Outline

  • Abstract
  • Keywords
  • 1. Introduction
  • 2. Background
  • 2.1. Cooling Rate Effect
  • 2.2. Silicon Effect
  • 3. Experimental
  • 4. Results and Discussion
  • 4.1. Comparison of Cooling Rates
  • 4.2. Cast Microstructure
  • 4.3. Weld Metal Microstructure
  • 4.4. Weld Thermal Analysis
  • 5. Conclusion
  • Acknowledgements
  • References

رئوس مطالب

  • چکیده
  • مقدمه
  • 2. پیش زمینه
  • 2.1. تاثیر نرخ سرد سازی
  • 2.2. تاثیر سیلیکون
  • 3. کارهای تجربی
  • 4. نتایج و توضیحات
  • 4.1. مقایسه نرخ های سرمایش
  • 4.2. ریز ساختار ریختگی
  • 4.3. ریزساختار فلز جوش
  • 4.4. آنالیز حرارتی جوش
  • 5. جمع بندی
  • تشکر

Abstract

Weld metal microstructure for alloy 6060 aluminum welds, made using the gas-tungsten arc process and alloy 4043 filler metal, has been characterized using optical metallography, EPMA microprobe analysis, SEM/EBSD and STEM/EDX electron microscopy, and single-sensor differential thermal analysis (SS-DTA). In addition, alloy 6060 castings were solidified at variable cooling rates approaching that of welding, to provide a reference for comparison with weld microstructure. It was found that a major change in cast microstructure occurs at cooling rates higher than 27 K/s resulting in a structure similar to that observed in weld metal. Rapid cooling is believed to favor low temperature solidification reactions that normally would be achieved only at higher silicon content. Accordingly, additions of 4043 filler metal that increase the weld metal silicon content have only limited affect on weld solidification range and microstructure. This has direct implications regarding how 4043 filler additions improve weldability and weld quality.

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