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高效、固相焊接新技术--搅拌摩擦焊 总被引:7,自引:2,他引:7
在介绍搅拌摩擦焊(FSW)技术特点的基础上,对发达国家在搅拌摩擦焊接技术的工业化应用进行了综述,并且对中国搅拌摩擦焊中心在镁合金、铜合金、钛合金、塑料等材料的搅拌摩擦焊工艺研究、复杂铝合金构件开发以及搅拌摩擦焊设备制造等方面进行了较全面的介绍.搅拌摩擦焊接技术是一项高效、固相焊接新技术,在铝合金结构焊接方面具有广阔的应用前景. 相似文献
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搅拌摩擦焊(Friction Stir Welding,FSW)是近些年发展起来的一种固态连接工艺,尤其适用于铝合金材料的焊接。概述了搅拌摩擦焊的局限性,主要包括接头处存在钥匙孔、焊缝减薄等缺陷及复杂结构铝合金难以焊接等问题。研究表明,通过工艺方法、流程及参量的优化能够对焊接接头缺陷和焊件结构问题进行有效控制。由此,归纳了铝合金搅拌摩擦焊接头存在的关键问题及解决策略,分析了每种工艺方法的适用对象及条件,包括摩擦塞焊(Friction Plug Welding,FPW)、填充式搅拌摩擦焊(Filled Friction Stir Welding,FFSW)、回抽式FSW、静止轴肩搅拌摩擦焊(Stationary Shoulder Friction Stir Welded,SSFSW)、沉积式FSW、双轴肩搅拌摩擦焊(Bobbin Tool Friction Stir Welding,BT-FSW)和无倾角FSW。详细探讨了每种工艺的原理和机制,阐述了每种工艺的优缺点,重点介绍了工艺的参数优化调控、辅助设备的添加及工序的改进对修复接头组织与力学性能的影响。对铝合金搅拌摩擦焊的回顾总结,将为获得高质量搅拌摩擦焊接头,实现复杂结构件焊接提供参考依据。在此基础上,对铝合金搅拌摩擦焊现存问题及挑战的解决进行了展望。 相似文献
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《中国有色金属学会会刊》2021,31(11):3281-3309
Welding is a vital component of several industries such as automotive, aerospace, robotics, and construction. Without welding, these industries utilize aluminum alloys for the manufacturing of many components or systems. However, fusion welding of aluminum alloys is challenging due to several factors, including the presence of non-heat-treatable alloys, porosity, solidification, and liquation of cracks. Many manufacturers adopt conventional in-air friction stir welding (FSW) to weld metallic alloys and dissimilar materials. Many researchers reported the drawbacks of this traditional in-air FSW technique in welding metallic and polymeric materials in general and aluminum alloys and aluminum matrix composites in specific. A number of FSW techniques were developed recently, such as underwater friction stir welding (UFSW), vibrational friction-stir welding (VFSW), and others, for welding of aluminum alloy joints to overcome the issues of welding using conventional FSW. Therefore, the main objective of this review is to summarize the recent trends in FSW process of aluminum alloys and aluminum metal matrix composites (Al MMCs). Also, it discusses the effect of welding parameters of the traditional and state-of-the-art developed FSW techniques on the welding quality and strength of aluminum alloys and Al MMCs. Comparison among the techniques and advantages and limitations of each are considered. The review suggests that VFSW is a viable option for welding aluminum joints due to its energy efficiency, economic cost, and versatile modifications that can be employed based on the application. This review also illustrated that significantly less attention has been paid to FSW of Al-MMCs and considerable attention is demanded to produce qualified joint. 相似文献
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FSW of titanium alloys is nowadays one of the most challenging welding operations, even with a solid state process, due to the thermo-mechanical and thermo-chemical characteristics of such materials. Due to the relevant application of titanium alloys in the aeronautic and aerospace industries, in the recent years few attempts were carried out to develop FSW processes aimed to maximize the mechanical performances of the welded parts. In the paper a new fixture is presented allowing obtaining effective FSW joints of titanium blanks, which were investigated through mechanical and metallurgical tests highlighting the peculiarities of FSW of titanium alloys. 相似文献
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钛合金具有密度低、比强度高,耐蚀性好,加工性能优异等优点,主要应用于航空航天、交通运输和石油化工等领域。当钛合金作为结构材料应用在不同领域时,传统的熔融焊接方法会产生较大残余应力,组织粗化,变形大,裂纹和孔隙等缺陷;而采用搅拌摩擦焊接技术可以避免传统熔融焊接方法产生的缺陷,从而大幅度提高钛合金焊接接头质量。目前,钛合金的搅拌摩擦焊接技术已成为国内外研究热点。主要介绍搅拌摩擦焊接的原理、工艺特点,国内外关于钛合金FSW焊接接头的宏观形貌、微观组织(晶粒大小、织构)和力学性能等方面的最新研究进展,最后展望了钛合金FSW未来的研究方向。 相似文献
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Friction stir welding (FSW) offers an appealing solid state joining alternative to traditional fusion welding techniques for titanium alloys because it reduces problems associated with high temperature processing. Propellant tanks are a critical component of every spacecraft and contain several weld seams and a prime candidate for this innovative technology. This paper reviews the current technological maturity of FSW relative to titanium alloys and considers the application with respect to a pressure vessel. FSW is currently in a period of significant investment by large engineering companies and international research institutions. The technology is advancing and evolving to cater for high temperature alloys. Stationary shoulder FSW and hybrid techniques show promising potential with respect to Ti–6Al–4V. The tool material and limited process window for this material are restrictive factors at present but can be overcome with future development. 相似文献
