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首页> 外文期刊>Science and Technology of Welding & Joining >CO2 and Nd–YAG laser beam welding of 5754–O aluminium alloy for automotive applications
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CO2 and Nd–YAG laser beam welding of 5754–O aluminium alloy for automotive applications

机译:汽车应用5754–O铝合金的CO 2 和Nd-YAG激光束焊接

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摘要

Federal regulations have recently been enacted to reduce significantly the atmospheric pollution caused by motor vehicles. This has compelled automotive manufacturers to improve the fuel efficiency of cars and light trucks by using lightweight materials such as aluminium. The focus of the present work is to develop welding procedures for autogenous CO2 (continuous mode) and Nd–YAG (continuous mode) laser beam welding of 5754–O aluminium alloy. The mechanical and microstructural characteristics of the welded joints were evaluated using tensile tests, microhardness tests, optical microscopy, and chemical analysis. Results indicate that this alloy can be autogenously laser welded with full penetration, minimum surface discontinuities, and little if any loss of magnesium through vaporisation from the fusion zone. The total elongation (all weld metal) in the longitudinal direction for 5754–O laser welds produced using 5 kW CO2 and 3 kW continuous wave (CW) Nd–YAG shows a slight decrease with increasing travel speed. Studies indicate that the decreasing tendency is probably due to the orientation of the grains with respect to the loading direction. The welds produced using the 5 kW CO2 laser at travel speeds between 127 and 212 mm s-1 displayed a total longitudinal elongation of 19.13–15.12% and those produced using the 3 kW CW Nd–YAG laser at travel speeds between 85 and 148 mm s-1 displayed a total longitudinal elongation of 22.6–18.15%, compared with the base metal value of 28.1%. An observation of great interest was that the weld surface condition did not have any effect on the ductility of the 5754–O aluminium alloy studied in the present investigation.
机译:最近颁布了联邦法规以显着减少由机动车辆引起的大气污染。这迫使汽车制造商通过使用轻质材料(例如铝)来提高汽车和轻型卡车的燃油效率。当前工作的重点是为5754-O铝合金的自生CO 2 (连续模式)和Nd-YAG(连续模式)激光束焊接开发焊接程序。使用拉伸试验,显微硬度试验,光学显微镜和化学分析评估了焊接接头的机械和微观结构特征。结果表明,该合金可以自熔激光焊接,具有全熔透性,最小的表面不连续性,并且通过熔化区的汽化而损失的镁很少(如果有的话)。使用5 kW CO 2 和3 kW连续波(CW)Nd-YAG产生的5754-O激光焊接的纵向总延伸率(所有焊缝金属)随着行进速度的提高而略有下降。研究表明,这种下降趋势可能是由于晶粒相对于加载方向的取向所致。使用5 kW CO 2 激光以127至212 mm s -1 的行进速度生产的焊缝,其总纵向伸长率为19.13–15.12%,而使用碳纳米管生产的焊缝3 kW CW Nd–YAG激光在85至148 mm s s -1 之间的传播速度下显示总纵向伸长率为22.6-18.15%,而贱金属值为28.1%。令人非常感兴趣的观察是,焊接表面状况对本研究中研究的5754–O铝合金的延展性没有任何影响。

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  • 来源
    《Science and Technology of Welding & Joining》 |2001年第3期|182-190|共9页
  • 作者

    Ramasamy S.; Albright C.E.;

  • 作者单位

    Emhart Automotive, PO Box 868, Mount Clemens, MI 48046, USA. siva.ramasamy@bdk.com;

    The Ohio State University, 1250 Arthur E. Adams Drive, Columbus, OH 43221, USA;

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