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Segregation in fusion weld of 2219 aluminum alloy and its influence on mechanical properties of weld

Transactions of Nonferrous Metals Society of China 2017年第2期27卷 258-271页

作者：李权吴爱萍李艳军王国庆齐铂金鄢东洋熊林玉清华大学机械工程系北京100084 首都航天机械公司北京100076 清华大学摩擦学国家重点实验室北京100084 清华大学先进成形制造教育部重点实验室北京100084 中国运载火箭技术研究院北京100076 北京航空航天大学机械工程及自动化学院北京100191 北京宇航系统工程研究所北京100076

Three kinds of welds were made using low frequency pulse current variable polarity tungsten inter gas （LPVPTIG） with argon shielding, direct current TIG （DCTIG） with helium shielding and high frequency pulse current variable polarity TIG （HPVPTIG） with argon shielding, respectively. It was found that macrosegregation bands with large amount of thick continuous eutectics and microporosities formed in the LPVPTIG weld due to the fluctuation of the pulse varied heat input. Only microsegregation existed in the DCTIG weld and HPVPTIG weld. However,the HPVPTIG weld had lower extent of Cu microsegregation since its welding speed was slower. The tensile results indicated that the mechanical properties of the weld decreased with the increase of the segregation extent of Cu and porosities, and LPVPTIG weld had lower tensile properties in the longitudinal direction than those in the transverse direction due to the macrosegregation bands.

关键词： 2219 aluminum alloy fusion welding macrosegregation microsegregation mechanical behavior

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Review on underwater friction stir welding: A variant of friction stir welding with great potential of improving joint properties

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Transactions of Nonferrous Metals Society of China 2018年第2期28卷 193-219页

作者： Mohd.Atif WAHID Zahid A.KHAN Arshad Noor SIDDIQUEE Department of Mechanical Engineering Jamia Millia Islamia

Friction stir welding（FSW） is a solid-state welding process which is capable of joining materials which are relatively difficult to be welded by fusion welding process. Further, this process is highly energy-efficient and environmental-friendly as compared to the fusion welding. Despite several advantages of FSW over fusion welding, the thermal cycles involved in FSW cause softening in joints generally in heat-treatable aluminum alloys（AAs） due to the dissolution or coarsening of the strengthening precipitates leading to decrease in mechanical properties. Underwater friction stir welding（UFSW） can be a process of choice to overcome these limitations. This process is suitable for alloys that are sensitive to heating during the welding and is widely used for heat-treatable AAs. The purpose of this article is to provide comprehensive literature review on current status and development of UFSW and its importance in comparison to FSW with an aim to discuss and summarize different aspects of UFSW. Specific attention is given to basic principle including material flow, temperature generation, process parameters, microstructure and mechanical properties. From the review, it is concluded that UFSW is an improved method compared with FSW for improving joint strength. Academicians, researchers and practitioners would be benefitted from this article as it compiles significantly important knowledge pertaining to UFSW.

关键词： aluminum friction stir welding fusion welding mechanical properties microstructure underwater friction stir welding

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