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铝合金激光焊接工艺特性研究 总被引:3,自引:0,他引:3
结合近年铝合金激光焊接的研究情况,阐述了铝合金激光焊接与复合焊接的特点以及研究现状,分析了铝合金的焊接特性以及焊接工艺参数对焊接质量的影响,讨论了激光焊接时存在的问题和解决措施。 相似文献
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铝合金具有较高的热导率,导致焊接时热量迅速传递给周围材料,容易造成熔池飞溅、产生裂纹等,影响焊接效果,为此,文中提出采用激光焊技术对建筑电气设备铝合金壳体实施焊接,并从焊接接点部署、焊接拉伸角度、激光入射角度等方面计算焊接最佳参数;引入锤击法完成铝合金壳体的锻延,增加焊接处关联密度,提高整体焊接质量。试验结果表明,利用这种方法对建筑电气设备铝合金壳体展开焊接,能够有效避免焊接飞溅、裂纹等的产生,整体焊接质量较高。 相似文献
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Summary Pore formation is an important concern in laser welding of automotive aluminium alloys. This paper investigates the influence of laser beam defocus on pore formation during continuous wave Nd:YAG laser welding of 5182 and 5754 automotive aluminium alloys. It was found that the instability of the keyhole during welding was a dominant cause of pore formation while hydrogen rejection played an insignificant role. The defocusing of the laser beam greatly affected the stability of the keyhole. Finally, the mechanism of keyhole collapse and pore formation is proposed. 相似文献
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Corrosion behaviour of laser beam welded aluminium and magnesium alloys in the automotive industry The pitting behaviour of unwelded and laser beam welded AlMgSi alloys and an AlMgMn alloy was investigated. Electrochemical investigations and the metallographic determination of the pit volume were used to characterize the susceptibility to pitting corrosion. Both investigation methods showed that, in the unwelded condition, the material AlMgMn was the most resistant. In the case of laser beam welded materials, the resistance to pitting corrosion is lower or also higher than that of the non-affected materials depending on the material combination selected. The material combination AlMgSi0.5/AlMgSi1 F21 proved to be the most suitable. Magnesium extruded alloys with approx. 3 to 8% Al and 0.5 to 0.8 % Zn are susceptible to filiform corrosion and pitting corrosion in aqueous chloride solutions depending on chloride concentration. The resistance of unwelded alloys increases with Al content. On welding of the alloys, the corrosion resistance is determined by the Al/Mg proportion at the surface of the non-affected material and the laser welding seam. The pits occur mainly in the heat affected zone of the welding seam. The laser beam welded material AZ61 HP was found to have the highest resistance. 相似文献
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Seiji Katayama Satoshi Kawaguchi Masami Mizutani Yousuke Kawahito Taishi Tarui 《Welding International》2013,27(10):753-762
Laser welding of aluminium alloys is difficult because of their low laser coupling, easy formation of welding defects, etc. and thus the establishment of in process monitoring technique is expected in various industries to obtain highly reliable laser welds. In this study, therefore, both the reflected laser beam and radiation light from die molten pool were investigated as monitoring signals during YAG laser welding of A5052 and A5182 aluminium alloy to confirm validity and usefulness of these signals for monitoring. At the same time, laser-welding phenomena were observed through a high-speed video camera to better interpret the monitored signals. Two signals were detected by utilizing photo sensors and band pass or cut-off filters coaxially against a laser beam and from the above-back direction. In this paper, experimental setup, and monitoring and observation results were presented. The correlation between monitoring signals and welding phenomena was clarified when the welding defects such as underfilling and through holes were formed. 相似文献
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《Science & Technology of Welding & Joining》2013,18(5):265-276
AbstractLaser beam welding is now a common manufacturing method for a wide range of steel products from automobiles to razor blades. However, the process has only recently been approved for critical applications involving aluminium alloys, notably in the aerospace and automotive industries. The properties of aluminium alloys influence the interaction between the beam and the material to a far greater extent than for steels. The challenge of developing industrial welding procedures has therefore been considerable. The present review describes the effects of CO2 and Nd–YAG laser beam processing parameters and the properties of the most common wrought aluminium alloys on the characteristics of welded joints. Porosity, solidification cracking, and poor weld bead geometry are shown to be the most frequently encountered imperfections. These can be eliminated through the use of appropriate filler materials, process gases, material preparation, and in some instances, adaptive control systems. Very little work has been reported on the corrosion properties of laser welded aluminium alloys. Experimental processing parameters are presented and compared using an analytical model, which can also be employed for predictive purposes. A number of industrial applications are described. These demonstrate that, for specific alloys, the process is now sufficiently well understood to be approved for high volume production, particularly in the transport industries. 相似文献
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I. N. Shiganov A. I. Misyurov A. N. Trushnikov A. A. Kholopov V. V. Blinkov 《Welding International》2017,31(1):67-70
Special features of laser welding of aluminium alloys with laser and arc heat sources are investigated. Advantages and shortcomings of these methods are noted. Experiments were carried out to combine laser and arc heat sources for welding aluminium alloys. Equipment for hybrid welding is described. The technological parameters influencing the external formation of the welded joints are determined. Specific conditions for welding 1424 aluminium alloys with a thickness of 4.0 mm are presented. High-quality welded joints were produced by hybrid laser-arc welding in 1424 alloy with a thickness of 4.0 mm. 相似文献
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铝合金的可焊接性较差,熔焊时易产生裂纹和气孔等缺陷,理论分析了缺陷产生的原因.真空电子束焊接独特的优点可以解决铝合金的焊接难题.空心铝球的焊接更有特殊性,采用真空电子束焊接比激光焊接更为有利.主要探讨了工件的精度、清洁处理、工装夹具、焊接范等因素对焊接质量的影响,并分析了焊接结果. 相似文献
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Andrzej Klimpel Jacek Górka Artur Czupryński Tomasz Kik Bartłomiej Nowak 《Welding International》2013,27(2):91-99
The classification of aluminium alloys on the basis of main alloy elements and usability for heat treatment is presented. The essential problems occurring in welding of aluminium and its alloys are mentioned. The most advanced methods of joining these materials are described. Results of investigations into the possibility of joining of thin walled elements of aluminium alloys by low heat input arc welding methods, plasma arc welding and hybrid laser+MIG welding are also presented. 相似文献