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The Mechanism of Ultrasonic Vibration on Grain Refining and Degassing in GTA Spot Welding of Copper Joints

机译:超声振动对铜接头GTA点焊中晶粒细化和脱气的作用机理

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摘要

This paper examines the effect of ultrasonic vibration (USV) on grain size and interrupted porosity in Gas Tungsten Arc (GTA) spot-welded copper. Grain size was refined by perpendicularly attaching a transducer to the welded sheet and applying USV to the weld pool for a short time (0, 2, 4, and 6 s) in addition improvements to the degassing process. Results illustrate a significant reduction of grain size (57%). Notably, USV provided interaction between reformations (fragmentation) and provided nucleation points (detaching particles from the fusion line) for grains in the nugget zone and the elimination of porosity in the nugget zone. The GTA spot welding process, in conjunction with USV, demonstrated an improvement in the corrosion potential for a copper spot-welded joint in comparison to the joint welded without assistance of USV. Finally, welding of copper by GTA spot welding in conjunction with ultrasound for 2 s presented significant mechanical properties.
机译:本文研究了超声振动(USV)对钨极电弧(GTA)点焊铜的晶粒尺寸和中断气孔的影响。通过在短时间内(0、2、4和6 s)将换能器垂直安装在焊接板上并在焊池中施加USV,可以改善晶粒尺寸,从而改善除气工艺。结果表明晶粒尺寸显着减小(57%)。值得注意的是,USV提供了重整(碎片化)之间的相互作用,并提供了金块区域中晶粒的成核点(从熔合线分离颗粒),并消除了金块区域中的孔隙。与不使用USV进行焊接的接头相比,GTA点焊工艺结合USV证明了铜点焊接头的腐蚀潜力得到了改善。最后,通过GTA点焊结合超声2秒钟进行铜焊接,呈现出显着的机械性能。

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