters have been prioritized using Taguchi??s L₂₇ orthogonal array. Genetic algorithm (GA) is used to optimize the welding process parameters. The practical significance of applying GA to FWTPET process has been validated by means of computing the deviation between predicted and experimentally obtained welding process parameters.     

摩擦焊机主交流电机输出功率的计算机检测

摩擦焊机主电机输出功率是摩擦焊接过程能量消耗和供能状况之间联系的纽带，是研究摩擦焊能量转换的重要环节．本研究借助高性能的微机系统，实现了对摩擦焊机主电机输出功率的检测，并给出了摩擦焊机主电机输出功率曲线的数学模型，为进行摩擦焊精确的能量控制和功率极应控制方法创造了良好条件．     

铝合金搅拌摩擦焊技术研究

论述了搅拌摩擦焊的焊接方法、工艺过程和基本原理；通过大量的工艺参数优化，解决了焊缝中的孔洞问题，使ＬＦ６板材搅拌摩擦焊的焊缝达到与母材等强，ＬＹ１２焊后未经热处理，连接强度接近母材的８０（。由金相分析可以看出，搅拌摩擦焊属于固相连接，焊缝晶粒细小，无气孔、夹杂、裂纹等焊接缺陷。初步应力测试发现，搅拌摩擦焊焊缝比熔焊焊缝的残余应力低。试验研究结果表明，搅拌摩擦焊焊接过程稳定可靠，焊接接头性能良好，具有广泛的应用前景。     

A fully coupled thermo-mechanical model of friction stir welding

This paper presents a new developed fully coupled thermo-mechanical model of the friction stir welding process. Results indicate that the rotation of the shoulder can accelerate the material flow behavior near the top surface. The material deformation and the temperature field can have relations with the microstructural evolution. The texture of the appearance of the friction stir welds can correlate well with the equivalent plastic strain distributions on the top surface. The temperature field in the friction stir welding process is approximately symmetric to the welding line. The material flows in different thicknesses are different. The shoulder can have a significant effect on material behaviors on the top surface, but this effect is greatly weakened when the material gets closer to the bottom surface of the welding plate.     

A study on heat-flow analysis of friction stir welding on a rotation affected zone

In recent years, as interest in environmental protection and energy conservation rose, technological development for lightweight efficiency of transport equipment, such as aircrafts, railcars, automobiles and vessels, have been briskly proceeding. This has led to an expansion of the application of lightweight alloys such as aluminum and magnesium. For the welding of these lightweight alloys, friction stir welding has been in development by many researchers. Heat-flow analysis of friction stir welding is one such research. The flow and energy equation is solved using the computational fluid dynamic commercial program ‘Fluent’. In this study, a rotation affected zone concept is imposed. The rotation affected zone is a constant volume. In this volume, flow is rotated the same as the tool rotation speed and so plastic dissipation occurs. Through this simulation, the temperature distribution results are calculated and the simulation results are compared with the experimental results.     

搅拌摩擦加工制备金属基复合材料的研究现状

搅拌摩擦加工技术是源于搅拌摩擦焊接技术的一种加工技术,目前已经被用于各种复合材料制备的研究中.本文主要介绍了搅拌摩擦加工技术制备复合材料的原理,概述了目前采用搅拌摩擦加工技术制备复合材料的研究进展,简要分析了搅拌摩擦加工制备复合材料的应用前景.     

Effect of projection on joint properties of friction welding of tube-to-tube plate using an external tool

Friction welding is widely used as a mass-production method in various industries. Friction welding of tube-to-tube plate using an external tool (FWTPET) is an innovative friction welding process and has potential applications in aerospace, railways, automotive, and marine industries. FWTPET is capable of welding tube-to-tube plate of similar and dissimilar metals and is capable of producing good-quality leak-proof weld joints. In this work, FWTPET welds have been produced with six different tube projections. Tool steel has been used to join the FWTPET process. After the completion of welding, macrostructural and microstructural studies have been conducted and it reveals the weld configuration that is capable of generating defect-free welds. Further, hardness and pull strength of welds obtained with six different tube projections have been studied. When compared to other weld conditions, 1 mm projection has resulted in better strength. The weld strength and average weld interface hardness with 1 mm projection are 84.72 MPa and 70.58 Hv respectively. The sufficient heat generation has been occurred at optimum projection in FWTPET process.     

3A21与6063异种铝合金搅拌摩擦焊接头性能分析

为研究3A21与6063异种铝合金材料摩擦搅拌焊接头性能,文中选取了16组不同的焊接工艺参数进行搅拌摩擦焊接试验。在试验过程中,为研究焊缝处的力学性能,减小了试件焊缝处的宽度,使拉伸断裂处能发生在焊缝处。通过整理试验数据,分析了6063-O/3A21与6063-T6/3A21焊接接头抗拉强度与接头硬度随焊速、转速以及焊速转速比变化的分布规律,得到了适用的焊接参数范围。试验表明,通过合理选择焊接参数,得到了力学性能良好的焊接接头,达到了工程应用要求。     

用于分层制造的超声波多层焊接开裂问题研究

对应用于分层制造的多层金属板材超声波焊接的开裂问题进行了试验研究和理论分析,并找出了开裂的根本原因:①存在焊接缺陷;②摩擦剪切应力、抗形变内应力和疲劳效应的共同作用.