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Postweld plastic deformation was reported to be able to largely enhance the mechanical properties of friction stir-welded (FSW) Mg alloys by changing microstructures in the regions with a soft-oriented texture. However, few studies have concentrated on the effects of postweld plastic deformations on the corrosion behavior of FSW Mg alloys, which has an impact on their application. In the present study, electrochemical measurements, hydrogen evolution, and mass loss tests were used to study the influences of postweld compression along the transverse direction and subsequent annealing on the corrosion rate of FSW AZ31 Mg alloys. It was found that owing to the grain refinement in the weld zones, an improvement in the corrosion resistance and hardness was observed in the FSW AZ31 sample compared to the base metal (BM) sample. Postweld compression was very harmful to the corrosion resistance of the FSW AZ31 alloys. On the basis of the mass loss results, the corrosion rate of the compressed FSW sample was ~17.62 mm/year, which was ~8.99 times that of the FSW sample (~1.96 mm/year). Subsequent annealing could slightly reduce the corrosion rate of the compressed FSW AZ31 plates, whereas the corrosion rate of the FSW-C-T sample (~13.63 mm/year) was much worse than that of the BM sample (~4.73 mm/year). 相似文献
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Aluminium alloy 7136 belongs to the Al–Zn–Mg–Cu group of aluminium alloys strengthened by precipitation. These alloys offer very good properties, i.e. high strength combined with good corrosion resistance, which makes them suitable for aerospace applications. The limited range of applications of these alloys is due to problems associated with their welding. The Al–Zn–Mg–Cu alloys are classified as non-weldable. The aim of this study was to determine the quality and properties of friction stir welded (FSW) joints of alloy 7136-T76. This article presents the results of a detailed study into the microstructure and mechanical properties of FSW welds. The paper demonstrates that the FSW method is suitable for joining Al–Zn–Mg–Cu alloys. The FSW joints are of good quality and high mechanical properties. Tests of joints created at various tool rotation speeds have shown that joints of suitable quality, in terms of microstructure and properties, can be obtained for a relatively wide range of process parameters. The tool rotation speeds applied during the welding process did not have a significant influence on the quality of the welds. 相似文献
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文中对Zr-Sn-Nb-Cr-Fe锆合金搅拌摩擦焊(friction stir welding,FSW)工艺、微观组织和腐蚀性能进行了分析. 结果表明,采用W-25%Re的搅拌工具在转速250 r/min、焊接速度40 mm/min、顶锻压力10 kN、氩气保护条件下可以获得成形良好且无焊接缺陷的锆合金FSW接头. 搅拌区(stir zone,SZ)剧烈的塑性变形促进动态再结晶、合金元素扩散和晶粒细化,晶粒尺寸随着转速增加而增大,同时SZ内在晶界位置处析出大量的形状不规则的第二相粒子. 不同焊接参数制备的FSW接头在360 ℃、18.6 MPa中性水中腐蚀72 h后均表现为黑色、光亮、致密的氧化膜,但随着转速增加接头耐腐蚀性能降低.
相似文献20.
M. Grujicic G. Arakere C.-F. Yen B. A. Cheeseman 《Journal of Materials Engineering and Performance》2011,20(7):1097-1108
A fully coupled thermo-mechanical finite-element analysis of the friction-stir welding (FSW) process developed in our previous
work is combined with the basic physical metallurgy of two wrought aluminum alloys to predict/assess their FSW behaviors.
The two alloys selected are AA5083 (a solid-solution strengthened and strain-hardened/stabilized Al-Mg-Mn alloy) and AA2139
(a precipitation hardened quaternary Al-Cu-Mg-Ag alloy). Both of these alloys are currently being used in military-vehicle
hull structural and armor systems. In the case of non-age-hardenable AA5083, the dominant microstructure-evolution processes
taking place during FSW are extensive plastic deformation and dynamic re-crystallization of highly deformed material subjected
to elevated temperatures approaching the melting temperature. In the case of AA2139, in addition to plastic deformation and
dynamic recrystallization, precipitates coarsening, over-aging, dissolution, and re-precipitation had to be also considered.
Limited data available in the open literature pertaining to the kinetics of the aforementioned microstructure-evolution processes
are used to predict variation in the material hardness throughout the various FSW zones of the two alloys. The computed results
are found to be in reasonably good agreement with their experimental counterparts. 相似文献