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Mechanisms of joint and microstructure formation in high power ultrasonic spot welding 6111 aluminium automotive sheet

机译:大功率超声点焊6111铝质汽车板的接头和组织形成机理

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摘要

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 ~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 ~380 ℃ The origin of the weld interface 'flow features' characteristic of HP-USW are discussed.
机译:电阻点焊(RSW)很难应用于汽车铝合金。高功率超声波点焊(HP-USW)是一种新的替代方法,它使用RSW能量的约2%效率极高。然而,迄今为止,很少有关于该过程中键形成机理和材料相互作用的研究。在这里,我们报告了一项详细的调查,其中我们使用了X射线断层扫描,高分辨率SEM和EBSD以及异种合金焊缝,以跟踪界面位置并表征焊缝形成和微观组织演变的阶段,这些函数是焊接能量。在最佳条件下,可以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散而进行,直到温度达到380℃的焊接区域内发生大范围的塑性变形。讨论了HP-USW的焊接界面“流动特征”的起源。

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