Mechanisms of joint and microstructure formation in high power ultrasonic spot welding 6111 aluminium automotive sheet
Mechanisms of joint and microstructure formation in high power ultrasonic spot welding 6111 aluminium automotive sheet
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DOI：
10.1016/j.msea.2010.06.038
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发表时间：
2010-09-15
期刊：
影响因子：
6.4
通讯作者：
Prangnell, P. B.
中科院分区：
文献类型：
--
作者：
Bakavos, D.;Prangnell, P. B.
电阻点焊（RSW）很难应用于汽车铝合金。大功率超声点焊是一种新型的焊接方法，其焊接效率极高，焊接能量仅为点焊的2%。然而，到目前为止，很少有研究的键形成的机制和材料的相互作用，发生在这个过程中。在这里，我们报告了一个详细的调查，我们已经使用X射线断层扫描，高分辨率扫描电镜，EBSD，和异种合金焊缝，跟踪界面位置和焊缝形成的阶段，和微观结构的演变，作为焊接能量的函数。在最佳条件下，生产出高质量的焊缝，几乎没有缺陷。焊接通过微焊缝的发展和扩展进行，直到在焊接区域内发生广泛的塑性变形，其中温度达到类似于380摄氏度。探讨了高压超声波焊接界面流动特征的成因。(C)2010 Elsevier B.V.保留所有权利。
Resistance spot welding (RSW) is difficult to apply to aluminium automotive alloys. High power ultrasonic spot welding (HP-USW) is a new alternative method which is extremely efficient, using similar to 2% of the energy of RSW. However, to date there have been few studies of the mechanisms of bond formation and the material interactions that take place with this process. Here, we report on a detailed investigation where we have used X-ray tomography, high resolution SEM, and EBSD, and dissimilar alloy welds, to track the interface position and characterise the stages of weld formation, and microstructure evolution, as a function of welding energy. Under optimum conditions high quality welds are produced, showing few defects. Welding proceeds by the development and spread of microwelds, until extensive plastic deformation occurs within the weld zone, where the temperature reaches similar to 380 degrees C. The origin of the weld interface 'flow features' characteristic of HP-USW are discussed. (C) 2010 Elsevier B.V. All rights reserved.